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Topic: Isozymes

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	Isozyme - Wikipedia, the free encyclopedia
		Isozymes (also known as isoenzymes) are enzymes that differ in amino acid sequence but catalyze the same chemical reaction.
		An example of an isozyme is glucokinase, a variant of hexokinase which is not inhibited by glucose 6-phosphate.
		To identify isozymes, a crude protein extract is made by grinding animal or plant tissue with an extraction buffer, and the components of extract are separated according to their charge by gel electrophoresis.
	en.wikipedia.org /wiki/Isozyme (970 words)

	Selected isozymes of PKC contribute to augmented growth of fetal and neonatal bovine PA adventitial fibroblasts -- Das ...
		, and -µ isozymes in the absence (
		II isozymes of PKC contribute to the augmented growth of immature bovine PA adventitial fibroblasts.
		Differential susceptibility of PKC isozymes in PA adventitial fibroblasts to PMA-induced downregulation.
	ajplung.physiology.org /cgi/content/full/273/6/L1276 (5004 words)

	Multiple forms of Enzymes
		The 1964 report (1) recommended that individual isoenzymes (isozymes) should be distinguished and numbered on the basis of electrophoretic mobility, with the number 1 being assigned to that form having the highest mobility toward the anode.
		Isozymes (isoenzymes) or their subunits should not be labeled on the basis of tissue distribution (e.g.
		In naming isozymes (isoenzymes), the normal enzyme name (either systematic or trivial) (3) should be used, followed by a number.
	www.chem.qmul.ac.uk /iubmb/misc/isoen.html (1849 words)

	Biotechnology in forest tree improvement with special references to developing countries
		In isozyme analyses, the particular enzyme is extracted from the plant tissue, and the different forms separated by gel electrophoresis, on the basis of molecular size, shape and electrical charge.
		The results of many isozyme studies lead to the conclusion that interpopulation variation is of little significance, in comparison with intrapopulation variation, and therefore need not be considered in gene conservation and breeding programmes.
		Isozyme studies suggest that animal dispersal may be moving seeds over relatively large distances in tropical forests, thus reducing population genetic differentiation (Loveless 1992).
	www.fao.org /docrep/006/t2114e/T2114E05.htm (8096 words)

	BIOMEDICAL TOPICS (Site not responding. Last check: 2007-10-25)
		Isozymes are highly homologous to each other but contain small differences in amino acid sequence.
		The term isozyme is not a precise one and can refer to different gene products, or different products of the same gene with alternative splicing.
		In Pyruvate Kinase Deficiency, for example, the isozyme found in the red blood cell is deficient (PK I).
	www.hscbklyn.edu /SUNY/Biochem/BioModules/Bkgnd_Isozym.html (268 words)

	[No title] (Site not responding. Last check: 2007-10-25)
		comparative studies of ldh isozymes within the erythrocyte from various vertebrate species demonstrated a marked species variation in the number of ldh isozymes, in the distribution of total ldh activity among them, and in their electrophoretic mobilities.
		during development of chick, rabbit, and human tissues characteristic sequential alterations in the ldh isozyme pattern occurred and consisted for liver and muscle in loss of the most rapidly migrating anodal bands and increased activity in the cathodal bands and slower migrating anodal bands.
		the shift toward prominence of cathodal isozymes during both fetal development and tissue culture can be explained by postulating the increased activity of the gene producing one of the subunits of ldh with a concomitant decrease in the activity of the gene producing the second subunit.
	www.cs.utexas.edu /ftp/pub/inderjit/Data/Text/med/0.205 (289 words)

	Changes in cardiac protein kinase C activities and isozymes in streptozotocin-induced diabetes -- Liu et al. 277 (5): ...
		- isozymes in the homogenate, cytosolic, and particulate
		Increased protein kinase C and isozyme redistribution in pressure-overload cardiac hypertrophy in the rat.
		Activation of the zeta isozyme of protein kinase C by phosphatidylinositol 3,4,5-trisphosphate.
	ajpendo.physiology.org /cgi/content/full/277/5/E798 (4649 words)

