Number of PPRs [proton-pumping rhodopsins] in specialized purple membrane

Range >100,000 PPRs/cell
Organism Archaea Halobacterium salinarum
Reference Claassens NJ, Volpers M, dos Santos VA, van der Oost J, de Vos WM. Potential of proton-pumping rhodopsins: engineering photosystems into microorganisms. Trends Biotechnol. 2013 Nov31(11):633-42. doi: 10.1016/j.tibtech.2013.08.006. p.636 right column 2nd paragraphPubMed ID24120288
Primary Source Wagner, G. and Hope, A.B. (1976) Proton transport in Halobacterium halobium. Funct. Plant Biol. 3, 665–676 [Australian Journal of Plant Physiology 3(5)]
Comments p.636 right column 2nd paragraph:"In addition to available membrane, also the density of PPRs in the membrane of an engineered host should be considered. A high density of PPRs (>100 000 per cell) seems possible in the specialized purple membrane of H. salinarum harboring bacteriorhodopsin [primary source]. In these purple membranes, bacteriorhodopsins occur as trimers."
Entered by Uri M
ID 111697