Isoenzymes are different molecular forms of the same enzyme and five major lactate dehydrogenase (LDH) isoenzymes are found in vertebrate tissues. The amounts of the isoenzymes vary in a tissue specific manner and these differences can be readily detected by localizing LDH activity in an agarose gel after electrophoresis of tissue extracts. In this exercise, students prepare a tissue extract from calf thymus and then compare the LDH isoenzyme profile to those from calf serum, heart and muscle.. ...
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The species of origin of animal cell lines is determined or confirmed by isoenzyme analysis (AuthentiKit TM System, Innovative Chemistry). The electrophoretic mobility of at least two different isoenzymes from a panel of seven (AST, G6PD, LD, MD, MPI, NP, and Pep B) is determined for each cell line. Recently, Banca Biologica has published a PCR-based method for easily identifying or confirming the species of origin of cell lines by using a panel of oligonucleotides specific for the nine animal species most common in cell culture laboratories (human, cat, dog, mouse, rat, horse, rabbit, African Green monkey and Chinese hamster). Furthermore Banca Biologica has developed a multiplex PCR method, which allow for confirmation of the species of a cell line and for identification of a possible inter-species cross-contamination by a single assay ...
Earlier studies from our laboratory indicated that lowering the expression of PDK1 has a pronounced effect on tumorigenesis of PTEN+/− mice (Bayascas et al., 2005). Reduction in levels of PDK1 expression is likely to impact on the activity of multiple downstream targets of PDK1. However, the only major signalling defect we observed in the PDK1K465E/K465EPTEN+/− mice was a moderate reduction of Akt T308 phosphorylation, which reduces Akt isoform activity. All other AGC kinases we have studied, including S6K1 and SGK activity (as judged by phosphorylation of NDRG1), are not affected in the tumours that develop in the PDK1K465E/K465EPTEN+/− mice. This indicates that a moderate reduction in Akt isoform activity is sufficient to delay tumour onset and development. The mechanism by which reduction in Akt activity delays tumour onset and development requires further investigation because phosphorylation of the Akt substrates we have investigated is not markedly inhibited in tumours derived from ...
The relation between growth of gall and larva of S.pyrigolla was studied by observing the growth of the gall.The isoenzyme pattern and the activity of hydrogen peroxidase were analysed.The activity of certain chemical substance in larvas saliva gland was verified.The growth of gall was considered to be related to the stimulation of the larvas eating activity.
isozyme) n. a physically distinct form of a given enzyme. Isoenzymes catalyse the same type of reaction but have slight physical and immunological differences. Isoenzymes of dehydrogenases, oxidases, transaminases, phosphatases, and proteolytic enzymes are known to exist. ...
Translocation of these novel PKC isoenzymes occurred significantly more slowly than either eGFP-PKCα or Ca2+, with t10-90 times in the range 25-30 s. Translocation of the DAG sensor (eGFP-C12) occurred with a similar time course which, together with the lack of requirement for an elevation of [Ca2+]i (Fig. 6), suggests that translocation of both eGFP-PKCδ and eGFP-PKCε is predominantly driven by changes in DAG. This is consistent with the dogma that nPKCs are DAG sensitive and Ca2+ insensitive. However, our experiments using BAPTA to annul changes in [Ca2+]i revealed additional complexity. eGFP-PKCδ translocated more rapidly in BAPTA-loaded cells and at the peak of the response a greater proportion of eGFP-PKCδ had translocated to the membrane. However, the total translocation during the response was similar in the presence or absence of BAPTA, suggesting that eGFP-PKCδ translocated more quickly, but not to a greater degree, in the absence of a Ca2+ response. It seems unlikely that this ...
The lactate dehydrogenase isoenzyme pattern of human lymphocitic cells has been determined in several people before and after stimulation by mitogenic lectins at different times after the start of the culture. A very significant change take place in the LDH 5 which can reach a greater concentration towards the other isoenzymes at the 72 h from the mitogenic stimulus, even if it starts from a smaller concentration.
