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1H, 15N, 13C, and 13CO assignments of human interleukin-4 using three-dimensional double- and triple-resonance heteronuclear magnetic resonance spectroscopy.

Abstract：

:The assignment of the 1H, 15N, 13CO, and 13C resonances of recombinant human interleukin-4 (IL-4), a protein of 133 residues and molecular mass of 15.4 kDa, is presented based on a series of 11 three-dimensional (3D) double- and triple-resonance heteronuclear NMR experiments. These studies employ uniformly labeled 15N- and 15N/13C-labeled IL-4 with an isotope incorporation of greater than 95% for the protein expressed in yeast. Five independent sequential connectivity pathways via one-, two-, and three-bond heteronuclear J couplings are exploited to obtain unambiguous sequential assignments. Specifically, CO(i)-N(i + 1),NH(i + 1) correlations are observed in the HNCO experiment, the C alpha H(i), C alpha (i)-N(i + 1) correlations in the HCA(CO)N experiment, the C alpha(i)-N(i + 1),NH(i + 1) correlations in the HNCA and HN(CO)CA experiments, the C alpha H(i)-N(i + 1),NH(i + 1) correlations in the H(CA)NH and HN(CO)HB experiments, and the C beta H(i)-N(i + 1),NH(i + 1) correlations in the HN(CO)HB experiments. The backbone intraresidue C alpha H(i)-15N(i)-NH(i) correlations are provided by the 15N-edited Hartmann-Hahn (HOHAHA) and H(CA)NH experiments, the C beta H(i)-15N(i)-NH(i) correlations by the 15N-edited HOHAHA and HNHB experiments, the 13C alpha(i)-15N(i)-NH(i) correlations by the HNCA experiment, and the C alpha H(i)-13C alpha(i)-13CO(i) correlations by the HCACO experiment. Aliphatic side-chain spin systems are assigned by 3D 1H-13C-13C-1H correlated (HCCH-COSY) and total correlated (HCCH-TOCSY) spectroscopy. Because of the high resolution afforded by these experiments, as well as the availability of multiple sequential connectivity pathways, ambiguities associated with the limited chemical shift dispersion associated with helical proteins are readily resolved. Further, in the majority of cases (88%), four or more sequential correlations are observed between successive residues. Consequently, the interpretation of these experiments readily lends itself to semiautomated analysis which significantly simplifies and speeds up the assignment process. The assignments presented in this paper provide the essential basis for studies aimed at determining the high-resolution three-dimensional structure of IL-4 in solution.

journal_name

Biochemistry

journal_title

Biochemistry

authors

Powers R,Garrett DS,March CJ,Frieden EA,Gronenborn AM,Clore GM

doi

10.1021/bi00132a026

subject

Has Abstract

pub_date

1992-05-05 00:00:00

pages

4334-46

issue

17

eissn

0006-2960

issn

1520-4995

journal_volume

31

pub_type

杂志文章

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