Use of NMR to study serpin function. Methods 2004 Feb;32(2):120-9
Date
12/31/2003Pubmed ID
14698624DOI
10.1016/s1046-2023(03)00203-2Abstract
Two-dimensional heteronuclear [1H,15N] single quantum correlation NMR spectra of serpins show dramatic changes between native and loop-inserted conformations, making them very sensitive reporters of the serpin conformation. Much of the spectral overlap that arises when all amides are 15N labelled can be removed by use of selective labelling of a single type of amino acid, such as alanine. The method allows ready determination of whether loop insertion is present, and to what extent, as well as providing information on motional freedom of components of the complex and of the reactive center loop. With label introduced separately into the proteinase, information can also be obtained on the conformational changes brought about in that moiety by complex formation. In addition, with the use of cryoprobes, high field spectrometers, TROSY-based signal detection and deuteration, samples as small as 1-2mg can easily be examined, making it applicable to a wide range of serpins, including those that can only be expressed in mammalian cells.
Author List
Gettins PG, Backovic M, Peterson FCAuthor
Francis C. Peterson PhD Professor in the Biochemistry department at Medical College of WisconsinMESH terms used to index this publication - Major topics in bold
AnimalsBinding Sites
Cattle
Isotope Labeling
Nitrogen Isotopes
Nuclear Magnetic Resonance, Biomolecular
Protein Binding
Protons
Recombinant Proteins
Serpins
Trypsin
Trypsin Inhibitors
alpha 1-Antitrypsin