	Acid phosphatase isozymes in root, coleoptile and callus tissues of inbreds and their hybrids (Site not responding. Last check: 2007-10-25)
		Isozymes of acid phosphatase were studied under different developmental stages, such as root and coleoptile, in vivo and at the callus stage in vitro in 5 inbreds, Tuxp162-1, Tuxp237-2, Tuxp104-2, MS1DR-120, PKMS1-49, and 4 hybrid genotypes, Tuxp162-1xTuxp237-2, Tuxp237-2xTuxp124-1, Tuxp104-2xTuxp46-6, MS1DR-120xPKMS1-49.
		Isozyme pattern of root tissues in the inbreds MS1DR-120, PKMS1-49 and their hybrid differed in bands as well as in the intensity of identical bands.
		A marked difference in the isozyme number and mobility in calli compared to their callusing explant and nonavailability of band A-8 in in vitro tissues was due to activation of an otherwise normally repressed locus due to genotype x tissue culture interactions.
	www.maizegdb.org /mnl/66/146kumar.html (436 words)

	KAI Pharmaceuticals - Science & Programs (Site not responding. Last check: 2007-10-25)
		Protein kinase C (PKC) is a family of closely related enzymes, or isozymes, that participate in a number of different biological processes, and abnormal PKC signaling has been associated with various diseases.
		Several PKC isozymes are expressed in each and every cell in the body and each isozyme performs unique functions.
		However, because each of these isozymes are so similar, previous attempts to develop therapeutics that modulate a specific PKC isozyme have been hindered by a lack of selectivity.
	www.kaipharmaceuticals.com /assets/sciencePKC.html (174 words)

	Determination of the Specific Substrate Sequence Motifs of Protein Kinase C Isozymes -- Nishikawa et al. 272 (2): 952 ...
		The results obtained for other PKC isozymes are summarized in Table I.
		isozyme (pseudo.) are presented by the one-letter codes, respectively.
		The optimal substrates predicted for the various PKC isozymes are in good agreement with known substrates.
	www.jbc.org /cgi/content/full/272/2/952 (3092 words)

	...::: UPenn School Of Medicine \| Kazanietz Lab :::... (Site not responding. Last check: 2007-10-25)
		The use of adenoviral delivery of active and inactive PKCs proved to be a highly efficient approach to determine which PKC isozymes mediate the apoptotic response.
		The development of transgenic mice for PKC isozymes will be critical to understand the functions of PKCs in normal prostate function and prostate carcinogenesis.
		Regulation of signaling pathways by PKC isozymes in prostate cancer cells.
	www.med.upenn.edu /marcelo/2a.html (325 words)

	EGF-Induced ERK Phosphorylation Independent of PKC Isozymes in Human Corneal Epithelial Cells -- Xu et al. 43 (12): ...
		The relative amount of PKC isozymes in each fraction was quantitated by gel scanning and expressed in square pixels (pixels in a defined area of the band).
		of ERK, depletion of phorbol ester–sensitive PKC isozymes
		of phorbol ester–sensitive PKC isozymes in corneal epithelial
	www.iovs.org /cgi/content/full/43/12/3673 (5040 words)

	Effects of Treatment with Haloperidol, Chlorpromazine, and Clozapine on Protein Kinase C (PKC) and ...
		PKC isozymes in the cortical brain area are given in Fig.
		-actin, and secondary anti-rabbit (for PKC isozymes) or anti-mouse (for
		PLC isozymes in both membrane and cytosol fractions of rat brain.
	jpet.aspetjournals.org /cgi/content/full/291/2/688 (7073 words)

	Role of Mitochondrial and Cytoplasmic Serine Hydroxymethyltransferase Isozymes in de Novo Purine Synthesis in ...
		In Saccharomyces cerevisiae, mitochondrial and cytoplasmic SHMT isozymes are encoded by distinct nuclear genes (SHM1 and SHM2).
		When yeast was grown on serine as the primary one-carbon source, the cytoplasmic isozyme was the main provider of glycine and one-carbon groups for purine synthesis.
		When grown on glycine, the mitochondrial SHMT was the predominant isozyme catalyzing the synthesis of serine from glycine and one-carbon units.
	pubs.acs.org /cgi-bin/abstract.cgi/bichaw/1997/36/i48/abs/bi971610n.html (353 words)

	Anti-CD3-induced changes in protein kinase C isozymes expression in human CD4+ and CD8+ T lymphocytes.
		Among all PKC isozymes studied, the least striking changes were observed in PKC zeta isozyme and the most striking changes were observed in PKC-epsilon isozyme.
		Laser-based confocal microscopic studies confirmed that the increase in fluorescence intensity of PKC isozymes following anti-CD3 moAb stimulation, as measured by flow cytometry was accompanied by the translocation of PKC isozymes from cytosol to the plasma membrane.
		This study demonstrates a differential effect of anti-CD3 moAb on the expression of PKC isozymes between CD4+ and CD8+ T cells and suggests that flow cytometry can be used to study the translocation of PKC isozymes from cytosol to the plasma membrane.
	www.aegis.com /aidsline/1996/apr/M9640592.html (424 words)

