1zx4
From Proteopedia
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Structure of ParB bound to DNA
Overview
The faithful inheritance of genetic information, which is essential for all organisms, requires accurate DNA partition (segregation) at cell division. In prokaryotes, partition is mediated by par systems, for which the P1 plasmid system of Escherichia coli is a prototype comprising a partition site and two proteins, ParA and ParB. To form the partition complex necessary for segregation, P1 ParB must recognize a complicated arrangement of A-box and B-box DNA motifs located on opposite ends of a sharply bent parS partition site of approximately 74 bp (refs 3-7). Here we describe structures of ParB bound to partition sites. ParB forms an asymmetric dimer with extended amino-terminal HTH (helix-turn-helix) domains that contact A-boxes. The two HTH domains emanate from a dimerized DNA-binding module composed of a six-stranded beta-sheet coiled-coil that binds B-boxes. Strikingly, these individual DNA-binding modules rotate freely about a flexible linker, enabling them to contact several arrangements of A- and B-boxes. Most notably, each DNA-binding element binds to and thus bridges adjacent DNA duplexes. These unique structural features of ParB explain how this protein can bind complex arrays of A- and B-box elements on adjacent DNA arms of the looped partition site.
About this Structure
1ZX4 is a Single protein structure of sequence from Enterobacteria phage p21 with as ligand. Full crystallographic information is available from OCA.
Reference
Structures of ParB bound to DNA reveal mechanism of partition complex formation., Schumacher MA, Funnell BE, Nature. 2005 Nov 24;438(7067):516-9. PMID:16306995
Page seeded by OCA on Thu Feb 21 16:19:56 2008
