ISSN:
1573-5001
Keywords:
Interleukin-6
;
Secondary structure
;
Topology
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
,
Chemistry and Pharmacology
Notes:
Summary Essentially complete backbone and side-chain 1H, 15N and 13C resonance assignments for the 185-aminoacid cytokine interleukin-6 (IL-6) are presented. NMR experiments were performed on uniformly [15N]-and [15N, 13C]-labeled recombinant human IL-6 (rIL-6) using a variety of heteronuclear NMR experiments. A combination of 13C-chemical shift, amide hydrogen-bond exchange, and 15N-edited NOESY data allowed for analysis of the secondary structure of IL-6. The observed secondary structure of IL-6 is composed of loop regions connecting five α-helices, four of which are consistent in their length and disposition with the four-helix bundle motif present in other related cytokines and previously postulated for IL-6. In addition, the topology of the overall fold was found to be consistent with a left-handed up-up-down-down four-helix bundle based on a number of long-range interhelical NOEs. The results presented here provide deeper insight into structure-function relationships among members of the four-helix bundle family of proteins.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00211159
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