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Titolo:
PISEMA powder patterns and PISA wheels
Autore:
Denny, JK; Wang, JF; Cross, TA; Quine, JR;
Indirizzi:
Mercer Univ, Dept Math, Macon, GA 31207 USA Mercer Univ Macon GA USA 31207 ercer Univ, Dept Math, Macon, GA 31207 USA Florida State Univ, Inst Mol Biophys, Tallahassee, FL 32306 USA Florida State Univ Tallahassee FL USA 32306 ys, Tallahassee, FL 32306 USA Florida State Univ, Dept Chem, Tallahassee, FL 32310 USA Florida State Univ Tallahassee FL USA 32310 em, Tallahassee, FL 32310 USA Florida State Univ, Natl High Magnet Field Lab, Tallahassee, FL 32310 USA Florida State Univ Tallahassee FL USA 32310 ab, Tallahassee, FL 32310 USA Florida State Univ, Dept Math, Tallahassee, FL 32306 USA Florida State Univ Tallahassee FL USA 32306 th, Tallahassee, FL 32306 USA Florida State Univ, Natl High Magnet Field Lab, Tallahassee, FL 32306 USA Florida State Univ Tallahassee FL USA 32306 ab, Tallahassee, FL 32306 USA
Titolo Testata:
JOURNAL OF MAGNETIC RESONANCE
fascicolo: 2, volume: 152, anno: 2001,
pagine: 217 - 226
SICI:
1090-7807(200110)152:2<217:PPPAPW>2.0.ZU;2-0
Fonte:
ISI
Lingua:
ENG
Soggetto:
STATE NMR-SPECTROSCOPY; N-15 CHEMICAL-SHIFT; PROTEIN-STRUCTURE; ORIENTATIONAL CONSTRAINTS; POLYCRYSTALLINE SAMPLES; INTERACTION TENSORS; PEPTIDE-BOND; HELIX TILT; DIPOLAR; SPECTRA;
Keywords:
PISEMA; solid-state NMR; powder pattern; PISA wheel; membrane protein;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Physical, Chemical & Earth Sciences
Citazioni:
26
Recensione:
Indirizzi per estratti:
Indirizzo: Denny, JK Mercer Univ, Dept Math, Macon, GA 31207 USA Mercer Univ Macon GA USA 31207 , Dept Math, Macon, GA 31207 USA
Citazione:
J.K. Denny et al., "PISEMA powder patterns and PISA wheels", J MAGN RES, 152(2), 2001, pp. 217-226

Abstract

Resonance patterns observed in 2D PISEMA (polarization inversion spin exchange at magic angle) spectra from a transmembrane alpha -helix have been demonstrated to yield structural details of the protein. This paper presents a mathematical discussion of the PISEMA powder spectrum as the image in thefrequency plane of a quadratic function from the sphere of unit vectors. The simplicity of this function allows easy calculation of the powder spectrum. Based on this analysis of powder patterns, four degeneracies are discussed which arise in determining possible orientations associated with PISA spectra. This paper also gives parametric equations for PISA wheels, which are specific patterns observed in PISEMA spectra of oriented peptides. Thesewheels are useful both in assigning the resonances and in determining the orientation of the helix with respect to the magnetic field. The union of these PISA wheels gives the entire powder spectrum. (C) 2001 Academic Press.

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Documento generato il 30/03/20 alle ore 20:03:10