AUTHOR=Netzer-El Sigal Yoli , Caspy Ido , Nelson Nathan 

TITLE=Crystal Structure of Photosystem I Monomer From Synechocystis PCC 6803

JOURNAL=Frontiers in Plant Science

VOLUME=9

YEAR=2019

URL=https://www.frontiersin.org/journals/plant-science/articles/10.3389/fpls.2018.01865

DOI=10.3389/fpls.2018.01865

ISSN=1664-462X

ABSTRACT=<p>A single histidine addition to the C-terminus of PsaL of <italic>Synechocystis</italic> sp. PCC 6803 was previously reported by our lab to shift the trimer-to-monomer ratio of PSI in favor of the monomeric form. P700 re-reduction and NADP<sup>+</sup> photo-reduction measurements of the PsaL<sup>HIS</sup> strain show no effect on PSI activity in comparison to the WT trimeric PSI. Crystal structure of the PsaL<sup>HIS</sup> monomeric PSI reveals several alterations that occurred in the trimerisation site of PSI, primarily a deformation of the C-terminus of PsaL and loss of chlorophyll a and β-carotene molecules.</p>