Species differences in unlocking B‐side electron transfer in bacterial reaction centers

Publisher: John Wiley & Sons Inc

E-ISSN: 1873-3468|590|16|2515-2526

ISSN: 0014-5793

Source: FEBS Letters, Vol.590, Iss.16, 2016-08, pp. : 2515-2526

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Abstract

The structure of the bacterial photosynthetic reaction center (RC) reveals symmetry‐related electron transfer (ET) pathways, but only one path is used in native RCs. Analogous mutations have been made in two Rhodobacter (R.) species. A glutamic acid at position 133 in the M subunit increases transmembrane charge separation via the naturally inactive (B‐side) path through impacts on primary ET in mutant R. sphaeroidesRCs. Prior work showed that the analogous substitution in the R. capsulatusRC also increases B‐side activity, but mainly affects secondary ET. The overall yields of transmembrane ET are similar, but enabled in fundamentally different ways.

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