Energetics of the primary electron transfer reaction revealed by ultrafast spectroscopy on modified bacterial reaction centers

✍ Scribed by S. Schmidt; T. Arlt; P. Hamm; H. Huber; T. Nägele; J. Wachtveitl; M. Meyer; H. Scheer; W. Zinth

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 418 KB
• Volume: 223
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(94)00429-3

✦ Synopsis

The modification of reaction centers from Rhodobacter sphaeroides by the introduction of pheophytins instead of bacteriopheophytins leads to interesting changes in the primary photosynthetic reaction: long-living populations of the excited electronic state of the special pair P* and the bacteriochlorophyll anion Bi show up. The data allow the determination of the energetics in the reaction center. The free energy of the first intermediate P+Br , where the electron has reached the accessory bacteriochlorophyll BA lies = 450 cm-' below the initially excited special pair P*.