Fast NMR Data Acquisition from Bicelles Containing a Membrane-associated Peptide at Natural-abundance

Overview

Journal J Phys Chem B

Publisher American Chemical Society

Specialty Chemistry

Date 2011 Sep 24

PMID 21939237

Citations 15

Authors

Kazutoshi Yamamoto

Subramanian Vivekanandan

Ayyalusamy Ramamoorthy

Affiliations

Soon will be listed here.

Abstract

In spite of recent technological advances in NMR spectroscopy, its low sensitivity continues to be a major limitation particularly for the structural studies of membrane proteins. The need for a large quantity of a membrane protein and acquisition of NMR data for a long duration are not desirable. Therefore, there is considerable interest in the development of methods to speed up the NMR data acquisition from model membrane samples. In this study, we demonstrate the feasibility of acquiring two-dimensional spectra of an antimicrobial peptide (MSI-78; also known as pexiganan) embedded in isotropic bicelles using natural-abundance (15)N nuclei. A copper-chelated lipid embedded in bicelles is used to speed-up the spin-lattice relaxation of protons without affecting the spectral resolution and thus enabling fast data acquisition. Our results suggest that even a 2D SOFAST-HMQC spectrum can be obtained four times faster using a very small amount (∼3 mM) of a copper-chelated lipid. These results demonstrate that this approach will be useful in the structural studies of membrane-associated peptides and proteins without the need for isotopic enrichment for solution NMR studies.

Citing Articles

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Lipid-nanodiscs formed by paramagnetic metal chelated polymer for fast NMR data acquisition.

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Metal-Chelated Polymer Nanodiscs for NMR Studies.

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Use of paramagnetic systems to speed-up NMR data acquisition and for structural and dynamic studies.

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