definition of HLDH5, what does HLDH5 mean?, meaning of HLDH5, Human Lactate Dehydrogenase Isoenzyme 5, HLDH5 stands for Human Lactate Dehydrogenase Isoenzyme 5
Total lactate dehydrogenase (LDH; EC 1.1.1.27) activity and the percentage distribution of LDH isoenzymes were determined in 127 patients with malignant diseases. A shift in the isoenzyme patterns was observed toward the M-type, with an increase in the percentage of LDH-4 and LDH-5 isoenzymes and a slight increase in total LDH activity of all patients. Serum samples from 68 of the patients contained an abnormal isoenzyme of LDH, LDH-1 ex, that, on agarose gel electrophoresis at pH 8.6, migrated between albumin and LDH-1 isoenzyme. Chemotherapy, radiotherapy, or surgical removal of the tumor was accompanied by disappearance of this abnormal isoenzyme. The heat stability of LDH-1 ex isoenzyme appears to be similar to that of LDH-1 but greater than that of the other LDH isoenzymes. Statistical analysis of these data demonstrated a significant correlation between malignancy and the appearance of LDH-1 ex isoenzyme (P less than 0.001). In contrast, the relationship between LDH-1 ex isoenzyme and metastasis
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Lactate dehydrogenase (LDH) isoenzymes are required for adenosine triphosphate production, with each of five different isoenzymes having varying proficiencies in anaerobic versus aerobic environments. With advancing pregnancy, the isoenzyme profile in uterine muscle shifts toward a more anaerobic profile, speculatively to facilitate uterine efficiency during periods of low oxygen that accompany labor contractions. Profile shifting may even occur throughout labor. Maternal serum LDH levels between 24-48 hours following delivery predominantly originate from uterine muscle, reflecting the enzymatic state of the myometrium during labor. Our purpose was to describe serum LDH isoenzymes 24-30 hours post-delivery to determine if cervical dilation rates following labor admission were associated with a particular LDH profile. We also compared differences in post-delivery LDH isoenzyme profiles between women admitted in pre-active versus established active labor. Low-risk, nulliparous women with spontaneous labor
• The concentration of creatine kinase BB isoenzyme (CK BB) was measured by radioimmunoassay in CSF from 306 patients with various neurologic disorders. Levels
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Buy our Recombinant human Lactate Dehydrogenase B protein. Ab96765 is an active full length protein produced in Escherichia coli and has been validated in…
TY - JOUR. T1 - Chromatinized Protein Kinase C-theta: Can It Escape the Clutches of NF-kB?. AU - Sutcliffe, Elissa. AU - Li, Jasmine. AU - Zafar, Anjum. AU - Hardy, Kristine. AU - Ghildyal, Reena. AU - Norris, Nicole. AU - Lim, Chloe (Pek Siew). AU - Milburn, Peter. AU - Casarotto, Marco. AU - Denyer, Gareth. AU - Rao, Sudha. PY - 2012. Y1 - 2012. N2 - We recently provided the first description of a nuclear mechanism used by Protein Kinase C-theta (PKC-θ) to mediate T cell gene expression. In this mode, PKC-θ tethers to chromatin to form an active nuclear complex by interacting with proteins including RNA polymerase II, the histone kinase MSK-1, the demethylase LSD1, and the adaptor molecule 14-3-3ζ at regulatory regions of inducible immune response genes. Moreover, our genome-wide analysis identified many novel PKC-θ target genes and microRNAs implicated in T cell development, differentiation, apoptosis, and proliferation. We have expanded our ChIP-on-chip analysis and have now identified a ...
TY - JOUR. T1 - Inhibition of the spontaneous rate of contraction of neonatal cardiac myocytes by protein kinase C isozymes. T2 - A putative role for the ε isozyme. AU - Johnson, John A. AU - Mochly-Rosen, Daria. PY - 1995/1/1. Y1 - 1995/1/1. N2 - Protein kinase C (PKC) enzymes regulate numerous cardiac functions. In the present study, we determined the effects of the PKC-activating drug 4-β phorbol 12-myristate 13-acetate (4-β PMA) on the rate of contraction and correlated these changes with the distribution and levels of α-, β-, δ-, ε-, and ζ-PKC isozymes by using neonatal rat cardiac myocytes in culture. Treatment with 0.3 to 100 nmol/L 4-β PMA caused negative chronotropic effects on contraction. This effect was maximal at a concentration of 3 nmol/L 4-β PMA and correlated with redistribution of the α- and ε-PKC isozymes from the cytosolic to the particulate cell fraction. After a 1-hour treatment with 100 nmol/L PMA, the α- and β-PKC isozymes and an 80-kD ζ- like PKC isozyme ...
