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Title:A Thermostable Cytochrome P450 From Sulfolobus Solfataricus
Author(s):Weiss, Kara Elizabeth
Doctoral Committee Chair(s):Sligar, Stephen G.
Department / Program:Biochemistry
Degree Granting Institution:University of Illinois at Urbana-Champaign
Subject(s):Biology, Molecular
Abstract:Crystallographic studies have revealed the placement of conserved key catalytic residues and solvent in the active site that are important in the P450 dioxygen scission reaction. CYP119 is found to display a mobile F-G helix and loop region that undergoes a significant conformational change upon binding of medium and large ligands and may reflect a natural motion independent of ligand binding. The CYP119 porphyrin is non-planar, with a "ruffling" and "saddling" of the porphyrin heterocycle. Additionally, the iron favors an in-plane position, which correlates with the spectroscopic data showing that CYP119 prefers the low-spin conformational state. This favoring of the low-spin state may have an effect on the catalytic properties of CYP119, for example the fast autoxidation rate of the oxyferrous enzyme. The overall protein structure was found to have a unique distribution of charge, which could potentially affect the normal electrostatic interaction with redox partners involved in electron transfer to the P450 cytochromes. The crystal structures of CYP119 indicate that increased stability may be due to a combination of increased factors involved in stabilizing secondary and tertiary structural interactions, such as aromatic stacking, increased salt link networks, short strong hydrogen bonds, and increased secondary structure due to shorter loops. These insights into local and globular protein stability should aid in the optimization of proteins for drug design and bio-organic chemical synthesis.
Issue Date:2003
Description:168 p.
Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2003.
Other Identifier(s):(MiAaPQ)AAI3086212
Date Available in IDEALS:2015-09-25
Date Deposited:2003

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