PMID:3301347: Difference between revisions

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<span style = 'font-size: large'> '''Michaud, C, Blanot, D, Flouret, B and Van Heijenoort, J'''  (1987) Partial purification and specificity studies of the D-glutamate-adding and D-alanyl-D-alanine-adding enzymes from Escherichia coli K12.''Eur. J. Biochem.'' '''166''':631-7</span>
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!align=left  |Citation
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'''Michaud, C, Blanot, D, Flouret, B and Van Heijenoort, J'''  (1987) Partial purification and specificity studies of the D-glutamate-adding and D-alanyl-D-alanine-adding enzymes from Escherichia coli K12. ''Eur. J. Biochem.'' '''166''':631-7
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!align=left  |Abstract
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The D-glutamate-adding and D-alanyl-D-alanine-adding enzymes from Escherichia coli were partially purified by fast protein liquid chromatography on an anion exchanger. Their relative molecular masses, determined by gel filtration on Superose 12, were 54,000 +/- 2000 and 51,000 +/- 2000, respectively. In order to investigate the specificity of these ligases, several compounds derived from their respective nucleotide substrates were prepared. In the case of the D-Glu-adding enzyme, DDP-MurNAc-L-Ala (DDP = dihydrouridine 5'-diphosphate) and P1-MurNAc-L-Ala were substrates of the reaction. In the case of the D-Ala-D-Ala-adding enzyme, only DDP-MurNAc-L-Ala-D-Glu(-meso-A2pm) was a substrate; P1-MurNAc-L-Ala-D-Glu(-meso-A2pm) was neither a substrate nor an inhibitor. Concerning the amino acid site of the D-Glu-adding enzyme, even closely related analogues of D-glutamate hardly inhibited the reaction.
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[http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=pubmed&dopt=Abstract&list_uids=3301347 PubMed]


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|{{TableHeadingColor}} |'''Abstract''' || The D-glutamate-adding and D-alanyl-D-alanine-adding enzymes from Escherichia coli were partially purified by fast protein liquid chromatography on an anion exchanger. Their relative molecular masses, determined by gel filtration on Superose 12, were 54,000 +/- 2000 and 51,000 +/- 2000, respectively. In order to investigate the specificity of these ligases, several compounds derived from their respective nucleotide substrates were prepared. In the case of the D-Glu-adding enzyme, DDP-MurNAc-L-Ala (DDP = dihydrouridine 5'-diphosphate) and P1-MurNAc-L-Ala were substrates of the reaction. In the case of the D-Ala-D-Ala-adding enzyme, only DDP-MurNAc-L-Ala-D-Glu(-meso-A2pm) was a substrate; P1-MurNAc-L-Ala-D-Glu(-meso-A2pm) was neither a substrate nor an inhibitor. Concerning the amino acid site of the D-Glu-adding enzyme, even closely related analogues of D-glutamate hardly inhibited the reaction.
!align=left  |Keywords
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Chromatography/methods; Escherichia coli/enzymology; Kinetics; Molecular Weight; Peptide Synthases/antagonists & inhibitors; Peptide Synthases/isolation & purification; Substrate Specificity
|{{TableHeadingColor}} nowrap |'''Links''' ||  [http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=pubmed&dopt=Abstract&list_uids=3301347 PubMed]
 
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Latest revision as of 04:46, 15 September 2013

Citation

Michaud, C, Blanot, D, Flouret, B and Van Heijenoort, J (1987) Partial purification and specificity studies of the D-glutamate-adding and D-alanyl-D-alanine-adding enzymes from Escherichia coli K12. Eur. J. Biochem. 166:631-7

Abstract

The D-glutamate-adding and D-alanyl-D-alanine-adding enzymes from Escherichia coli were partially purified by fast protein liquid chromatography on an anion exchanger. Their relative molecular masses, determined by gel filtration on Superose 12, were 54,000 +/- 2000 and 51,000 +/- 2000, respectively. In order to investigate the specificity of these ligases, several compounds derived from their respective nucleotide substrates were prepared. In the case of the D-Glu-adding enzyme, DDP-MurNAc-L-Ala (DDP = dihydrouridine 5'-diphosphate) and P1-MurNAc-L-Ala were substrates of the reaction. In the case of the D-Ala-D-Ala-adding enzyme, only DDP-MurNAc-L-Ala-D-Glu(-meso-A2pm) was a substrate; P1-MurNAc-L-Ala-D-Glu(-meso-A2pm) was neither a substrate nor an inhibitor. Concerning the amino acid site of the D-Glu-adding enzyme, even closely related analogues of D-glutamate hardly inhibited the reaction.

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Keywords

Chromatography/methods; Escherichia coli/enzymology; Kinetics; Molecular Weight; Peptide Synthases/antagonists & inhibitors; Peptide Synthases/isolation & purification; Substrate Specificity

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