Light saturated specific reaction rate of overall photochemical reaction for rhodopsin H+ pump

Value 7 Sec^-1 Range: Table - link Sec^-1
Organism Green algae Acetabularia acetabulum
Reference John A. Raven Functional evolution of photochemical energy transformations in oxygen-producing organisms, Functional Plant Biology, 2009, 36, 505–515 p.511 right column 2nd paragraph and table 1
Primary Source Tsunoda SP, Ewers D, Gazzarrini S, Moroni A, Gradmann D, Hegemann P. H+ -pumping rhodopsin from the marine alga Acetabularia. Biophys J. 2006 Aug 15 91(4):1471-9 AND Miranda MR, Choi AR, Shi L, Bezerra AG Jr, Jung KH, Brown LS. The photocycle and proton translocation pathway in a cyanobacterial ion-pumping rhodopsin. Biophys J. 2009 Feb 18 96(4):1471-81.PubMed ID16731558, 19217863
Method 1st primary source: Researchers cloned a full-length opsin-cDNA from Acetabularia, expressed it in Xenopus oocytes, and studied the properties of the corresponding rhodopsin, Acetabularia rhodopsin (AR), by voltage-clamp techniques. During this study, AR turned out to be a light-driven H+ exporting pump.
Comments The light-saturated specific reaction rate of the overall reaction is ~7 s^-1 for the rhodopsin H+ pump (primary sources) and ~300 s^-1 for non-cyclic electron transport with associated proton pumps, expressed in terms of PSII reaction centres (Falkowski and Raven 2007). BNID 105051
Entered by Uri M
ID 105050