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Protein Kinase C Theta Type (nPKC Theta or PRKCQ or EC 2.7.11.13) - Pipeline Review, H1 2017 Size and Share Published in 2017-05-30 Available for US$ 3500 at Researchmoz.us
Alkaline Phosphatase Isoenzymes High Resolution Titan gel in vendita filippine olx Immunofixation Immunoelectrophoresis The alkaline phosphatase ALP isoenzymes found in human serum originate from several sources with the greatest activity occurring in the bone, liver, intestine, and placenta. Because of wide distribution of alkaline phosphatase in tissue, limited information can be obtained from a total ALP assay. Fortunately, the tissue sources of elevated ALP in serum can be determined by identifying the isoenzyme.. The isoenzymes of alkaline phosphatase are unique in that some organs have only one major isoenzyme rather than multiple isoenzyme forms. The isoenzymes of ALP differ in their physicochemical and electrophoretic properties, and it is by taking advantage of these differences that individual isoenzymes can be titan gel in vendita filippine olx. In addition to the liver, bone, intestinal and placental isoenzymes, macrohepatic, Regan, PA, Nagao, and renal isoenzymes have also been ...
Superoxide dismutase (SOD) isoenzymes are essential for scavenging excess reactive oxygen species in living organisms. So far, expression pattern of SOD isoenzymes genes along leaf development plus their sub-cellular localization and physical interaction network have not yet been clearly elucidated. Using multiple bioinformatics tools, we predicted the sub-cellular localizations of SOD isoforms and described their physical interactions in rice. Using in silico approaches, we obtained several evidences for existence of seven SOD genes and a SOD copper chaperone gene. Their transcripts were differentially expressed along with different developmental stage of rice leaf. Finally, we performed quantitative real time-polymerase chain reaction (qRT-PCR) to validate in silico differential expression pattern of SOD genes experimentally. Expression of two cytosolic cCuZn-SODs was high during the whole vegetative stage. Two plastidic Fe-SODs were found and their expression levels were very low and started ...
Define Isoenzymes. Isoenzymes synonyms, Isoenzymes pronunciation, Isoenzymes translation, English dictionary definition of Isoenzymes. n. Any of several forms of an enzyme that catalyze the same reaction but differ in chemical structure. Also called isozyme . i′so·en·zy′mic adj.
Creatine kinase (CK) isoenzymes are essential for storing, buffering and intracellular transport of "energy-rich" phosphate compounds in tissues with fluctuating high energy demand such as muscle, brain and other tissues and cells where Creatine Kinase CK is expressed. Using dividing HeLa cells, we report here for the first time that GM130 and Creatine Kinase BB isoenzyme BB-CK co-localize specifically in a transient fashion during early prophase of mitosis, when GM130 plays an important role in Golgi fragmentation that starts also at early prophase. These data may shed new light on CK BB Isoenzyme BB-CK function for energy provision for Golgi-fragmentation that is initiated by cell signalling cascades in the early phases of mitosis. source ...
TY - JOUR. T1 - The Nrf2 transcription factor regulates basal expression of class alpha and class Mu glutathione S-transferases in the mouse, but not necessarily their induction by cancer chemopreventive agents. AU - McMaghon, Michale. AU - Chanas, Simon A.. AU - Henderson, Colin J.. AU - Wolf, C. Roland. AU - Yamamoto, Masayuki. AU - Hayes, John D.. PY - 2001/2/28. Y1 - 2001/2/28. N2 - Nrf2 controls the basal expression of genes regulated through the antioxidant responsive element (ARF). It also contributes to the inducible expression of certain members of the ARE-gene battery. Under normal dietary conditions, the expression of class Alpha and class Mu glutathione S-transferase (GST) isoenzymes and NAD(P)H:quinone oxidoreductase (NQO) in the liver and small intestine is reduced significantly in nrf 2 (-/-) mice. Administration of chemopreventive agents to wildtype mice can result in marked induction of hepatic and intestinal GST and NQO. However, the extent of induction of these detoxication ...
Studies have also advised the reduction of PKC theta expression may be responsible for inhibition of kit expression in GISTs, hence isnt going to react to KIT staining. Protein kinase C theta kinase inhibitor library for screening is really a novel protein kinase, downstream eector while in the kit signaling process that is associated with T cell activation, signal trans duction, and neuronal dierentiation. Various scientific studies have shown that PKC theta is strongly expressed and is overexpressed in GISTs, but not in other sarcomas. These scientific studies established PKC theta being a diagnostic marker for GIST. In study conducted by kim et al. on 220 GIST tumors, 212 had been positive to PKC theta while KIT was constructive in 216. However, two samples which can be PKC theta good and KIT adverse showed mutation in PDGFRA, indicating that PKC theta may possibly be a practical marker in diagnosing KIT damaging PDGFRA mutation tumors.. Whilst, other investigators feel that PKC theta ...
