Influences on tocopherol biosynthesis in the cyanobacterium Synechocystis sp. PCC 6803.

Abstract:

:To elucidate influences on the tocopherol biosynthesis in cyanobacteria, wild type and mutant cells of a putative methyltransferase in tocopherol and plastoquinone biosynthesis of Synechocystis sp. PCC 6803 were grown under different conditions. The vitamin E content of cells grown under different light regimes, photomixotrophic or photoautotrophic conditions and varying carbon dioxide supplies were compared by HPLC measurements. The tocopherol levels in wild type cells increased under higher light conditions and low carbon dioxide supply. Photomixotrophic growth led to lower vitamin E amounts in the cells compared to those grown photoautotrophically. We were able to segregate a homozygous deltasll0418 mutant under photoautotrophic conditions. In contrast to former suggestions in the literature the deletion of this gene is not lethal under photomixotrophic conditions and the influence on tocopherol and plastoquinone amounts is diminutive. The methyltransferase encoded by the gene sll0418 is not essential either for tocopherol or plastoquinone synthesis.

journal_name

J Plant Physiol

authors

Backasch N,Schulz-Friedrich R,Appel J

doi

10.1016/j.jplph.2005.04.006

subject

Has Abstract

pub_date

2005-07-01 00:00:00

pages

758-66

issue

7

eissn

0176-1617

issn

1618-1328

pii

S0176-1617(05)00131-8

journal_volume

162

pub_type

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