It was proposed previously that the N-terminal domain of the
OCP that contains R155 is directly involved in the binding of
the OCPr to APC trimers based on site-directed mutagenesis
and quenching analysis. Furthermore, breakage of the R155−
E244 salt bridge could play an important role during the
activation of the OCP.13 There are multiple APC trimers,
including multiple APC660 species and at least two APC680
species, in the PBS core. Determining which APC trimer the
OCPr is binding will improve our understanding of the detailed
photoprotection mechanism in cyanobacteria. Our results
narrow down the OCP binding site to the cleft formed
between two APC trimers and thus will facilitate future
experiments such as determining which amino acids on either
the OCP or the ApcB are playing important roles in the
stabilization or destabilization of the quenching complex.
The C-terminal domain of the OCP (D220, V232, and
F299) was recently shown to be involved in the interactions
between FRP,16 which in vivo is essential to recovering the full
capacity of the PBS light harvesting function, presumably by
playing a role in detaching the OCPr. In our model, three
amino acid residues (D220, V232, and F299) are located on the
It was proposed previously that the N-terminal domain of the
OCP that contains R155 is directly involved in the binding of
the OCPr to APC trimers based on site-directed mutagenesis
and quenching analysis. Furthermore, breakage of the R155−
E244 salt bridge could play an important role during the
activation of the OCP.13 There are multiple APC trimers,
including multiple APC660 species and at least two APC680
species, in the PBS core. Determining which APC trimer the
OCPr is binding will improve our understanding of the detailed
photoprotection mechanism in cyanobacteria. Our results
narrow down the OCP binding site to the cleft formed
between two APC trimers and thus will facilitate future
experiments such as determining which amino acids on either
the OCP or the ApcB are playing important roles in the
stabilization or destabilization of the quenching complex.
The C-terminal domain of the OCP (D220, V232, and
F299) was recently shown to be involved in the interactions
between FRP,16 which in vivo is essential to recovering the full
capacity of the PBS light harvesting function, presumably by
playing a role in detaching the OCPr. In our model, three
amino acid residues (D220, V232, and F299) are located on the
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