Effect of selenite on growth and protein synthesis in the phototrophic bacterium Rhodobacter sphaeroides.

Abstract:

:The effect of selenite on the growth rate and protein synthesis has been investigated in Rhodobacter sphaeroides. This photosynthetic bacterium efficiently reduces selenite with intracellular accumulation under both dark aerobic and anaerobic photosynthetic conditions. Addition of 1 mM selenite under these two growth conditions does not affect the final cell density, although a marked slowdown in growth rate is observed under aerobic growth. The proteome analysis of selenite response by two-dimensional gel electrophoresis shows an enhanced synthesis of some chaperones, an elongation factor, and enzymes associated to oxidative stress. The induction of these antioxidant proteins confirms that the major toxic effect of selenite is the formation of reactive oxygen species during its metabolism. In addition, we show that one mutant unable to precipitate selenite, selected from a transposon library, is affected in the smoK gene. This encodes a constituent of a putative ABC transporter implicated in the uptake of polyols. This mutant is less sensitive to selenite and does not express stress proteins identified in the wild type in response to selenite. This suggests that the entry of selenite into the cytoplasm is mediated by a polyol transporter in R. sphaeroides.

journal_name

Appl Environ Microbiol

authors

Bebien M,Chauvin JP,Adriano JM,Grosse S,Verméglio A

doi

10.1128/aem.67.10.4440-4447.2001

keywords:

subject

Has Abstract

pub_date

2001-10-01 00:00:00

pages

4440-7

issue

10

eissn

0099-2240

issn

1098-5336

journal_volume

67

pub_type

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