It is commonly assumed that creatine kinase (CK) activity in plasma is related to a state of an inflammatory response in 24-48 h and also has shown
Anti-Lactate Dehydrogenase Isoenzyme V antibody (ab9002) has been cited in 20 publications. References for Human, Mouse in IHC, IHC-Fr, IHC-P, WB
TLR ligands act directly upon T cells to restore proliferation in the absence of protein kinase C-theta signaling and promote autoimmune ...
The objective of the present work consisted on determining the effects of PTS and Pyk isozymes inactivation on cell physiology, metabolic flux distribution and PEP availability for aromatics biosynthesis. The inactivation of PTS in E. coli abolishes PEP-dependent glucose transport; therefore PYR production from PEP is dependent only on Pyk isozyme activities. In this study, by inactivating each Pyk isozyme in a PTS- glc+ background, strains were generated where the PEP to PYR reaction was dependent only on PykA or PykF activity. These strains were characterized by flux analysis, thus providing the first quantitative description of the metabolic consequences of the sequential elimination of activities catalyzing the PEP to PYR reaction.. The inactivation of PTS in E. coli causes a strong reduction in qGlc and μ, therefore, such mutant strains display a PTS- glc- phenotype. To improve qGlc and μ, strain VH33 has a chromosomal modification that increases its capacity for non PTS-dependent glucose ...
Total Lactate Dehydrogenase (LD):. LD activity is present in all cells of the body with highest concentrations in heart, liver, muscle, kidney, lung, and erythrocytes. As with other proteins used as tissue-function markers, the appearance of LD in the serum occurs only after prolonged hypoxia and is elevated in a number of clinical conditions including cardiorespiratory diseases, malignancy, hemolysis, and disorders of the liver, kidneys, lung, and muscle.. Isoenzymes:. LD is a tetrameric cytoplasmic enzyme, composed of H and M subunits. The usual designation of the isoenzyme is LD-I (H4), LD-II (H3M), LD-III (H2M2), LD-IV (HM3), and LD-V (M4). Tissue specificity is derived from the fact that tissue-specific synthesis of subunits occurs in well-defined ratios. Most notably, heart muscle cells preferentially synthesize H subunits, while liver cells synthesize M subunits nearly exclusively. Skeletal muscle also synthesizes largely M subunits so that LD-V is both a liver and skeletal muscle form of ...
In the dog, creatine kinase (CK) is mostly present in the skeletal muscles, myocardium, brain and intestine. The MM isoenzyme predominates in muscles and myocardium. In plasma, reference values depend on the technique used and CK-MB accounts for about 30-45% of total CK activity. Sex has no influence on plasma CK activity, which is higher in young dogs than in adults. Plasma CK is elevated after physical exercise. After its release from the cells, CK reaches the plasma mostly via the lymphatic route and then remains in the plasma compartment. It is rapidly cleared with a half-life of about 2 hours. Muscle diseases are the main source of plasma CK elevations: inherited myopathies, malignant hyperthermia, hypothyroidism, vitamin E-selenium deficiency, prolonged decubitus, intramuscular injections, surgery, etc. Plasma CK is also increased in experimental myocardial infarction, for which the dog is an interesting model, allowing quantification of the damage by measuring the total CK activity ...
LACTATE DEHYDROGENASE (LD). 1-30 days: 135-750 U/L. 31 days-11 months: 180-435 U/L. 1-3 years: 160-370 U/L. 4-6 years: 145-345 U/L. 7-9 years: 143-290 U/L. 10-12 years: 120-293 U/L. 13-15 years: 110-283 U/L. 16-17 years: 105-233 U/L. ≥18 years: 122-222 U/L. LD ISOENZYMES. I (fast band): 17.5-28.3%. II: 30.4-36.4%. III: 19.2-24.8%. IV: 9.6-15.6%. V (slow band): 5.5-12.7%. ...
