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Title: Structure‐based control of the rate limitation of photosynthetic electron transport

Journal Article · · FEBS Letters
 [1];  [1];  [2];  [3]; ORCiD logo [2];  [2];  [1]
  1. Department of Biological Sciences Purdue University West Lafayette IN USA
  2. Department of Biochemistry Purdue University West Lafayette IN USA
  3. Laboratory of Chemical Physics NIDDK/NIH Bethesda MD USA

The 2.5 Å structure of the cytochrome (cyt) b 6 f complex provides a basis for control of the rate‐limiting electron transfer step of oxygenic photosynthesis associated with the plastoquinol/quinone exchange pathway. Here, a structural change was made at a site containing two proline residues which border the intra‐cyt pathway for plastoquinol/quinone exchange. The proline side chains confer a larger aperture for passage of plastoquinol/quinone. Change of these prolines to alanine in the cyanobacterium Synechococcus sp. PCC 7002 results in attenuation of this rate‐limiting step, observed by a two‐fold reduction in the rate of cell growth, O 2 evolution, and plastoquinol‐mediated reduction of cyt f . This study demonstrates modification by site‐directed mutagenesis of photosynthetic energy transduction based on rational application of information in the atomic structure.

Sponsoring Organization:
USDOE
Grant/Contract Number:
DE‐SC0018238
OSTI ID:
1542522
Journal Information:
FEBS Letters, Journal Name: FEBS Letters Vol. 593 Journal Issue: 16; ISSN 0014-5793
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Netherlands
Language:
English
Citation Metrics:
Cited by: 4 works
Citation information provided by
Web of Science

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