Potassium chemotaxis in Rhodobacter sphaeroides

FEBS Letters

Brown, Simon¹  Poole, Philip S.¹  Armitage, Judith P.¹ 

[1] Microbiology Unit Department of Biochemistry, University of Oxford, South Parks Road Oxford 0X1 3QU, England

关键词: Bacterial chemotaxis;    Motility;    Membrane potential;    ΔpH;   

DOI  :  10.1016/0014-5793(90)80073-R

学科分类：生物化学/生物物理

来源: John Wiley & Sons Ltd.

【 摘 要 】

The addition of potassium to Rhodobacter sphaeroides in the absence of magnesium increased the membrane potential, as measured by the carotenoid bandshift. In the presence of magnesium, potassium decreased the membrane potential. Potassium stimulated the mean population swimming speed by 33% and 48% in the presence or absence of magnesium, respectively. Chemotactic responses of R. sphaeroides to potassium were also unaffected by the presence or absence of magnesium. These results suggest that the membrane potential and by inference the ΔpH and Δμ_H + are not involved in chemotactic signalling towards potassium.

【 授权许可】

Unknown