Ovariectomy fails to modify the cardiac myosin isoenzyme profile of adult rats.: Estrogen has been shown to help maintain the elevated expression of the high AT
TY - JOUR. T1 - Structural Determinants of Isoform Selectivity in PI3K Inhibitors. AU - Miller, Michelle S.. AU - Thompson, Philip E.. AU - Gabelli, Sandra B. PY - 2019/2/26. Y1 - 2019/2/26. N2 - Phosphatidylinositol 3-kinases (PI3Ks) are important therapeutic targets for the treatment of cancer, thrombosis, and inflammatory and immune diseases. The four highly homologous Class I isoforms, PI3K, PI3K, PI3K and PI3K have unique, non-redundant physiological roles and as such, isoform selectivity has been a key consideration driving inhibitor design and development. In this review, we discuss the structural biology of PI3Ks and how our growing knowledge of structure has influenced the medicinal chemistry of PI3K inhibitors. We present an analysis of the available structure-selectivity-activity relationship data to highlight key insights into how the various regions of the PI3K binding site influence isoform selectivity. The picture that emerges is one that is far from simple and emphasizes the ...
Calcium-independent, phospholipid- and diacylglycerol (DAG)-dependent serine/threonine-protein kinase that mediates non-redundant functions in T-cell receptor (TCR) signaling, including T-cells activation, proliferation, differentiation and survival, by mediating activation of multiple transcription factors such as NF-kappa-B, JUN, NFATC1 and NFATC2. In TCR-CD3/CD28-co-stimulated T-cells, is required for the activation of NF-kappa-B and JUN, which in turn are essential for IL2 production, and participates in the calcium-dependent NFATC1 and NFATC2 transactivation. Mediates the activation of the canonical NF-kappa-B pathway (NFKB1) by direct phosphorylation of CARD11 on several serine residues, inducing CARD11 association with lipid rafts and recruitment of the BCL10-MALT1 complex, which then activates IKK complex, resulting in nuclear translocation and activation of NFKB1. May also play an indirect role in activation of the non-canonical NF-kappa-B (NFKB2) pathway. In the signaling pathway leading to
Lymphocytes. Lactic dehydrogenase isoenzymes. Total LDH is actually a group of enzymes. The individual enzymes (isoenzymes) that make up total LDH have different concentrations in different tissues. Therefore, the tissue responsible for an elevated total LDH value may often be identified by fractionation (separation) and measurement of individual isoenzymes. In addition, since the population normal range for total LDH is rather wide, abnormal elevation of one isoenzyme may occur without lifting total LDH out of the total LDH normal range.. Five main fractions (isoenzymes) of LDH are measured. With use of the standard international nomenclature (early U.S. investigators used opposite terminology), fraction 1 is found mainly in RBCs and in heart and kidney, fraction 3 comes from lung, and fraction 5 is located predominantly in liver and to a lesser extent in skeletal muscle. Skeletal muscle contains some percentage of all the fractions, although fraction 5 predominates. Various methods of ...
CK is a dimeric enzyme. There are two common gene products, one coding for the subunit (so named because of its predominance in muscle) and the other for the B subunit (so named because of its predominance in brain tissue). The three common forms of active CK include two homodimers and one heterodimer. The first homodimer (CK-1) consists of two B subunits and is referred to as CKBB. The other has two M subunits and is referred to as CKMM (CK-3). The heterodimer has one of each subunit and is referred to as CKMB (CK-2)2. The specificity of CKMB for cardiac tissue is what has made it such a powerful diagnostic tool for the diagnosis of acute myocardial infarction (AMI). There is a third gene product which results in the mitochondrial form of CK.. Along with CKMB, significant levels of CKMM activity are found in cardiac muscle and therefore a large increase in total CK was once used as a tool in the diagnosis of AMI3. Once the CK isoenzymes were elucidated and isoenzyme tests became available, CKMB ...
Protein Kinase C (PKC) is a family of serine/threonine kinases that are involved in almost every signal transduction pathway. Their regulation is mediated by several factors and by binding to a group of scaffolding proteins called RACKs (Adams et al. 2011). The development of PKC modulators with anti-cancer therapeutic value is a major target in cancer. However, this task is made difficult because PKC has an important role to play in normal processes and the PKC family consists of at least 12 different isozymes. In colon cancer, there is differential expression of the PKC isozymes, giving the cancer cells a migratory advantage and thus promote cancer progression. Our hypothesis is that PKC expression, activity and localisation are altered as colon epithelial cells switch from normal to the transformed state. We are confident that being able to recognise these changes has the potential to be used as a biomarker and prognostic marker in the early detection of colon cancer. Using novel 3D culture ...
