Metallo-Sulfur Complexes as Models for Electron Transfer Proteins

Paulson, Donald R.

Abstract

The chemistry of metal-dithiolate complexes and metal disulfide complexes will be studied as model systems for metallo-thiolate electron transport proteins such as the ubiquitous iron-sulfur proteins. It is proposed that these metalloproteins can obtain additional reducing power by the formation partial S.S bonds through interaction of two adjacent metal-bound thiolates. Evidence for this hypothesis comes from a number of examples of metal-thiolate complexes where the S.S separations are considerably smaller than the predicted nearest neighbor contact of non-bonded sulfur atoms. Metallosulfur complexes will be synthesized where the dithiolate/disulfide couple is reversible. Dithiolate complexes will be prepared with high-valent metal ions while disulfide complexes will be prepared with low-valent metal ions. The oxidation of the thiolate complexes and the reduction of the disulfide complexes will be studied in order to provide further evidence for the dithiolate/disulfide couple serving as a source of increased reducing power in electron transfer proteins.

Funding Agency

• Agency: National Institute of Health (NIH)
• Institute: National Institute of General Medical Sciences (NIGMS)
• Type: Minority Biomedical Research Support - MBRS (S06)
• Project #: 5S06GM008101-22
• Application #: 3777843
• Support Year: 22
• Fiscal Year: 1993

Institution

• Name: California State University Los Angeles
• City: Los Angeles
• State: CA
• Country: United States
• Zip Code: 90032

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