Functions as an antenna for photosystem I (PSI) under iron-limiting conditions, when phycobilisomes disappear. In the (PSI)3(Isi3)18 complex most of the harvested energy is probably used by PSI; in other PSI-containing supercomplexes a large part of the energy will probably not be used for light harvesting, but rather is dissipated to protect the organism from light damage.

Belongs to the PsbB/PsbC family. IsiA/Pcb subfamily.

342 amino acids

MQTYDNPDVKYEWWAGNARFADLSGQFIGAHVAHAALIVFWAGAFTLFEISYFDPTLPMGEQNLILLPHLATLGLGIEGNGAINTEPYFVIGAIHLISSAVLAAGGLFHVLRGPQDLKTATGPARRFHFDWEDPKQLGLILGHHLLLLGLGAFLLVAKAMYFGGLYDTATQTVRLVTEPTLDPAVIYGYQTHFATVDNLEDIVGGHIYVGVLLVAGGIWHILVPPLQWAKKVLLFSGEAILSYSLGAIALAGFVAAYFCAVNTTAYPVEFYGPVLDVKLSIVPYFADTIELPMNEHTSRAWLANAHFFFAFFFLQGHLWHALRAMGFDFRRVEKVLSDPLDA

37.6 kDa

(Note: Representative image - actual molecular weight may vary depending on tag type and expression method)

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