Archeabacterial phototaxis

Martin Engelhard, Georg Schmies and Ansgar A. Wegener

Table of Contents

Abstract 2

1.1 Introduction 2

1.2 Two-component systems in Archea 6

1.2.1 Chemotaxis in H. salinarum 6

1.2.2 Phototaxis of Halobacteria 8

1.2.3 Receptor/transducer complexes 9

1.3 Properties of sensory rhodopsins and the receptor/transducer complex 10

1.3.1 Primary sequences 11

1.3.2 Absorption spectra 12

1.3.3 Photocycle of sensory rhodopsins 14

1.3.4 Proton transfer reactions of sensory rhodopsins 16

1.3.4.1 Receptors as proton pumps 16

1.3.4.2 Proton transfer reactions in the receptor/transducer complexes 19

1.3.5 Properties of the SR/Htr complex 20

1.4 Molecular mechanism of the signal transfer 22

1.4.1 The receptor-transducer interaction 22

1.4.2 Molecular mechanism of the signal transfer 24

1.5 Outlook 26

Acknowledgements 26

References 26

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