Replacement or exclusion of the B-branch bacteriopheophytin in the purple bacterial reaction centre: the H(B) cofactor is not required for assembly or core function of the Rhodobacter sphaeroides complex.

Abstract excerpt

All of the membrane-embedded cofactors of the purple bacterial reaction centre have well-defined functional or structural roles, with the exception of the bacteriopheophytin (H(B)) located approximately half-way across the membrane on the so-called inactive- or B-branch of cofactors. Sequence alignments indicate that this bacteriochlorin cofactor is a conserved feature of purple bacterial reaction centres, and a...

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