The diversity and distribution of D1 proteins in cyanobacteria.

Kevin J Sheridan, Elizabeth J Duncan, Julian J Eaton-Rye, Tina C Summerfield

Photosynthesis research 2020 Aug

filter terms:

The psbA gene family in cyanobacteria encodes different forms of the D1 protein that is part of the Photosystem II reaction centre. We have identified a phylogenetically distinct D1 group that is intermediate between previously identified G3-D1 and G4-D1 proteins (Cardona et al. Mol Biol Evol 32:1310-1328, 2015). This new group contained two subgroups: D1INT, which was frequently in the genomes of heterocystous cyanobacteria and D1FR that was part of the far-red light photoacclimation gene cluster of cyanobacteria. In addition, we have identified subgroups within G3, the micro-aerobically expressed D1 protein. There are amino acid changes associated with each of the subgroups that might affect the function of Photosystem II. We show a phylogenetically broad range of cyanobacteria have these D1 types, as well as the genes encoding the G2 protein and chlorophyll f synthase. We suggest identification of additional D1 isoforms and the presence of multiple D1 isoforms in phylogenetically diverse cyanobacteria supports the role of these proteins in conferring a selective advantage under specific conditions.

Citation

Kevin J Sheridan, Elizabeth J Duncan, Julian J Eaton-Rye, Tina C Summerfield. The diversity and distribution of D1 proteins in cyanobacteria. Photosynthesis research. 2020 Aug;145(2):111-128