3r9j
From Proteopedia
4.3A resolution structure of a MinD-MinE(I24N) protein complex
Structural highlights
Function[MIND_ECOLI] ATPase required for the correct placement of the division site. Cell division inhibitors MinC and MinD act in concert to form an inhibitor capable of blocking formation of the polar Z ring septums. Rapidly oscillates between the poles of the cell to destabilize FtsZ filaments that have formed before they mature into polar Z rings.[1] [2] [MINE_ECOLI] Prevents the cell division inhibition by proteins MinC and MinD at internal division sites while permitting inhibition at polar sites. This ensures cell division at the proper site by restricting the formation of a division septum at the midpoint of the long axis of the cell.[3] Publication Abstract from PubMedIn E. coli, MinD recruits MinE to the membrane, leading to a coupled oscillation required for spatial regulation of the cytokinetic Z ring. How these proteins interact, however, is not clear because the MinD-binding regions of MinE are sequestered within a six-stranded beta sheet and masked by N-terminal helices. minE mutations that restore interaction between some MinD and MinE mutants were isolated. These mutations alter the MinE structure leading to release of the MinD-binding regions and the N-terminal helices that bind the membrane. Crystallization of MinD-MinE complexes revealed a four-stranded beta sheet MinE dimer with the released beta strands (MinD-binding regions) converted to alpha helices bound to MinD dimers. These results identify the MinD-dependent conformational changes in MinE that convert it from a latent to an active form and lead to a model of how MinE persists at the MinD-membrane surface. PAPERFLICK: The Min Oscillator Uses MinD-Dependent Conformational Changes in MinE to Spatially Regulate Cytokinesis.,Park KT, Wu W, Battaile KP, Lovell S, Holyoak T, Lutkenhaus J Cell. 2011 Aug 5;146(3):396-407. PMID:21816275[4] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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