The extreme halophyte Salicornia veneta is depleted of the extrinsic PsbQ and PsbP proteins of the oxygen-evolving complex without loss of functional activity.

ABSTRACT:

Background and aims

Photosystem II of oxygenic organisms is a multi-subunit protein complex made up of at least 20 subunits and requires Ca(2+) and Cl(-) as essential co-factors. While most subunits form the catalytic core responsible for water oxidation, PsbO, PsbP and PsbQ form an extrinsic domain exposed to the luminal side of the membrane. In vitro studies have shown that these subunits have a role in modulating the function of Cl(-) and Ca(2+), but their role(s) in vivo remains to be elucidated, as the relationships between ion concentrations and extrinsic polypeptides are not clear. With the aim of understanding these relationships, the photosynthetic apparatus of the extreme halophyte Salicornia veneta has been compared with that of spinach. Compared to glycophytes, halophyt

SUBMITTER: Pagliano C 

PROVIDER: S-EPMC2707329 | biostudies-literature | 2009 Feb

REPOSITORIES: biostudies-literature