Phototactic and chemotactic signal transduction by transmembrane receptors and transducers in microorganisms

Daisuke Suzuki, Hiroki Irieda, Michio Homma, Ikuro Kawagishi, Yuki Sudo

Research output: Contribution to journalArticle

22 Citations (Scopus)


Microorganisms show attractant and repellent responses to survive in the various environments in which they live. Those phototaxic (to light) and chemotaxic (to chemicals) responses are regulated by membrane-embedded receptors and transducers. This article reviews the following: (1) the signal relay mechanisms by two photoreceptors, Sensory Rhodopsin I (SRI) and Sensory Rhodopsin II (SRII) and their transducers (HtrI and HtrII) responsible for phototaxis in microorganisms; and (2) the signal relay mechanism of a chemoreceptor/transducer protein, Tar, responsible for chemotaxis in E. coli. Based on results mainly obtained by our group together with other findings, the possible molecular mechanisms for phototaxis and chemotaxis are discussed.

Original languageEnglish
Pages (from-to)4010-4039
Number of pages30
Issue number4
Publication statusPublished - Apr 2010
Externally publishedYes



  • Chemotaxis
  • Phototaxis
  • Rhodopsin
  • Signal transduction
  • Transducer

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Atomic and Molecular Physics, and Optics
  • Analytical Chemistry
  • Biochemistry

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