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SOLUTION STRUCTURE OF MURINE MACROPHAGE INFLAMMATORY PROTEIN-2, NMR, 20 STRUCTURES

Overview

The solution structure of murine macrophage inflammatory protein-2, (MIP-2), a heparin-binding chemokine that is secreted in response to, inflammatory stimuli, has been determined using two-dimensional, homonuclear and heteronuclear NMR spectroscopy. Structure calculations, were carried out by means of torsion-angle molecular dynamics using the, program X-PLOR. The structure is based on a total of 2390 experimental, restraints, comprising 2246 NOE-derived distance restraints, 44 distance, restraints for 22 hydrogen bonds, and 100 torsion angle restraints. The, structure is well-defined, with the backbone (N, Calpha, C) and heavy atom, atomic rms distribution about the mean coordinates for residues 9-69 of, the dimer being 0.57 +/- 0.16 A and 0.96 +/- 0.12 A, respectively. The N-, and C-terminal residues (1-8 and 70-73, respectively) are disordered. The, overall structure of the MIP-2 dimer is similar to that reported, previously for the NMR structures of MGSA and IL-8 and consists of a, six-stranded antiparallel beta-sheet (residue 25-29, 39-44, and 48-52), packed against two C-terminal antiparallel alpha-helices. A best fit, superposition of the NMR structure of MIP-2 on the structures of MGSA, NAP-2, and the NMR and X-ray structures of IL-8 are 1.11, 1.02, 1.27, and, 1.19 A, respectively, for the monomers, and 1.28, 1.10, 1.55, and 1.36 A, respectively, for the dimers (IL-8 residues 7-14 and 16-67, NAP-2 residues, 25-84). At the tertiary level, the main differences between the MIP-2, solution structure and the IL-8, MGSA, and NAP-2 structures involve the, N-terminal loop between residues 9-23 and the loops formed by residues, 30-38 and residues 53-58. At the quaternary level, the difference between, MIP-2 and IL-8, MGSA, or NAP-2 results from differing interhelical angles, and separations.

About this Structure

1MI2 is a Single protein structure of sequence from Mus musculus. Full crystallographic information is available from OCA.

Reference

Solution structure of murine macrophage inflammatory protein-2., Shao W, Jerva LF, West J, Lolis E, Schweitzer BI, Biochemistry. 1998 Jun 9;37(23):8303-13. PMID:9622482

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