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ID 48634
file
creator
Takahashi, Hitoshi
Kitani, Kyoko
Mori, Miwako
Matoda, Yasuyuki
abstract
In the present study, we cloned a gene, designated bpsA, which encodes a single module type non-ribosomal peptide synthetase (NRPS) from a d-cycloserine (DCS)-producing Streptomyces lavendulae ATCC11924. A putative oxidation domain is significantly integrated into the adenylation domain of the NRPS, and the condensation domain is absent from the module. When S. lividans was transformed with a plasmid carrying bpsA, the transformed cells produced a blue pigment, suggesting that bpsA is responsible for the blue pigment synthesis. However, to produce the blue pigment in Escherichia coli, the existence of the 4′-phosphopantetheinyl transferase (PPTase) gene from Streptomyces was necessary, in addition to bpsA. The chemical structure of the pigment was determined as 5,5′-diamino-4,4′-dihydroxy-3,3′-diazadiphenoquinone-(2,2′), called indigoidine. The bpsA gene product, designated BPSA, was overproduced in an E. coli host-vector system and purified to homogeneity, demonstrating that the recombinant enzyme prefers l-Gln as a substrate. The in vitro experiment using l-Gln also showed that the blue pigment was formed by the purified BPSA only when the enzyme was phosphopantetheinylated by adding a Streptomyces PPTase purified from E. coli cells. Each site-directed mutagenesis experiment of Lys598, Tyr601, Ser603, and Tyr608, which are seen in the oxidation domain of BPSA, suggests that these residues are essential for the binding of FMN to the protein and the synthesis of the blue pigment.
journal title
Journal of Biological Chemistry
volume
Volume 282
issue
Issue 12
start page
9073
end page
9081
date of issued
2007-03-23
publisher
The American Society for Biochemistry and Molecular Biology, Inc.
issn
0021-9258
1083-351X
publisher doi
language
eng
nii type
Journal Article
HU type
Journal Articles
DCMI type
text
format
application/pdf
text version
publisher
rights
This research was originally published in the Journal of Biological Chemistry. H. Takahashi, T. Kumagai, K. Kitani, M. Mori, Y. Matoba, and M. Sugiyama. Cloning and Characterization of a Streptomyces Single Module Type Non-ribosomal Peptide Synthetase Catalyzing a Blue Pigment Synthesis. J. Biol. Chem. 2007; 282:pp.9073-9081. © the American Society for Biochemistry and Molecular Biology
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department
Graduate School of Biomedical Science