	Research
		Because most of the isozymes do not differ substantially in their substrate specificity or sensitivity to activators and cofactors it is possible that selectivity of such agents could not be readily achieved.
		My laboratory has capitalized on the findings that the activated isozymes are differentially localized within cells (2,3) and developed peptides that selectively block or induce this localization and the resulting function of the isozymes (4).
		In the above scheme, the yellow isozyme is likely to mediate regulation of gene expression by phosphorylating nuclear proteins, whereas the blue isozyme is likely to regulate the activity of membrane proteins, such as ion channels.
	www.stanford.edu /group/mochly-rosen/research.html (1528 words)

	Protein kinase C isozymes and the regulation of diverse cell responses -- Dempsey et al. 279 (3): 429 -- AJP - Lung ...
		Protein kinase C isozymes and the regulation of diverse cell responses -- Dempsey et al.
		PKC isozymes are homologous enzymes in which the functional specificity is determined by their subcellular localization (Fig.
		Isozyme-specific localization is due to binding of the activated isozymes to their corresponding anchoring proteins, termed receptors for activated C-kinase (RACKs).
	ajplung.physiology.org /cgi/content/full/279/3/L429 (5677 words)

	Differential regulation of steroid 5{alpha}-reductase isozymes expression by androgens in the adult rat brain -- TORRES ...
		Differential regulation of steroid 5{alpha}-reductase isozymes expression by androgens in the adult rat brain -- TORRES and ORTEGA 17 (11): 1428 -- The FASEB Journal
		-reductase isozymes expression by androgens in the adult rat brain
		Poletti, A., Negri-Cesi, P., Rabuffetti, M., Colciago, A., Celotti, F., Martini, L. (1998) Transient expression of the 5alpha-reductase type 2 isozyme in the rat brain in late fetal and early postnatal life.
	www.fasebj.org /cgi/content/full/17/11/1428 (3123 words)

	Isozymes of the Na-K-ATPase: heterogeneity in structure, diversity in function -- Blanco and Mercer 275 (5): 633 -- AJP ...
		Isozymes of the Na-K-ATPase: heterogeneity in structure, diversity in function -- Blanco and Mercer 275 (5): 633 -- AJP - Renal Physiology
		A differential function for the Na-K-ATPase isozymes is suggested by the stringent regulation of the expression of the
		Insect cells expressing the indicated isozymes were treated 40 h after infection with dibutyryl-cGMP alone (1 mM for 1 h) or with the addition of 1 µM of KT-5823.
	ajprenal.physiology.org /cgi/content/full/275/5/F633 (5746 words)

	Organellar and Cytosolic Localization of Four Phosphoribosyl Diphosphate Synthase Isozymes in Spinach -- Krath and ...
		Isozyme 2 was synthesized in vitro and shown to
		to mitochondria and that isozyme 4 may be located in the cytosol.
		The deduced amino acid sequences of isozymes 1 and 2 and isozymes
	www.plantphysiol.org /cgi/content/abstract/119/2/497 (407 words)

	TSRI - News and Publications
		All 3 isozymes act by synthesizing the diatomic molecule nitric oxide, which is paradoxically both a molecular signal (at low concentrations) and a cytotoxin (at high concentrations).
		Electron transfer from the reductase module to the oxygenase module is triggered by binding of the calcium-regulated protein calmodulin to the central linker that connects the 2 modules.
		We also analyzed the differential regulation of NOS isozymes by defining and characterizing the detailed molecular interactions of the individual NOS protein domains with each other, with their many cofactors, and with the calcium-binding protein calmodulin in the assembly and function of the active holoenzyme dimer.
	www.scripps.edu /news/sk/skaggs2002/sk12.html (1157 words)

	Molecular Evolution (Site not responding. Last check: 2007-10-25)
		The relationship of functional differences to the less obvious structural differences among isozymes of a given gene family is difficult to elucidate by structural information alone.
		The first is to continue to investigate the aldolase genes of lower vertebrates in primitive fish and other species and analyze these species for the number of aldolase genes and their phylogentic relationships using computational approaches.
		The second is to use the databases and look for isozymes from other vertebrates species and invesgigate their relationship to one another.
	www.bu.edu /aldolase/lab/aldolase/mol_evol/mol_evol.html (402 words)

