Elucidation of the preferred routes of C8-vinyl reduction in chlorophyll and bacteriochlorophyll biosynthesis

Canniffe, Daniel P ORCID: 0000-0002-5022-0437, Chidgey, Jack W and Hunter, C Neil (2014) Elucidation of the preferred routes of C8-vinyl reduction in chlorophyll and bacteriochlorophyll biosynthesis. BIOCHEMICAL JOURNAL, 462 (3). pp. 433-440.

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Abstract

Most of the chlorophylls and bacteriochlorophylls utilized for light harvesting by phototrophic organisms carry an ethyl group at the C8 position of the molecule, the product of a C8-vinyl reductase acting on a chlorophyll/bacteriochlorophyll biosynthetic precursor. Two unrelated classes of C8-vinyl reductase are known to exist, BciA and BciB, found in the purple phototroph Rhodobacter sphaeroides and the cyanobacterium Synechocystis sp. PCC6803 respectively. We constructed strains of each bacterium with the native C8-vinyl reductase swapped for the other class of the enzyme, and combined these replacements with a series of deletions of the native bch and chl genes. In vivo data indicate that the preferred substrates for both classes of the enzyme is C8-vinyl chlorophyllide, with C8-vinyl protochlorophyllide reduced only under conditions in which this pigment accumulates as a result of perturbed formation of chlorophyllide.

Item Type:	Article
Uncontrolled Keywords:	bacteriochlorophyll biosynthesis, chlorophyll, C8-vinyl reductase, photosynthesis, Rhodobacter sphaeroides, Synechocystis sp PCC6803
Depositing User:	Symplectic Admin
Date Deposited:	17 Jan 2019 08:22
Last Modified:	19 Jan 2023 01:06
DOI:	10.1042/BJ20140163
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3031335