PMID:11368019: Difference between revisions

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<span style = 'font-size: large'> '''Mikkelsen, R, Binderup, K and Preiss, J'''  (2001) Tyrosine residue 300 is important for activity and stability of branching enzyme from Escherichia coli.''Arch. Biochem. Biophys.'' '''385''':372-7</span>
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|{{TableHeadingColor}} |'''Abstract''' || Branching enzyme belongs to the alpha-amylase family, which includes enzymes that catalyze hydrolysis or transglycosylation at alpha-(1,4)- or alpha-(1,6)-glucosidic linkages. In the alpha-amylase family, four highly conserved regions are proposed to make up the active site. From amino acid sequence analysis a tyrosine residue is completely conserved in the alpha-amylase family. In Escherichia coli branching enzyme, this residue (Y300) is located prior to the conserved region 1. Site-directed mutagenesis of the Y300 residue in E. coli branching enzyme was used in order to study its possible function in branching enzymes. Replacement of Y300 with Ala, Asp, Leu, Ser, and Trp resulted in mutant enzymes with less than 1% of wild-type activity. A Y300F substitution retained 25% of wild-type activity. Kinetic analysis of Y300F showed no effect on the Km value. The heat stability of Y300F was analyzed, and this was lowered significantly compared to that of the wild-type enzyme. Y300F also showed lower relative activity at elevated temperatures compared to wild-type. Thus, these results show that Tyr residue 300 in E. coli branching enzyme is important for activity and thermostability of the enzyme.
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'''No author listed''' (2001) Tyrosine residue 300 is important for activity and stability of branching enzyme from Escherichia coli. ''Arch. Biochem. Biophys.'' '''385''':372-7
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!align=left  |Abstract
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Branching enzyme belongs to the alpha-amylase family, which includes enzymes that catalyze hydrolysis or transglycosylation at alpha-(1,4)- or alpha-(1,6)-glucosidic linkages. In the alpha-amylase family, four highly conserved regions are proposed to make up the active site. From amino acid sequence analysis a tyrosine residue is completely conserved in the alpha-amylase family. In Escherichia coli branching enzyme, this residue (Y300) is located prior to the conserved region 1. Site-directed mutagenesis of the Y300 residue in E. coli branching enzyme was used in order to study its possible function in branching enzymes. Replacement of Y300 with Ala, Asp, Leu, Ser, and Trp resulted in mutant enzymes with less than 1% of wild-type activity. A Y300F substitution retained 25% of wild-type activity. Kinetic analysis of Y300F showed no effect on the Km value. The heat stability of Y300F was analyzed, and this was lowered significantly compared to that of the wild-type enzyme. Y300F also showed lower relative activity at elevated temperatures compared to wild-type. Thus, these results show that Tyr residue 300 in E. coli branching enzyme is important for activity and thermostability of the enzyme.
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[http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=pubmed&dopt=Abstract&list_uids=11368019 PubMed]
Online version:[http://dx.doi.org/10.1006/abbi.2000.2164 10.1006/abbi.2000.2164]
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|{{TableHeadingColor}} nowrap |'''Links''' ||  [http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=pubmed&dopt=Abstract&list_uids=11368019 PubMed]
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1,4-alpha-Glucan Branching Enzyme/chemistry; 1,4-alpha-Glucan Branching Enzyme/genetics; 1,4-alpha-Glucan Branching Enzyme/metabolism; Amino Acid Sequence; Amino Acid Substitution/genetics; Binding Sites; Catalysis; Conserved Sequence/genetics; Enzyme Stability; Escherichia coli/enzymology; Escherichia coli/genetics; Hot Temperature; Kinetics; Mutagenesis, Site-Directed/genetics; Mutation/genetics; Tyrosine/genetics; Tyrosine/metabolism
 
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==Significance {{HelpIcon|Help:Literature}} ==
==Significance {{HelpIcon|Help:Literature}} ==
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{{LitSignificance}}

Revision as of 18:02, 1 September 2013

Citation

No author listed (2001) Tyrosine residue 300 is important for activity and stability of branching enzyme from Escherichia coli. Arch. Biochem. Biophys. 385:372-7

Abstract

Branching enzyme belongs to the alpha-amylase family, which includes enzymes that catalyze hydrolysis or transglycosylation at alpha-(1,4)- or alpha-(1,6)-glucosidic linkages. In the alpha-amylase family, four highly conserved regions are proposed to make up the active site. From amino acid sequence analysis a tyrosine residue is completely conserved in the alpha-amylase family. In Escherichia coli branching enzyme, this residue (Y300) is located prior to the conserved region 1. Site-directed mutagenesis of the Y300 residue in E. coli branching enzyme was used in order to study its possible function in branching enzymes. Replacement of Y300 with Ala, Asp, Leu, Ser, and Trp resulted in mutant enzymes with less than 1% of wild-type activity. A Y300F substitution retained 25% of wild-type activity. Kinetic analysis of Y300F showed no effect on the Km value. The heat stability of Y300F was analyzed, and this was lowered significantly compared to that of the wild-type enzyme. Y300F also showed lower relative activity at elevated temperatures compared to wild-type. Thus, these results show that Tyr residue 300 in E. coli branching enzyme is important for activity and thermostability of the enzyme.

Links

PubMed Online version:10.1006/abbi.2000.2164

Keywords

1,4-alpha-Glucan Branching Enzyme/chemistry; 1,4-alpha-Glucan Branching Enzyme/genetics; 1,4-alpha-Glucan Branching Enzyme/metabolism; Amino Acid Sequence; Amino Acid Substitution/genetics; Binding Sites; Catalysis; Conserved Sequence/genetics; Enzyme Stability; Escherichia coli/enzymology; Escherichia coli/genetics; Hot Temperature; Kinetics; Mutagenesis, Site-Directed/genetics; Mutation/genetics; Tyrosine/genetics; Tyrosine/metabolism

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