	Role of Specific Protein Kinase C Isozymes in Mediating Epidermal Growth Factor, Thyrotropin-Releasing Hormone, and ...
		Role of Specific Protein Kinase C Isozymes in Mediating Epidermal Growth Factor, Thyrotropin-Releasing Hormone, and Phorbol Ester Regulation of the Rat Prolactin Promoter in GH4/GH4C1 Pituitary Cells -- Pickett et al.
		The panel on the right depicts the average PKC isozyme expression relative to that in S1 cells from two seperate blots determined by densitometric scanning of protein bands detected by enhanced chemiluminescence.
		without (control, Con) or with the indicated PKC isozyme constructs, and after 24 h extracts were prepared for immunoblot analysis.
	mend.endojournals.org /cgi/content/full/16/12/2840 (6673 words)

	Angiotensin II Promotes Glucose-Induced Activation of Cardiac Protein Kinase C Isozymes and Phosphorylation of Troponin ...
		of myocyte PKC isozymes occurs in response to 25 mmol/l glucose
		Effect of D609, genistein, and BAPTA/AM on translocation of PKC isozymes in adult rat ventricular myocytes exposed to 25 mmol/l glucose for 12 h.
		Gu X, Bishop SP: Increased protein kinase C and isozyme redistribution in pressure-over1oad cardiac hypertrophy in the rat.
	diabetes.diabetesjournals.org /cgi/content/full/50/8/1918 (5837 words)

	THE EYES HAVE IT
		In the 1960's "isozymes" were hot in biochemical research.
		From these studies, it became apparent that isozymes arise from gene duplication and expression of the resulting independently evolving homologous genes.
		Lactate dehydrogenase, perhaps the archetypical isozyme system of that era, conformed nicely to the model (2, 3).
	www.udel.edu /chem/white/C647/CS5EyesPg1.html (792 words)

	Expression and Activation of Protein Kinase C Isozymes by Prostaglandin F2{alpha} in the Early- and Mid-Luteal Phase ... (Site not responding. Last check: 2007-10-25)
		Expression and Activation of Protein Kinase C Isozymes by Prostaglandin F2{alpha} in the Early- and Mid-Luteal Phase Bovine Corpus Luteum -- Sen et al.
		for the PKC isozyme divided by the optical density for actin.
		Lanes c and d correspond with the experimental conditions where the primary antibody was preincubated with an excess amount of antigenic peptide prior to its use in the Western blot.
	www.biolreprod.org /cgi/content/full/70/2/379 (3840 words)

	Structure and characterization of the genes for murine choline/ethanolamine kinase isozymes {alpha} and {beta} -- ...
		Structure and characterization of the genes for murine choline/ethanolamine kinase isozymes {alpha} and {beta} -- Aoyama et al.
		upstream of the gene for an isozyme (muscle-type) of carnitine
		isozymes are 59.7% for both the mouse and rat and 60.6% for
	www.jlr.org /cgi/content/full/41/3/452 (5934 words)

	Bryostatin-1 attenuates TNF-induced epithelial barrier dysfunction: role of novel PKC isozymes -- Yoo et al. 284 (4): ...
		The effect of TNF (250 U/ml) on PKC isozyme activity was assessed by in vitro kinase assay.
		The effect of bryostatin-1 is mediated by a novel PKC isozyme.
		Interleukins 4 and 13 increase intestinal epithelial permeability by a phosphatidylinositol 3-kinase pathway.
	ajpgi.physiology.org /cgi/content/full/284/4/G703 (6067 words)

	Competition Between Cytochrome P-450 Isozymes for NADPH-Cytochrome P-450 Oxidoreductase Affects Drug Metabolism -- Li ...
		The P-450 isozymes were expressed from the plasmid pCW and the P-450 reductase from the plasmid pJR7, as previously described
		Assays were performed as described in Experimental Procedures with bacterial membranes containing 10 pmol of recombinant P-450 isozymes with CPR or with human liver microsomes corresponding to 200 pmol P-450.
		Ding S, Yao D, Burchell B, Wolf CR and Friedberg T (1997) High levels of recombinant CYP3A4 expression in Chinese hamster ovary cells are modulated by coexpressed human P450 reductase and by hemin supplementation.
	jpet.aspetjournals.org /cgi/content/full/289/2/661 (4484 words)

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