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Assignment and analysis of fluorine nuclear magnetic resonance spectra of 4-fluorotryptophan myoglobins and hemoglobins.

Abstract：

:We have obtained the 470 MHz 19F NMR spectra of wild type [4-F]Trp-labeled myoglobins (MbCO, MbO2, deoxyMb, metMb, and MbCN) and hemoglobins (HbCO, HbO2, and deoxyHb), as well as those of several mutants (W7F Mb, betaW15F Hb, betaW37S Hb, and betaY130F Hb, all as the carbonmonoxy adducts), prepared via site-directed mutagenesis. The maximum observed chemical shift range induced by folding is 6.4 ppm. Using a multipole shielding polarizability-local reaction field approach, we have computed the electrostatic field contributions to the fluorine shielding. For residues which do not have F atoms in contact with neighboring groups, we find an approximately 1 ppm mean square deviation in shift from experiment, with the R2-like structure of HbCOA being in very close accord with experiment.

journal_name

Biochemistry

journal_title

Biochemistry

authors

Pearson JG,Montez B,Le H,Oldfield E,Chien EY,Sligar SG

doi

10.1021/bi961664h

subject

Has Abstract

pub_date

1997-03-25 00:00:00

pages

3590-9

issue

12

eissn

0006-2960

issn

1520-4995

pii

bi961664h

journal_volume

36

pub_type

杂志文章

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