1B50

NMR STRUCTURE OF HUMAN MIP-1A D26A, 10 STRUCTURES

1B50 の概要

• エントリーDOI: 10.2210/pdb1b50/pdb
• 分子名称: MIP-1A (1 entity in total)
• 機能のキーワード: chemokine, cytokine, chemotaxis
• 由来する生物種: Homo sapiens (human)
• 細胞内の位置: Secreted: P10147
• タンパク質・核酸の鎖数: 2
• 化学式量合計: 15357.15

構造登録者

Waltho, J.P.,Higgins, L.D.,Craven, C.J.,Tan, P.,Dudgeon, T. (登録日: 1999-01-11, 公開日: 1999-07-22, 最終更新日: 2024-10-23)

主引用文献

Czaplewski, L.G.,McKeating, J.,Craven, C.J.,Higgins, L.D.,Appay, V.,Brown, A.,Dudgeon, T.,Howard, L.A.,Meyers, T.,Owen, J.,Palan, S.R.,Tan, P.,Wilson, G.,Woods, N.R.,Heyworth, C.M.,Lord, B.I.,Brotherton, D.,Christison, R.,Craig, S.,Cribbes, S.,Edwards, R.M.,Evans, S.J.,Gilbert, R.,Morgan, P.,Randle, E.,Schofield, N.,Varley, P.G.,Fisher, J.,Waltho, J.P.,Hunter, M.G.
Identification of amino acid residues critical for aggregation of human CC chemokines macrophage inflammatory protein (MIP)-1alpha, MIP-1beta, and RANTES. Characterization of active disaggregated chemokine variants.
J.Biol.Chem., 274:16077-16084, 1999

PubMed Abstract: Human CC chemokines macrophage inflammatory protein (MIP)-1alpha, MIP-1beta, and RANTES (regulated on activation normal T cell expressed) self-associate to form high-molecular mass aggregates. To explore the biological significance of chemokine aggregation, nonaggregating variants were sought. The phenotypes of 105 hMIP-1alpha variants generated by systematic mutagenesis and expression in yeast were determined. hMIP-1alpha residues Asp26 and Glu66 were critical to the self-association process. Substitution at either residue resulted in the formation of essentially homogenous tetramers at 0.5 mg/ml. Substitution of identical or analogous residues in homologous positions in both hMIP-1beta and RANTES demonstrated that they were also critical to aggregation. Our analysis suggests that a single charged residue at either position 26 or 66 is insufficient to support extensive aggregation and that two charged residues must be present. Solution of the three-dimensional NMR structure of hMIP-1alpha has enabled comparison of these residues in hMIP-1beta and RANTES. Aggregated and disaggregated forms of hMIP-1alpha, hMIP-1beta, and RANTES generally have equivalent G-protein-coupled receptor-mediated biological potencies. We have therefore generated novel reagents to evaluate the role of hMIP-1alpha, hMIP-1beta, and RANTES aggregation in vitro and in vivo. The disaggregated chemokines retained their human immunodeficiency virus (HIV) inhibitory activities. Surprisingly, high concentrations of RANTES, but not disaggregated RANTES variants, enhanced infection of cells by both M- and T-tropic HIV isolates/strains. This observation has important implications for potential therapeutic uses of chemokines implying that disaggregated forms may be necessary for safe clinical investigation.

PubMed: 10347159
DOI: 10.1074/jbc.274.23.16077

実験手法

SOLUTION NMR