ISDA

Entry Detail

PDB ID:

5HMC

Keywords:

HYDROLASE

Title:

Crystal structure of S. sahachiroi AziG complexed with 5-methyl naphthoic acid

Biological Source:

Source Organism:

Streptomyces sahachiroi

Host Organism:

Escherichia coli

PDB Version:

Deposition Date:

2016-01-15

Release Date:

2016-02-03

Method Details:

Experimental Method:

X-RAY DIFFRACTION

Resolution:

2.20 Å

R-Value Free:

0.21

R-Value Work:

0.18

R-Value Observed:

0.18

Space Group:

I 41 2 2

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Macromolecular Entities

Protein Blast

Polymer Type:polypeptide(L)
Description:Azi13
Chain IDs:A
Chain Length:141
Number of Molecules:1
Biological Source:Streptomyces sahachiroi

UniProt ID:B4XYA6 Pfam ID:PF03061

Ligand Molecules

5NE

SO4

Primary Citation

Polyketide Ring Expansion Mediated by a Thioesterase, Chain Elongation and Cyclization Domain, in Azinomycin Biosynthesis: Characterization of AziB and AziG.

Mori, S, Simkhada, D, Zhang, H, Erb, M.S, Zhang, Y, Williams, H, Fedoseyenko, D, Russell, W.K, Kim, D, Fleer, N, Ealick, S.E, Watanabe, C.M.Show

Biochemistry 55 704 714 (2016)

PMID: 26731610 DOI: 10.1021/acs.biochem.5b01050

Abstact

The azinomycins are a family of potent antitumor agents with the ability to form interstrand cross-links with DNA. This study reports on the unusual biosynthetic formation of the 5-methyl naphthoate moiety, which is essential for effective DNA association. While sequence analysis predicts that the polyketide synthase (AziB) catalyzes the formation of this naphthoate, 2-methylbenzoic acid, a truncated single-ring product, is formed instead. We demonstrate that the thioesterase (AziG) acts as a chain elongation and cyclization (CEC) domain and is required for the additional two rounds of chain extension to form the expected product.

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Primary Citation of related structures