Tag Archives: proton pump

Functional significance of interhelical interactions between aspartic acid and cysteine residues in microbial rhodopsin

proton-pump type microbial rhodopsins

Microbial rhodopsins are photoreceptive seven-transmembrane proteins that contain all-trans retinal as a chromophore. Upon photon absorption, these proteins undergo a cycling photoreaction, where first the initial trans-to-cis isomerization of retinal induced by illumination leads to the formation