MT1-MMP-TIMP-1 complex: Difference between revisions

The human matrix metalloproteinases (MMPs) family comprises a large group of structurally homologous zinc-dependent endopeptidases (''e.g.'' <scene name='MT1-MMP-TIMP-1_complex/Cv2/9'>membrane type-1 matrix metalloproteinase (MT1-MMP)</scene> <font color='darkmagenta'><b>(darkmagenta)</b></font> and <scene name='MT1-MMP-TIMP-1_complex/Cv/9'>membrane type-3 matrix metalloproteinase (MT3-MMP)</scene> <font color='magenta'><b>(magenta)</b></font>, <scene name='MT1-MMP-TIMP-1_complex/Cv2/10'>click to see structural comparison</scene>) that perform a wide variety of biological roles. The MMPs are in general inhibited unselectively by all 4 known tissue inhibitors of metalloproteinases (TIMPs 1-4). Currently, 4 TIMPs variants that are 40-50% identical in sequence have been identified, namely TIMPs-1-4. In general, the MMPs are  inhibited unselectively by all 4 known TIMPs 1-4. For example, <scene name='MT1-MMP-TIMP-1_complex/Cv/9'>membrane type-3 matrix metalloproteinase (MT3-MMP)</scene> can form complex with <scene name='MT1-MMP-TIMP-1_complex/Cv/12'>wild-type TIMP-1</scene> ([[1uea]], <font color='orange'><b>colored orange</b></font>). <scene name='MT1-MMP-TIMP-1_complex/Cv/13'>The WT-TIMP-1 binding interface</scene> <font color='cyan'><b>(cyan)</b></font> is mainly composed of the N-terminal segment that approaches the active site, the AB loop (Thr33-Tyr35), the CD loop (Ala65-Cys70), and the EF loop (Thr97-Ser100). The pivotal residue, threonine 98 (Thr98), is shown as <font color='red'><b>red sticks</b></font>. In general, <scene name='MT1-MMP-TIMP-1_complex/Cv1/2'>five main chain hydrogen bonds</scene> (Cys1-Ser68, Val69-Met66, Gly71-Met66, Cys70-Glu67, and Cys70-Thr98) are intimately involved in the conformational stability of TIMP binding interface when bound to MMP.