2ayk
From Proteopedia
INHIBITOR-FREE CATALYTIC FRAGMENT OF HUMAN FIBROBLAST COLLAGENASE, NMR, MINIMIZED AVERAGE STRUCTURE
Structural highlights
Function[MMP1_HUMAN] Cleaves collagens of types I, II, and III at one site in the helical domain. Also cleaves collagens of types VII and X. In case of HIV infection, interacts and cleaves the secreted viral Tat protein, leading to a decrease in neuronal Tat's mediated neurotoxicity.[1] Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedThe high-resolution solution structure of the inhibitor-free catalytic fragment of human fibroblast collagenase (MMP-1), a protein of 18.7 kDa, which is a member of the matrix metalloproteinase family, has been determined using three-dimensional heteronuclear NMR spectroscopy. A total of 30 structures were calculated by means of hybrid distance geometry-simulated annealing using a total of 3333 experimental NMR restraints, consisting of 2409 approximate interproton distance restraints, 84 distance restraints for 42 backbone hydrogen bonds, 426 torsion angle restraints, 125 3JNH alpha restraints, 153 C alpha restraints, and 136 C beta restraints. The atomic rms distribution about the mean coordinate positions for the 30 structures for residues 7-137 and 145-163 is 0.42 +/- 0.04 A for the backbone atoms, 0.80 +/- 0.04 A for all atoms, and 0.50 +/- 0.03 A for all atoms excluding disordered side chains. The overall structure of MMP-1 is composed of a beta-sheet consisting of five beta-strands in a mixed parallel and anti-parallel arrangement and three alpha-helices. A best-fit superposition of the NMR structure of inhibitor-free MMP-1 with the 1.56 A resolution X-ray structure by Spurlino et al. [Spurlino, J. C., Smallwood, A. M., Carlton, D. D., Banks, T. M., Vavra, K. J., Johnson, J. S., Cook, E. R., Falvo, J., and Wahl, R. C., et al. (1994) Proteins: Struct., Funct., Genet. 19, 98-109] complexed with a hydroxamate inhibitor yields a backbone atomic rms difference of 1.22 A. The majority of differences between the NMR and X-ray structure occur in the vicinity of the active site for MMP-1. This includes an increase in mobility for residues 138-144 and a displacement for the Ca(2+)-loop (residues 74-80). Distinct differences were observed for side-chain torsion angles, in particular, the chi 1 for N80 is -60 degrees in the NMR structure compared to 180 degrees in the X-ray. This results in the side chain of N80 occupying and partially blocking access to the active site of MMP-1. High-resolution solution structure of the inhibitor-free catalytic fragment of human fibroblast collagenase determined by multidimensional NMR.,Moy FJ, Chanda PK, Cosmi S, Pisano MR, Urbano C, Wilhelm J, Powers R Biochemistry. 1998 Feb 10;37(6):1495-504. PMID:9484219[2] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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