Phycobilisomes (PBSs) are the major light-harvesting systems in cyanobacteria
and red algae. PBS is a supercomplex that is composed of a core complex and
multiple peripheral rod complexes. Typically, the core consists of two or five
cylinders lying on the membrane with, in most cases, multiple rods radiating
from the core to form a hemidiscoidal structure. The building units of the
core cylinders and the peripheral rods are trimeric and hexameric discs, in
which a monomer consists of a pair of related phycobiliproteins (PBPs), such
as phycorerythrins, phycoerythrocyanins, phycocyanins, and allophycocyanins.
The discs are connected to each other via specific linker polypeptides to form
peripheral rods or core cylinders. Linker polypeptides share a conserved
domain of ~180 residues, which can be present in one or multiple copies [1,5].
The profile we developed covers the entire PBS linker domain.
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