Access

You are not currently logged in.

Access your personal account or get JSTOR access through your library or other institution:

login

Log in to your personal account or through your institution.

If You Use a Screen Reader

This content is available through Read Online (Free) program, which relies on page scans. Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.

Role of the Chlorophyll Dimer in Bacterial Photosynthesis

Arieh Warshel
Proceedings of the National Academy of Sciences of the United States of America
Vol. 77, No. 6, [Part 1: Physical Sciences] (Jun., 1980), pp. 3105-3109
Stable URL: http://www.jstor.org/stable/8684
Page Count: 5
  • Read Online (Free)
  • Subscribe ($19.50)
  • Cite this Item
Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Role of the Chlorophyll Dimer in Bacterial Photosynthesis
Preview not available

Abstract

The role of a special dimer (D) of bacterio-chlorophyll molecules in bacterial photosynthesis was examined by calculations of the rates of electron transfer reactions in a system of the dimer and a bacteriopheophytin (BPh) molecule. It was found that the dependence of the potential surfaces of D on the distance between the monomers allows a fast light-induced electron transfer from D to BPh but only a slow back reaction (reduction of D+ by BPh-). The same potential surfaces allow efficient reduction of D+ by cytochrome c. Possible advantages of greatly different values of the electronic matrix elements for the forward and back reactions are pointed out. It is suggested that the electrostatic interaction between D+ and an ionized group of the protein might play an important role in the photosynthetic reaction.

Page Thumbnails

  • Thumbnail: Page 
3105
    3105
  • Thumbnail: Page 
3106
    3106
  • Thumbnail: Page 
3107
    3107
  • Thumbnail: Page 
3108
    3108
  • Thumbnail: Page 
3109
    3109