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The hemA gene encoding glutamyl-tRNA reductase from the archaeon Methanobacterium thermoautotrophicum strain Marburg.

Abstract：

:In archaea the first general tetrapyrrole precursor 5-aminolevulinic acid (ALA) is formed via the tRNA-dependent five-carbon pathway from glutamate. We have cloned the hemA gene encoding the central enzyme of the pathway glutamyl-tRNA reductase from the methanogenic archaeon Methanobacterium thermoautotrophicum by complementation of an Escherichia coli hemA mutant to ALA prototrophy. An 1194 bp open reading frame that encodes a 398 amino acid polypeptide with the calculated M, 44,509 was detected. The deduced amino acid sequence showed 20-35% amino acid identity to bacterial HemAs with the highest identity score to the Pseudomonas aeruginosa HemA. An identity of approximately 22% was found to plant HemAs. Glutamyl-tRNA reductase activity was shown for the M. thermoautotrophicum HemA after overexpression in E. coli and partial purification. The enzymatic reaction catalyzed by the partially purified enzyme revealed a temperature optimum of 65 degrees C at an optimal pH of 7.0. The reductase utilized preferentially NADPH for the reduction of the activated carboxyl group. The presence of ATP and GTP showed no obvious influence on catalysis.

journal_name

Bioorg Med Chem

journal_title

Bioorganic & medicinal chemistry

authors

Hungerer C,Weiss DS,Thauer RK,Jahn D

doi

10.1016/0968-0896(96)00098-3

subject

Has Abstract

pub_date

1996-07-01 00:00:00

pages

1089-95

issue

7

eissn

0968-0896

issn

1464-3391

pii

0968089696000983

journal_volume

4

pub_type

杂志文章

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