当前位置： SCI文献检索 > BIOCHEMISTRY期刊下所有文献 > Subcloning, expression, and purification of the enterobactin biosynthetic enzyme 2,3-dihydroxybenzoate-AMP ligase: demonstration of enzyme-bound (2,3-dihydroxybenzoyl)adenylate product.

Subcloning, expression, and purification of the enterobactin biosynthetic enzyme 2,3-dihydroxybenzoate-AMP ligase: demonstration of enzyme-bound (2,3-dihydroxybenzoyl)adenylate product.

Abstract：

:The gene coding for the enzyme 2,3-dihydroxybenzoate-AMP ligase (2,3DHB-AMP ligase), responsible for activating 2,3-dihydroxybenzoic acid in the biosynthesis of the siderophore enterobactin, has been subcloned into the multicopy plasmid pKK223-3 and overproduced in a strain of Escherichia coli. The protein is an alpha 2 dimer with subunit molecular mass of 59 kDa. The enzyme catalyzes the exchange of [32P]pyrophosphate with ATP, dependent upon aromatic substrate with a turnover number of 340 min-1. The enzyme also releases pyrophosphate upon incubation with 2,3-dihydroxybenzoic acid and ATP; an initial burst corresponding to 0.7 nmol of pyrophosphate released per nanomole of enzyme is followed by a slower, continuous release with a turnover number of 0.41 min-1. The 1000-fold difference in rates observed between ATP-pyrophosphate exchange and continuous pyrophosphate release, as well as the close to stoichiometric amount of pyrophosphate released, suggests that intermediates are accumulating on the enzyme surface. Such intermediates have been observed and correspond to enzyme-bond (2,3-dihydroxybenzoyl)adenylate product.

journal_name

Biochemistry

journal_title

Biochemistry

authors

Rusnak F,Faraci WS,Walsh CT

doi

10.1021/bi00443a008

subject

Has Abstract

pub_date

1989-08-22 00:00:00

pages

6827-35

issue

17

eissn

0006-2960

issn

1520-4995

journal_volume

28

pub_type

杂志文章

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