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dc.contributor.authorColoso, Relicardo M.
dc.contributor.authorCruz, Lourdes J.
dc.date.accessioned2012-09-26T15:37:10Z
dc.date.available2012-09-26T15:37:10Z
dc.date.issued1980
dc.identifier.citationColoso, R. M., & Cruz, L. J. (1980). Preliminary studies in some aspects of amino acid biosynthesis in juveniles of Penaeus monodon Fabricius: II. Partial purification and characterization of muscle L-glutamate dehydrogenase. Bulletin of the Philippine Biochemistry Society, 3:23–37.en
dc.identifier.issn0115-6403
dc.identifier.urihttp://hdl.handle.net/10862/1102
dc.descriptionSEAFDEC Contribution No. 96.en
dc.description.abstractA method of partially purifying L-glutamate dehydrogenase, a key enzyme in the biosynthesis of non-essential amino acids, from the muscle of P. monodon juveniles is presented. Enzyme extraction with Tris-acetate buffer, ammonium sulfate fractionation, DEAE-cullulose chromatography, and Sepharose 4B chromatography were used. A 260-fold purification was obtained, but the recovery of enzyme activity was low. Possible modification in the method and the need for further purification are discussed. P. monodon possesses an enzyme which catalyzes the de novo synthesis of glutamate from alpha-ketoglutarate and ammonia. The enzyme has a pH optimum for the reductive amination of alpha-ketoglutarate between pH 8.0 and 8.2. The low Michaelis-Menten constant (1.03 x 10-4M) of the enzyme for alpha-ketoglutarate strongly suggests the physiological importance of this pathway in P. monodon. Substrate inhibition by alpha-ketoglutarate at high non-physiological levels was observed and discussed. The molecular weight of the native enzyme estimated by molecular sieve chromatography is 320,000 daltons. Subunit studies using SDS polyacrylamide gel electrophoresis suggest that the enzyme possesses a unique molecular organization compared to those derived from other sources.en
dc.language.isoenen
dc.publisherThe Philippine Biochemical Societyen
dc.subjectCrustaceaen
dc.subjectGiant tiger shrimpen
dc.subjectEnzymesen
dc.subjectAmino acidsen
dc.subjectBiosynthesisen
dc.subjectPhilippinesen
dc.subjectShrimpsen
dc.subjectPenaeus monodon
dc.titlePreliminary studies in some aspects of amino acid biosynthesis in juveniles of Penaeus monodon Fabricius: II. Partial purification and characterization of muscle L-glutamate dehydrogenaseen
dc.typeArticleen
dc.citation.volume3
dc.citation.issue1-2
dc.citation.spage23
dc.citation.epage37
dc.citation.journalTitleBulletin of the Philippine Biochemistry Societyen
dc.subject.scientificNamePenaeus monodon


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