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Assignment of the natural abundance 13C spectrum of proteins using 13C 1H-detected heteronuclear multiple-bond correlation NMR spectroscopy: structural information and stereospecific assignments from two- and three-bond carbon-hydrogen coupling constants.

Abstract：

:Proton-detected heteronuclear multiple-bond 1H-13C correlations (HMBC) previously have been used for assignment purposes in a variety of isotopically enriched proteins. In the present study it is demonstrated that the technique yields an almost complete assignment of the natural abundance 13C spectrum of the protein basic pancreatic trypsin inhibitor (BPTI). In addition, the technique permits additional 1H assignments to be made for this well-studied protein. The intensities of observed correlations permit rough estimates to be made of 2J(C,H) and 3J(C,H) coupling constants. These couplings can be used for conformational studies of both the side chains and the backbone. Intra- and interresidue coupling between C alpha H and the carbonyl carbon provides information about the backbone angles psi and phi. Side-chain conformations can be determined from both two- and three-bond carbon-hydrogen coupling constants. The present study of BPTI together with its known high-precision solution structure yields an experimental correlation between resonance intensities and secondary structure. The spectra show the potential of the method in analyzing 13C NMR spectra of nonenriched proteins. The method yields 13C NMR chemical shifts, which are versatile parameters to be used to monitor structural changes, titrations, etc.

journal_name

Biochemistry

journal_title

Biochemistry

authors

Hansen PE

doi

10.1021/bi00107a014

subject

Has Abstract

pub_date

1991-10-29 00:00:00

pages

10457-66

issue

43

eissn

0006-2960

issn

1520-4995

journal_volume

30

pub_type

杂志文章

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