Jo CH, Kim J, Han AR, Park SY, Hwang KY, Nam KH. Crystal structure of Thermoplasma acidophilum XerA recombinase shows large C-shape clamp conformation and
cis-cleavage mode for nucleophilic tyrosine.
FEBS Lett 2016;
590:848-56. [PMID:
26919387 DOI:
10.1002/1873-3468.12109]
[Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2016] [Revised: 02/15/2016] [Accepted: 02/18/2016] [Indexed: 11/08/2022]
Abstract
Site-specific Xer recombination plays a pivotal role in reshuffling genetic information. Here, we report the 2.5 Å crystal structure of XerA from the archaean Thermoplasma acidophilum. Crystallographic data reveal a uniquely open conformational state, resulting in a C-shaped clamp with an angle of ~ 48° and a distance of 57 Å between the core-binding and the catalytic domains. The catalytic nucleophile, Tyr264, is positioned in cis-cleavage mode by XerA's C-term tail that interacts with the CAT domain of a neighboring monomer without DNA substrate. Structural comparisons of tyrosine recombinases elucidate the dynamics of Xer recombinase.
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