FTIR Spectroscopy Revealing Light-Dependent Refolding of the Conserved Tongue Region of Bacteriophytochrome.

FTIR Spectroscopy Revealing Light-Dependent Refolding of the Conserved Tongue Region of Bacteriophytochrome.
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DOI:
10.1021/jz501189t
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发表时间:
2014-08-07
期刊:
The journal of physical chemistry letters
影响因子:
--
通讯作者:
Kennis JT
Kennis JT
中科院分区:
其他
文献类型:
--
作者:
Stojković EA;Toh KC;Alexandre MT;Baclayon M;Moffat K;Kennis JT

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细菌光敏色素(BphPs)构成一类光敏蛋白质,通过吸收红光和远红光在Pr和Pfr功能状态之间切换。BphPs的感光核心由PAS、GAF和PHY结构域组成。在这里,我们采用FTIR光谱研究Pr到Pfr光转换后沼泽红球藻BphP2(RpBphP2)的二级结构的变化。我们的研究结果表明,在PHY结构域的所谓舌区中,β-折叠转化为α-螺旋元件,这与耐辐射球菌DrBphP在黑暗和光明状态下的最新X射线结构一致(; et al.,,−)。GAF结构域中与PHY结构域非共价连接的保守的Asp和PHY结构域的舌区中的保守的Pro对于β-片层到α-螺旋的转化是必需的。
Bacteriophytochromes (BphPs) constitute a class of photosensory proteins that toggle between Pr and Pfr functional states through absorption of red and far-red light. The photosensory core of BphPs is composed of PAS, GAF, and PHY domains. Here, we apply FTIR spectroscopy to investigate changes in the secondary structure of Rhodopseudomonas palustris BphP2 (RpBphP2) upon Pr to Pfr photoconversion. Our results indicate conversion from a β-sheet to an α-helical element in the so-called tongue region of the PHY domain, consistent with recent X-ray structures of Deinococcus radiodurans DrBphP in dark and light states (; et al. , , −). A conserved Asp in the GAF domain that noncovalently connects with the PHY domain and a conserved Pro in the tongue region of the PHY domain are essential for the β-sheet-to-α-helix conversion.
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