Picosecond kinetics in reaction centers of Rps. sphaeroides and the effects of ubiquinone extraction and reconstitution.

abstract

• Following picosecond light activation, the bacteriochlorophyll and bacteriopheophytin complement of Rps. sphaeroides reaction centers depleted of ubiquinone behaves as though it has no primary electron acceptor; the excited intermediary BChl BPh state formed in <10 ps lasts >1 ns. Addition of ubiquinone-10 reconstitutes the very rapid electron transfer rates from the excited intermediary BCh BPh state to ubiquinone; the kinetics and rate are similar to that encountered in the untreated reaction centers. Interpretation of the data presented suggests that ubiquinone is the immediate electron acceptor from BPh{minus sign, dot below}. This is consistent with the model for the primary reactions leading to [(BChl)2{plus sign, dot below}BPh]Q{minus sign, dot below}. 1976.

authors

• Rentzepis, Peter

published proceedings

• Biochem Biophys Res Commun

author list (cited authors)

• Kaufmann, K. J., Petty, K. M., Dutton, P. L., & Rentzepis, P. M.

citation count

• 84

complete list of authors

• Kaufmann, KJ||Petty, KM||Dutton, PL||Rentzepis, PM

publication date

• June 1976

publisher

• Elsevier  Publisher

published in

• Biochemical and Biophysical Research Communications  Journal

keywords

• Kinetics
• Light
• Photochemistry
• Photosynthesis
• Rhodobacter Sphaeroides
• Spectrophotometry
• Time Factors
• Ubiquinone

PubMed Central ID

• 1084745

Digital Object Identifier (DOI)

• 10.1016/0006-291x(76)90668-9

start page

• 839

end page

• 845

volume

• 70

issue

• 3

URL

• http%3A%2F%2Fdx.doi.org%2F10.1016%2F0006-291x%2876%2990668-9