Geisselbrecht Y, Frühwirth S, Schroeder C, Pierik AJ, Klug G, Essen LO. CryB from Rhodobacter sphaeroides: a unique class of cryptochromes with new cofactors.
EMBO Rep 2012;
13:223-9. [PMID:
22290493 DOI:
10.1038/embor.2012.2]
[Citation(s) in RCA: 70] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2011] [Revised: 12/21/2011] [Accepted: 12/22/2011] [Indexed: 11/09/2022] Open
Abstract
Cryptochromes and photolyases are structurally related but have different biological functions in signalling and DNA repair. Proteobacteria and cyanobacteria harbour a new class of cryptochromes, called CryPro. We have solved the 2.7 Å structure of one of its members, cryptochrome B from Rhodobacter sphaeroides, which is a regulator of photosynthesis gene expression. The structure reveals that, in addition to the photolyase-like fold, CryB contains two cofactors only conserved in the CryPro subfamily: 6,7-dimethyl-8-ribityl-lumazine in the antenna-binding domain and a [4Fe-4S] cluster within the catalytic domain. The latter closely resembles the iron-sulphur cluster harbouring the large primase subunit PriL, indicating that PriL is evolutionarily related to the CryPro class of cryptochromes.
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