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Effects of chloride ion binding on the photochemical properties of salinibacter sensory rhodopsin I.

Abstract：

:Microbial organisms utilize light not only as energy sources but also as signals by which rhodopsins (containing retinal as a chromophore) work as photoreceptors. Sensory rhodopsin I (SRI) is a dual photoreceptor that regulates both negative and positive phototaxis in microbial organisms, such as the archaeon Halobacterium salinarum and the eubacterium Salinibacter ruber. These organisms live in highly halophilic environments, suggesting the possibility of the effects of salts on the function of SRI. However, such effects remain unclear because SRI proteins from H. salinarum (HsSRI) are unstable in dilute salt solutions. Recently, we characterized a new SRI protein (SrSRI) that is stable even in the absence of salts, thus allowing us to investigate the effects of salts on the photochemical properties of SRI. In this study, we report that the absorption maximum of SrSRI is shifted from 542 to 556 nm in a Cl(-)-dependent manner with a K(m) of 307+/-56 mM, showing that Cl(-)-binding sites exist in SRI. The bathochromic shift was caused not only by NaCl but also by other salts (NaI, NaBr, and NaNO(3)), implying that I(-), Br(-), and NO(3)(-) can also bind to SrSRI. In addition, the photochemical properties during the photocycle are also affected by chloride ion binding. Mutagenesis studies strongly suggested that a conserved residue, His131, is involved in the Cl(-)-binding site. In light of these results, we discuss the effects of the Cl(-) binding to SRI and the roles of Cl(-) binding in its function.

journal_name

J Mol Biol

journal_title

Journal of molecular biology

authors

Suzuki D,Furutani Y,Inoue K,Kikukawa T,Sakai M,Fujii M,Kandori H,Homma M,Sudo Y

doi

10.1016/j.jmb.2009.06.050

subject

Has Abstract

pub_date

2009-09-11 00:00:00

pages

48-62

issue

1

eissn

0022-2836

issn

1089-8638

pii

S0022-2836(09)00772-4

journal_volume

392

pub_type

杂志文章

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