ISDA

Entry Detail

PDB ID:

6C7S

Keywords:

OXIDOREDUCTASE

Title:

Structure of Rifampicin Monooxygenase with Product Bound

Biological Source:

Source Organism:

Nocardia farcinica (strain IFM 10152)

Host Organism:

Escherichia coli

PDB Version:

Deposition Date:

2018-01-23

Release Date:

2018-04-18

Method Details:

Experimental Method:

X-RAY DIFFRACTION

Resolution:

2.10 Å

R-Value Free:

0.24

R-Value Work:

0.19

R-Value Observed:

0.20

Space Group:

P 65 2 2

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Macromolecular Entities

Protein Blast

Polymer Type:polypeptide(L)
Description:Putative rifampin monooxygenase
Chain IDs:A
Chain Length:476
Number of Molecules:1
Biological Source:Nocardia farcinica (strain IFM 10152)

UniProt ID:Q5YTV5 Pfam ID:PF01494, PF21274 EC:1.14.13.211

Ligand Molecules

EDO

FAD

RFH

SO4

Primary Citation

Structural Evidence for Rifampicin Monooxygenase Inactivating Rifampicin by Cleaving Its Ansa-Bridge.

Liu, L.K, Dai, Y, Abdelwahab, H, Sobrado, P, Tanner, J.J.Show

Biochemistry 57 2065 2068 (2018)

PMID: 29578336 DOI: 10.1021/acs.biochem.8b00190

Abstact

Rifampicin monooxygenase (RIFMO) decreases the potency of rifampicin (RIF) by converting it to oxidative products. Further decomposition of RIF has been observed in bacteria producing RIFMO and contributes to RIFMO-mediated drug resistance. Here we report the first crystal structure of RIFMO in complex with the hydroxylated RIF product. The 2.10 Å resolution structure reveals a breach of the ansa aliphatic chain of RIF between naphthoquinone C2 and amide N1. Our data suggest that RIFMO catalyzes the hydroxylation of RIF at the C2 atom followed by cleavage of the ansa linkage, which leads to inactivation of the antibiotic by preventing key contacts with the RNA polymerase target.

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Primary Citation of related structures