1oo9: Difference between revisions
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'''Orientation in Solution of MMP-3 Catalytic Domain and N-TIMP-1 from Residual Dipolar Couplings''' | '''Orientation in Solution of MMP-3 Catalytic Domain and N-TIMP-1 from Residual Dipolar Couplings''' | ||
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[[Category: Arumugam, S.]] | [[Category: Arumugam, S.]] | ||
[[Category: Doren, S R.Van.]] | [[Category: Doren, S R.Van.]] | ||
[[Category: | [[Category: Protein-protein complex]] | ||
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 04:05:42 2008'' | |||
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Revision as of 04:05, 3 May 2008
Orientation in Solution of MMP-3 Catalytic Domain and N-TIMP-1 from Residual Dipolar Couplings
OverviewOverview
Crystal structures of catalytic domains of MMP-3 and MT1-MMP bound to TIMP-1 or TIMP-2, respectively, differ in the orientation of the TIMP in the MMP active site. The orientation in solution of N-TIMP-1 in the MMP-3 active site has been investigated using residual dipolar couplings (RDCs). Fitting of the RDCs to the X-ray structures of the complexes suggests general agreement with the orientation of crystalline MMP-3(DeltaC) and TIMP-1 and a large disparity from the orientation of crystalline MT1-MMP(DeltaC) and TIMP-2. Rigid body docking of MMP-3 and N-TIMP-1 X-ray coordinates using RDCs and intermolecular NOEs provided a time-averaged orientation in solution differing from the crystal structure by a 5 degrees rotation toward the MT1-MMP(DeltaC)/TIMP-2 orientation. The slight discrepancy in orientations in solution and crystal lies within the experimental uncertainties. Intermolecular NOEs used in the docking corroborated the accuracy of mapping the interface by a paramagnetic NMR footprinting assay, a potential alternative source of contacts for docking. Some uncertainty in the N-TIMP-1 orientation in the MMP-3 active site, coupled with microsecond to millisecond fluctuations of the MMP-binding ridge of N-TIMP-1 in the complex and flexibility in MMP-3(DeltaC) S(1)' to S(3)' subsites, leaves open the possibility that N-TIMP-1 might dynamically pivot a few degrees or more in the arc toward the MT1-MMP(DeltaC)/TIMP-2 orientation. Differing TIMP orientations in MMP active sites are more likely to result from structural differences in TIMP AB hairpin loops than from crystal packing artifacts.
About this StructureAbout this Structure
1OO9 is a Protein complex structure of sequences from Homo sapiens. Full crystallographic information is available from OCA.
ReferenceReference
Global orientation of bound MMP-3 and N-TIMP-1 in solution via residual dipolar couplings., Arumugam S, Van Doren SR, Biochemistry. 2003 Jul 8;42(26):7950-8. PMID:12834347 Page seeded by OCA on Sat May 3 04:05:42 2008