Creatine Kinase and Isoenzymes answers are found in the Daviss Lab & Diagnostic Tests powered by Unbound Medicine. Available for iPhone, iPad, Android, and Web.
PKC gamma, 0.1 ml. PKC gamma is an 80 kDa member of the conventional group (cPKCs: sensitive to calcium, diacylglycerol and phorbol esters) of the PKC family of serine/threonine family kinases that are involved in a wide range of physiological processes
Protein kinases C (PKCs) are ubiquitously expressed and play critical roles in a plethora of physiological and pathophysiological processes. Owing to PKCs highly conserved phosphorylation consensus sequence, it has been difficult to distinguish the role of individual PKC isoforms. Recently, the identification of novel membrane targeting via subcellularly targeted diacylglycerol production found for novel PKCs (nPKCs), together with a characterization of their putative functions, has shed new light on the specific roles of individual PKCs in cellular processes. ...
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Isozymes (also known as isoenzymes or more generally as multiple forms of enzymes) are enzymes that differ in amino acid sequence but catalyze the same chemical reaction. These enzymes usually display different kinetic parameters (e.g. different KM values), or different regulatory properties. The existence of isozymes permits the fine-tuning of metabolism to meet the particular needs of a given tissue or developmental stage (for example lactate dehydrogenase (LDH)). In biochemistry, isozymes (or isoenzymes) are isoforms (closely related variants) of enzymes. In many cases, they are coded for by homologous genes that have diverged over time. Although, strictly speaking, allozymes represent enzymes from different alleles of the same gene, and isozymes represent enzymes from different genes that process or catalyse the same reaction, the two words are usually used interchangeably. Isozymes were first described by R. L. Hunter and Clement Markert (1957) who defined them as different variants of the ...
LDHA - LDHA (untagged)-Human lactate dehydrogenase A (LDHA), transcript variant 1 available for purchase from OriGene - Your Gene Company.
ZANONI, Thalita Boldrin; LIZIER, Thiago M.; ASSIS, Marilda das Dores; ZANONI, Maria Valnice B.; OLIVEIRA, Danielle Palma de. CYP-450 isoenzymes catalyze the generation of hazardous aromatic amines after reaction with the azo dye Sudan III. Food and Chemical Toxicology, Kidlington, v. 57, p. 217-226, 2013. Disponível em: < http://dx.doi.org/10.1016/j.fct.2013.03.035 > DOI: 10.1016/j.fct.2013.03.035 ...
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TY - JOUR. T1 - Distribution of isoenzymes of the glycogenolytic cascade in different types of muscle fibre. AU - Burchell, Ann. AU - Cohen, Patricia T.W.. AU - Cohen, Philip. PY - 1976/8/1. Y1 - 1976/8/1. UR - http://www.scopus.com/inward/record.url?scp=0017196402&partnerID=8YFLogxK. U2 - 10.1016/0014-5793(76)80861-7. DO - 10.1016/0014-5793(76)80861-7. M3 - Article. C2 - 1066284. AN - SCOPUS:0017196402. VL - 67. SP - 17. EP - 22. JO - FEBS Letters. JF - FEBS Letters. SN - 0014-5793. IS - 1. ER - ...
PKC zeta (phospho Thr560) antibody (protein kinase C, zeta) for WB. Anti-PKC zeta (phospho Thr560) pAb (GTX130426) is tested in Human samples. 100% Ab-Assurance.
PKC delta (phospho Tyr52) antibody (protein kinase C, delta) for WB. Anti-PKC delta (phospho Tyr52) pAb (GTX55112) is tested in Human, Mouse, Rat samples. 100% Ab-Assurance.
Larry, I am a bit confused by the your criticisms and by figures you put in this essay. Specifically, you seem to be saying that these studies (at least two of them - the Cell paper is infuriating in the way it hides, or does not make available, most of the information and results most people would like to see) suggest that cultured cells can make do without core metabolic pathways. However, in the two figures you show, it looks like the relevant enzymes are encoded by gene families. I would take home from this the likelihood that purported cell- or tissue- specific genes and enzyme isoforms are not so specific, such that knock-downs or knock-outs of most of the individual genes involved have little effect because other genes can pick up the slack, so to speak ...