4ID8

The crystal structure of a [3Fe-4S] ferredoxin associated with CYP194A4 from R. palustris HaA2

Summary for 4ID8

• Entry DOI: 10.2210/pdb4id8/pdb
• Descriptor: Putative ferredoxin, FE3-S4 CLUSTER (3 entities in total)
• Functional Keywords: 4fe-4s single cluster domain, electron transport
• Biological source: Rhodopseudomonas palustris
• Total number of polymer chains: 1
• Total formula weight: 7888.24

Authors

Zhou, W.H.,Zhang, T.,Zhang, A.L.,Bell, S.G.,Wong, L.-L. (deposition date: 2012-12-11, release date: 2013-12-11, Last modification date: 2023-09-20)

Primary citation

Zhang, T.,Zhang, A.,Bell, S.G.,Wong, L.L.,Zhou, W.
The structure of a novel electron-transfer ferredoxin from Rhodopseudomonas palustris HaA2 which contains a histidine residue in its iron-sulfur cluster-binding motif.
Acta Crystallogr.,Sect.D, 70:1453-1464, 2014

PubMed Abstract: Rhodopseudomonas palustris HaA2 contains a gene, RPB3630, encoding a ferredoxin, HaPuxC, with an atypical CXXHXXC(X)nCP iron-sulfur cluster-binding motif. The ferredoxin gene is associated with a cytochrome P450 (CYP) monooxygenase-encoding gene, CYP194A3, an arrangement which is conserved in several strains of bacteria. Similar ferredoxin genes are found in other bacteria, such as Mycobacterium tuberculosis, where they are also associated with CYP genes. The crystal structure of HaPuxC has been solved at 2.3 Å resolution. The overall fold of this [3Fe-4S] cluster-containing ferredoxin is similar to other [3Fe-4S] and [4Fe-4S] species, with the loop around the iron-sulfur cluster more closely resembling those of [3Fe-4S] ferredoxins. The side chain of His17 from the cluster-binding motif in HaPuxC points away from the vacant site of the cluster and interacts with Glu61 and one of the sulfide ions of the cluster. This is the first cytochrome P450 electron-transfer partner of this type to be structurally characterized and will provide a better understanding of the electron-transfer processes between these ferredoxins and their CYP enzymes.

PubMed: 24816113
DOI: 10.1107/S139900471400474X

Experimental method

X-RAY DIFFRACTION (2.15 Å)