Pathways & interactions
Chlorophyll A-B binding protein (IPR022796)
Short name: Chloroa_b-bind
Overlapping homologous superfamilies
- Chlorophyll a/b binding domain superfamily (IPR023329)
- Chlorophyll A-B binding protein (IPR022796)
- Chlorophyll A-B binding protein, plant (IPR001344)
The light-harvesting complex (LHC) consists of chlorophylls A and B and the chlorophyll A-B binding protein. LHC functions as a light receptor that captures and delivers excitation energy to photosystems I and II with which it is closely associated. Under changing light conditions, the reversible phosphorylation of light harvesting chlorophyll a/b binding proteins (LHCII) represents a system for balancing the excitation energy between the two photosystems [PMID: 15225658].
The N terminus of the chlorophyll A-B binding protein extends into the stroma where it is involved with adhesion of granal membranes and photo-regulated by reversible phosphorylation of its threonine residues [PMID: 10682866]. Both these processes are believed to mediate the distribution of excitation energy between photosystems I and II.
This family also includes the photosystem II protein PsbS, which plays a role in energy-dependent quenching that increases thermal dissipation of excess absorbed light energy in the photosystem [PMID: 15033974].
- PF00504 (Chloroa_b-bind)