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Angew Chem Int Ed Engl. 2016 Mar 24;55(14):4497-9. doi: 10.1002/anie.201600073. Epub 2016 Feb 29.

Reconstitution of the Cytb5-CytP450 Complex in Nanodiscs for Structural Studies using NMR Spectroscopy.

Author information

1
Department of Chemistry, University of Michigan, Ann Arbor, MI, 48109-1055, USA.
2
Department of Medicinal Chemistry, The Biointerfaces Institute, University of Michigan, North Campus Research Complex, Ann Arbor, MI, 48109, USA.
3
Department of Anesthesiology, University of Michigan and VA Medical Center, Ann Arbor, MI, 48105, USA.
4
Biophysics and Department of Chemistry, University of Michigan, Ann Arbor, MI, 48109-1055, USA. ramamoor@umich.edu.
5
Department of Chemistry, University of Michigan, Ann Arbor, MI, 48109-1055, USA. ramamoor@umich.edu.

Abstract

Cytochrome P450s (P450s) are a superfamily of enzymes responsible for the catalysis of a wide range of substrates. Dynamic interactions between full-length membrane-bound P450 and its redox partner cytochrome b5 (cytb5 ) have been found to be important for the enzymatic activity of P450. However, the stability of the circa 70 kDa membrane-bound complex in model membranes renders high-resolution structural NMR studies particularly difficult. To overcome these challenges, reconstitution of the P450-cytb5 complex in peptide-based nanodiscs, containing no detergents, has been demonstrated, which are characterized by size exclusion chromatography and NMR spectroscopy. In addition, NMR experiments are used to identify the binding interface of the P450-cytb5 complex in the nanodisc. This is the first successful demonstration of a protein-protein complex in a nanodisc using NMR structural studies and should be useful to obtain valuable structural information on membrane-bound protein complexes.

KEYWORDS:

NMR spectroscopy; cytochromes; membrane proteins; nanodiscs; protein-protein interactions

PMID:
26924779
DOI:
10.1002/anie.201600073
[Indexed for MEDLINE]

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