Affiliation:
1. Tokyo Research Laboratories, Kyowa Hakko Kogyo Co. Ltd., 3-6-6 Ashahi-machi, Machida-shi, 194-8533 Tokyo, Japan
2. Technical Research Laboratories, Kyowa Hakko Kogyo Co. Ltd., 1-1 Kyowa-cho, Hofu-shi, 747-8522 Yamaguchi, Japan
Abstract
ABSTRACT
The ATP-dependent carboxylate-amine/thiol ligase superfamily is known to contain enzymes catalyzing the formation of various types of peptide, such as
d
-alanyl-
d
-alanine, polyglutamate, and γ-peptide, but, curiously, no enzyme synthesizing α-dipeptides of
l
-amino acids is known. We attempted to find such an enzyme. By in silico screening based on the consensus sequence of the superfamily followed by an in vitro assay with purified enzyme to avoid the degradation of the peptide(s) synthesized,
ywfE
of
Bacillus subtilis
was found to code for the activity forming
l
-alanyl-
l
-glutamine from
l
-alanine and
l
-glutamine with hydrolysis of ATP to ADP. No AMP was formed, supporting the idea that the enzyme belongs to the superfamily. Surprisingly, the enzyme accepted a wide variety of
l
-amino acids. Among 231 combinations of
l
-amino acids tested, reaction products were obtained for 111 combinations and 44 kinds of α-dipeptides were confirmed by high-performance liquid chromatography analyses, while no tripeptide or longer peptide was detected and the
d
-amino acids were inert. From these results, we propose that
ywfE
encodes a new member of the superfamily,
l
-amino acid ligase.
Publisher
American Society for Microbiology
Subject
Molecular Biology,Microbiology
Cited by
102 articles.
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