A structure/function investigation into baboon cytochrome P450 side-chain cleavage (CYP11A1)

Storbeck, Karl-Heinz (2005-12)

Thesis (MSc (Biochemistry))--University of Stellenbosch, 2005.

Thesis

This study describes: 1. The cloning of baboon cytochrome P450 side-chain cleavage (CYP11A1) cDNA by in vitro site-directed mutagenesis. 2. The identification and sequencing of three baboon CYP11A1 mutants: CYP11A1a, CYP11A1b and CYP11A1c. 3. The expression and characterisation of baboon and human CYP11A1 cDNA, CYP11A1a, CYP11A1b and CYP11A1c in nonsteroidogenic COS-1 cells. The Km and V-values for the metabolism of 25-hydroxycholesterol were determined. 4. The construction of the first homology model of CYP11A1, using both mammalian (CYP2C5) and bacterial (CYP102) cytochromes P450 crystal structures as templates. 5. A structure/function study into the role of the amino acid residues Ile98, Lys103 and Thr291 in substrate binding and enzymatic activity. 6. The proposal of a topological model of the CYP11A1 active pocket as determined by substrate docking studies.

Please refer to this item in SUNScholar by using the following persistent URL: http://hdl.handle.net/10019.1/3113
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