Crystal structures of novel non-peptidic, non-zinc chelating inhibitors bound to MMP-12.
Human macrophage elastase (MMP-12) plays an important role in inflammatory processes and has been implicated in diseases such as emphysema and chronic obstructive pulmonary disease (COPD). It is therefore an attractive target for therapeutic agents. As part of a structure-based drug design programme to find new inhibitors of MMP-12, the crystal structures of the MMP-12 catalytic domain (residues 106-268) complexed to three different non-peptidic small molecule inhibitors have been determined. The structures reveal that all three ligands bind in the S1' pocket but show varying degrees of interaction with the Zn atom. The structures of the complexes with inhibitors CP-271485 and PF-00356231 reveal that their central morpholinone and thiophene rings, respectively, sit over the Zn atom at a distance of approximately 5A, locating the inhibitors halfway down the S1' pocket. In both of these structures, an acetohydroxamate anion, an artefact of the crystallisation solution, chelates the zinc atom. By contrast, the acetohydroxamate anion is displaced by the ligand in the structure of MMP-12 complexed to PD-0359601 (Bayer), a potent zinc chelating N-substituted biaryl butyric acid, used as a reference compound for crystallisation. Although a racemate was used for the crystallisation, the S enantiomer only is bound in the crystal. Important hydrophobic interactions between the inhibitors and residues from the S1' pocket are observed in all of the structures. The relative selectivity displayed by these ligands for MMP-12 over other MMP family members is discussed.
Morales
Renaud
R
Pfizer Global Research and Development, Fresnes Laboratories, 94265 Fresnes Cedex, France [corrected]
Perrier
Sophie
S
Florent
Jean-Michel
JM
Beltra
Joel
J
Dufour
Sylvie
S
De Mendez
Isabelle
I
Manceau
Peggy
P
Tertre
Anita
A
Moreau
François
F
Compere
Delphine
D
Dublanchet
Anne-Claude
AC
O'Gara
Margaret
M
D001483:Base Sequence; D002614:Chelating Agents / Q000737:chemistry* / Q000378:metabolism; D018360:Crystallography, X-Ray; D017931:DNA Primers; D019281:Dimerization; D004791:Enzyme Inhibitors / Q000737:chemistry* / Q000378:metabolism; D061965:Matrix Metalloproteinase Inhibitors; D020782:Matrix Metalloproteinases / Q000378:metabolism*; D015032:Zinc / Q000737:chemistry
D002614:Chelating Agents; D017931:DNA Primers; D004791:Enzyme Inhibitors; D061965:Matrix Metalloproteinase Inhibitors; D020782:Matrix Metalloproteinases; D015032:Zinc