The main objective of the proposed research is to determine the structure of a 16.7 kDa membrane-associated cytochrome-b5, an electron transfer protein found in a variety of cell types. It plays a major role in the catalytic activity of cytochrome-P450, which metabolizes more than 50% of the drugs in clinical use today. It is also involved as an electron transfer component in a number of oxidative reactions in biological tissues, which includes the anabolic metabolism of fats and steroids. It presents significant challenges for experimental techniques of protein structure determination. However, structure determination of membrane proteins by NMR spectroscopy is in a rapid phase of development;recent results on several membrane proteins are promising and indicate that the structure determination of cytochrome-b5 is feasible. The structure of cytochrome-b5 will be determined in micelles by solution NMR and in lipid bilayers by solid state NMR techniques. Structures obtained in free and in complexation with cytochrome-P450 will provide insights into the molecular mechanism by which cytochrome-b5 influences the catalysis of cytochrome-P450.

Public Health Relevance

The outcome of the proposed structural studies on cytochrome-b5 will provide insights into molecular mechanism by which cytochrome-b5 influences oxidation by cytochrome- P450 that metabolizes more than 50% of current-day drugs. These studies will also enable us to understand the role of cytochrome-b5 in the biosynthesis of testosterone and numerous unsaturated lipids, which are necessary for maintaining the integrity of cellular membranes.

Agency
National Institute of Health (NIH)
Institute
National Institute of General Medical Sciences (NIGMS)
Type
Research Project (R01)
Project #
5R01GM084018-02
Application #
7745467
Study Section
Biochemistry and Biophysics of Membranes Study Section (BBM)
Program Officer
Okita, Richard T
Project Start
2009-01-01
Project End
2012-11-30
Budget Start
2009-12-01
Budget End
2010-11-30
Support Year
2
Fiscal Year
2010
Total Cost
$408,325
Indirect Cost
Name
University of Michigan Ann Arbor
Department
Biophysics
Type
Schools of Arts and Sciences
DUNS #
073133571
City
Ann Arbor
State
MI
Country
United States
Zip Code
48109
Damron, Joshua T; Ma, Jialiu; Kurz, Ricardo et al. (2018) The Influence of Chemical Modification on Linker Rotational Dynamics in Metal-Organic Frameworks. Angew Chem Int Ed Engl 57:8678-8681
Ravula, Thirupathi; Hardin, Nathaniel Z; Bai, Jia et al. (2018) Effect of polymer charge on functional reconstitution of membrane proteins in polymer nanodiscs. Chem Commun (Camb) 54:9615-9618
Ravula, Thirupathi; Hardin, Nathaniel Z; Ramadugu, Sudheer Kumar et al. (2018) Formation of pH-Resistant Monodispersed Polymer-Lipid Nanodiscs. Angew Chem Int Ed Engl 57:1342-1345
Barnaba, Carlo; Sahoo, Bikash Ranjan; Ravula, Thirupathi et al. (2018) Cytochrome-P450-Induced Ordering of Microsomal Membranes Modulates Affinity for Drugs. Angew Chem Int Ed Engl 57:3391-3395
Gentry, Katherine A; Zhang, Meng; Im, Sang-Choul et al. (2018) Substrate mediated redox partner selectivity of cytochrome P450. Chem Commun (Camb) 54:5780-5783
Prade, Elke; Mahajan, Mukesh; Im, Sang-Choul et al. (2018) A Minimal Functional Complex of Cytochrome P450 and FBD of Cytochrome P450 Reductase in Nanodiscs. Angew Chem Int Ed Engl 57:8458-8462
Barnaba, Carlo; Ravula, Thirupathi; Medina-Meza, Ilce G et al. (2018) Lipid-exchange in nanodiscs discloses membrane boundaries of cytochrome-P450 reductase. Chem Commun (Camb) 54:6336-6339
Naito, Akira; Matsumori, Nobuaki; Ramamoorthy, Ayyalusamy (2018) Dynamic membrane interactions of antibacterial and antifungal biomolecules, and amyloid peptides, revealed by solid-state NMR spectroscopy. Biochim Biophys Acta Gen Subj 1862:307-323
Damron, Joshua T; Kersten, Kortney M; Pandey, Manoj Kumar et al. (2017) Electrostatic Constraints Assessed by 1H MAS NMR Illuminate Differences in Crystalline Polymorphs. J Phys Chem Lett 8:4253-4257
Yamamoto, Kazutoshi; Caporini, Marc A; Im, Sang-Choul et al. (2017) Transmembrane Interactions of Full-length Mammalian Bitopic Cytochrome-P450-Cytochrome-b5 Complex in Lipid Bilayers Revealed by Sensitivity-Enhanced Dynamic Nuclear Polarization Solid-state NMR Spectroscopy. Sci Rep 7:4116

Showing the most recent 10 out of 94 publications