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• W2065676930 endingPage "76" @default.
• W2065676930 startingPage "67" @default.
• W2065676930 abstract "The genome of the cyanobacterium Synechocystis sp. PCC 6803 contains genes identified as menD and menE, homologs of Escherichia coli genes that code for 2-succinyl-6-hydroxyl-2,4-cyclohexadiene-1-carboxylate (SHCHC) synthase and O-succinylbenzoic acid–CoA ligase in the menaquinone biosynthetic pathway. In cyanobacteria, the product of this pathway is 2-methyl-3-phytyl-1,4-naphthoquinone (phylloquinone), a molecule used exclusively as an electron transfer cofactor in Photosystem (PS) I. The menD− and menE− strains were generated, and both were found to lack phylloquinone. Hence, no alternative pathways exist in cyanobacteria to produce O-succinylbenzoyl–CoA. Q-band EPR studies of photoaccumulated quinone anion radical and optical kinetic studies of the P700+ [FA/FB]− backreaction indicate that in the mutant strains, plastoquinone-9 functions as the electron transfer cofactor in the A1 site of PS I. At a light intensity of 40 μE m−2 s−1, the menD− and menE− mutant strains grew photoautotrophically and photoheterotrophically, but with doubling times slower than the wild type. Both of which are sensitive to high light intensities. Low-temperature fluorescence studies show that in the menD− and menE− mutants, the ratio of PS I to PS II is reduced relative to the wild type. Whole-chain electron transfer rates in the menD− and menE− mutant cells are correspondingly higher on a chlorophyll basis. The slower growth rate and high-light sensitivity of the menD− and menE− mutants are therefore attributed to a lower content of PS I per cell." @default.
• W2065676930 created "2016-06-24" @default.
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• W2065676930 date "2003-03-01" @default.
• W2065676930 modified "2023-09-29" @default.
• W2065676930 title "The menD and menE homologs code for 2-succinyl-6-hydroxyl-2,4-cyclohexadiene-1-carboxylate synthase and O-succinylbenzoic acid–CoA synthase in the phylloquinone biosynthetic pathway of Synechocystis sp. PCC 6803" @default.
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• W2065676930 doi "https://doi.org/10.1016/s0005-2728(02)00396-1" @default.
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