2wmm
Crystal structure of the hinge domain of MukB
Structural highlights
FunctionMUKB_ECOLI Plays a central role in chromosome condensation, segregation and cell cycle progression. Functions as a homodimer, which is essential for chromosome partition. Involved in negative DNA supercoiling in vivo, and by this means organizes and compacts chromosomes. May achieve or facilitate chromosome segregation by condensation of DNA from both sides of a centrally located replisome during cell division. Stimulates both DNA relaxation and to a lesser extent decatenation activity of topoisomerase IV.[1] [2] 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 structural maintenance of chromosomes (SMC) family proteins are commonly found in the multiprotein complexes involved in chromosome organization, including chromosome condensation and sister chromatid cohesion. These proteins are characterized by forming a V-shaped homo- or heterodimeric structure with two long coiled-coil arms having two ATPase head domains at the distal ends. The hinge domain, located in the middle of the coiled coil, forms the dimer interface. In addition to being the dimerization module, SMC hinges appear to play other roles, including the gateway function for DNA entry into the cohesin complex. Herein, we report the homodimeric structure of the hinge domain of Escherichia coli MukB, which forms a prokaryotic condensin complex with two non-SMC subunits, MukE and MukF. In contrast with SMC hinge of Thermotoga maritima which has a sizable central hole at the dimer interface, MukB hinge forms a constricted dimer interface lacking a hole. Under our assay conditions, MukB hinge does not interact with DNA in accordance with the absence of a notable positively charged surface patch. The function of MukB hinge appears to be limited to dimerization of two copies of MukB molecules. Proteins 2010. (c) 2009 Wiley-Liss, Inc. Crystal structure of the MukB hinge domain with coiled-coil stretches and its functional implications.,Ku B, Lim JH, Shin HC, Shin SY, Oh BH Proteins. 2009 Nov 24. PMID:20034111[3] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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