Enzymatic hydrolysis of alpha- and beta-oligo(L-aspartic acid)s by poly(aspartic acid) hydrolases-1 and 2 from Sphingomonas sp. KT-1.
Identifieur interne : 003067 ( Main/Curation ); précédent : 003066; suivant : 003068Enzymatic hydrolysis of alpha- and beta-oligo(L-aspartic acid)s by poly(aspartic acid) hydrolases-1 and 2 from Sphingomonas sp. KT-1.
Auteurs : Tomohiro Hiraishi [Japon] ; Mariko Kajiyama ; Ichiro Yamato ; Yoshiharu DoiSource :
- Macromolecular bioscience [ 1616-5187 ] ; 2004.
Descripteurs français
- KwdFr :
- MESH :
- enzymologie : Sphingomonas.
- métabolisme : Oligopeptides, Peptides, Protéines.
- Acide aspartique, Biopolymères, Cinétique, Hydrolyse, Oligopeptides, Peptides, Protéines, Serine endopeptidases.
English descriptors
- KwdEn :
- MESH :
- chemical , chemistry : Oligopeptides, Peptides, Proteins, Serine Endopeptidases.
- chemical , metabolism : Oligopeptides, Peptides, Proteins.
- chemical : Aspartic Acid, Biopolymers.
- enzymology : Sphingomonas.
- Hydrolysis, Kinetics.
Abstract
The enzymatic hydrolysis of alpha- and beta-oligo(L-aspartic acid)s by PAA hydrolase-1 and PAA hydrolase-2 (purified from Sphingomonas sp. KT-1) was performed to elucidate the mechanism of the microbial degradation by Sphingomonas sp. KT-1 of the thermally synthesized alpha,beta-poly(D,L-aspartic acid) (tPAA). GPC analysis of the hydrolyzed products of alpha- and beta-tetra(L-aspartic acid)s by PAA hydrolase-1 has showed that PAA hydrolase-1 is capable of hydrolyzing only the specific amide bonds between beta-aspartic acid units. The RP-HPLC analysis of the enzymatic hydrolysis of beta-oligo(L-aspartic acid)s (4 and 5 mers) by PAA hydrolase-1 has suggested that the enzymatic hydrolysis of beta-oligo(L-aspartic acid)s occurs via an endo-mode cleavage. In contrast, PAA hydrolase-2 hydrolyzed both alpha- and beta-oligo(L-aspartic acid)s via an exo-mode cleavage to yield L-aspartic acid as a final product. A kinetic study on the enzymatic hydrolysis of alpha-oligo(L-aspartic acid)s (3 to 7 mers) by PAA hydrolase-2 has indicated that Km values are almost independent of the number of monomer units in oligomers of 4 to 7 mers, while that Vmax values are markedly dependent on the chain length and show a maximum value at 5 mer.
DOI: 10.1002/mabi.200300085
PubMed: 15468224
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pubmed:15468224Le document en format XML
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<term>Kinetics</term>
<term>Oligopeptides (chemistry)</term>
<term>Oligopeptides (metabolism)</term>
<term>Peptides (chemistry)</term>
<term>Peptides (metabolism)</term>
<term>Proteins (chemistry)</term>
<term>Proteins (metabolism)</term>
<term>Serine Endopeptidases (chemistry)</term>
<term>Sphingomonas (enzymology)</term>
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<term>Biopolymères</term>
<term>Cinétique</term>
<term>Hydrolyse</term>
<term>Oligopeptides ()</term>
<term>Oligopeptides (métabolisme)</term>
<term>Peptides ()</term>
<term>Peptides (métabolisme)</term>
<term>Protéines ()</term>
<term>Protéines (métabolisme)</term>
<term>Serine endopeptidases ()</term>
<term>Sphingomonas (enzymologie)</term>
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<term>Peptides</term>
<term>Proteins</term>
<term>Serine Endopeptidases</term>
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<term>Kinetics</term>
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<term>Biopolymères</term>
<term>Cinétique</term>
<term>Hydrolyse</term>
<term>Oligopeptides</term>
<term>Peptides</term>
<term>Protéines</term>
<term>Serine endopeptidases</term>
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<front><div type="abstract" xml:lang="en">The enzymatic hydrolysis of alpha- and beta-oligo(L-aspartic acid)s by PAA hydrolase-1 and PAA hydrolase-2 (purified from Sphingomonas sp. KT-1) was performed to elucidate the mechanism of the microbial degradation by Sphingomonas sp. KT-1 of the thermally synthesized alpha,beta-poly(D,L-aspartic acid) (tPAA). GPC analysis of the hydrolyzed products of alpha- and beta-tetra(L-aspartic acid)s by PAA hydrolase-1 has showed that PAA hydrolase-1 is capable of hydrolyzing only the specific amide bonds between beta-aspartic acid units. The RP-HPLC analysis of the enzymatic hydrolysis of beta-oligo(L-aspartic acid)s (4 and 5 mers) by PAA hydrolase-1 has suggested that the enzymatic hydrolysis of beta-oligo(L-aspartic acid)s occurs via an endo-mode cleavage. In contrast, PAA hydrolase-2 hydrolyzed both alpha- and beta-oligo(L-aspartic acid)s via an exo-mode cleavage to yield L-aspartic acid as a final product. A kinetic study on the enzymatic hydrolysis of alpha-oligo(L-aspartic acid)s (3 to 7 mers) by PAA hydrolase-2 has indicated that Km values are almost independent of the number of monomer units in oligomers of 4 to 7 mers, while that Vmax values are markedly dependent on the chain length and show a maximum value at 5 mer.</div>
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