期刊
PROTEINS-STRUCTURE FUNCTION AND BIOINFORMATICS
卷 83, 期 9, 页码 1677-1686出版社
WILEY
DOI: 10.1002/prot.24853
关键词
dynamic N-terminus; extrinsic photosynthetic protein; hydrogen bond dynamics; intrinsic disorder; solution structure; Spinacia oleracea
资金
- JKU scholarship
- OAD [AKTION 69p26]
- Austrian Science Funds FWF project NanoCell [W1250]
- Austrian Science Funds FWF [M1404]
- Austrian Science Fund (FWF) [M 1404] Funding Source: researchfish
- Austrian Science Fund (FWF) [M1404, W1250] Funding Source: Austrian Science Fund (FWF)
The extrinsic proteins of photosystem II of higher plants and green algae PsbO, PsbP, PsbQ, and PsbR are essential for stable oxygen production in the oxygen evolving center. In the available X-ray crystallographic structure of higher plant PsbQ residues S14-Y33 are missing. Building on the backbone NMR assignment of PsbQ, which includes this missing link, we report the extended resonance assignment including side chain atoms. Based on nuclear Overhauser effect spectra a high resolution solution structure of PsbQ with a backbone RMSD of 0.81 angstrom was obtained from torsion angle dynamics. Within the N-terminal residues 1-45 the solution structure deviates significantly from the X-ray crystallographic one, while the four-helix bundle core found previously is confirmed. A short -helix is observed in the solution structure at the location where a -strand had been proposed in the earlier crystallographic study. NMR relaxation data and unrestrained molecular dynamics simulations corroborate that the N-terminal region behaves as a flexible tail with a persistent short local helical secondary structure, while no indications of forming a -strand are found. Proteins 2015; 83:1677-1686. (c) 2015 The Authors. Proteins: Structure, Function, and Bioinformatics Published by Wiley Periodicals, Inc.
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