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Crystal structure of the PsbP protein of photosystem II from Nicotiana tabacum
Author(s) -
Ifuku Kentaro,
Nakatsu Toru,
Kato Hiroaki,
Sato Fumihiko
Publication year - 2004
Publication title -
embo reports
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 4.584
H-Index - 184
eISSN - 1469-3178
pISSN - 1469-221X
DOI - 10.1038/sj.embor.7400113
Subject(s) - nicotiana tabacum , photosystem ii , biology , chloroplast , cyanobacteria , protein structure , biophysics , crystallography , photosynthesis , chemistry , biochemistry , gene , genetics , bacteria
PsbP is a membrane‐extrinsic subunit of the water‐oxidizing complex photosystem II (PS II). The evolutionary origin of PsbP has long been a mystery because it specifically exists in higher plants and green algae but not in cyanobacteria. We report here the crystal structure of PsbP from Nicotiana tabacum at a resolution of 1.6 Å. Its structure is mainly composed of β‐sheet, and is not similar to any structures in cyanobacterial PS II. However, the electrostatic surface potential of PsbP is similar to that of cyanobacterial PsbV (cyt c 550 ), which has a function similar to PsbP. A structural homology search with the DALI algorithm indicated that the folding of PsbP is very similar to that of Mog1p, a regulatory protein for the nuclear transport of Ran GTPase. The structure of PsbP provides insight into its novel function in GTP‐regulated metabolism in PS II.