H+ flux across the photochemically active rhodopsin containing membrane

Value 0.95 µmol/(m^2×sec) Range: Table - link µmol/(m^2×sec)
Organism prokaryote
Reference John A. Raven Functional evolution of photochemical energy transformations in oxygen-producing organisms, Functional Plant Biology, 2009, 36, 505–515 p.511 table 1
Primary Source Falkowski PG, Raven JA (2007) ‘Aquatic photosynthesis, 2nd edn’. (Princeton University Press: Princeton)
Method Multiplying the density of the photochemical reaction centres (BNID 105044,105045) by the maximum specific reaction rate (BNID 105050,105051) gives a flux rate of energised product on an area basis. For rhodopsin this is ~0.95 µmol H+/(m^2×s^1), whereas for oxygenic photosynthesis it is ~1.5 µmol electron/(m^2×s^1) moved from water to NADP+ and 4.5 µmol H+/(m^2×s^1) (H+ : electron = 3: Falkowski and Raven 2007) (Table link).
Comments Bacteriorhodopsin is an integral membrane protein usually found in two-dimensional crystalline patches known as "purple membrane", which can occupy up to nearly 50% of the surface area of the archaeal cell. Data in table for purple membrane with half the area occupied by ion-pumping rhodopsin. See BNID 105054,105055
Entered by Uri M
ID 105053