2okv

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spinqualitylabelsall models 2okv, resolution 2.00Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image

c-Myc DNA Unwinding Element Binding Protein

Overview

Local zones of easily unwound DNA are characteristic of prokaryotic and, eukaryotic replication origins. The DNA-unwinding element of the human, c-myc replication origin is essential for replicator activity and is a, target of the DNA-unwinding element-binding protein DUE-B in vivo. We, present here the 2.0A crystal structure of DUE-B and complementary, biochemical characterization of its biological activity. The structure, corresponds to a dimer of the N-terminal domain of the full-length protein, and contains many of the structural elements of the nucleotide binding, fold. A single magnesium ion resides in the putative active site cavity, which could serve to facilitate ATP hydrolytic activity of this protein., The structure also demonstrates a notable similarity to those of, tRNA-editing enzymes. Consistent with this structural homology, the, N-terminal core of DUE-B is shown to display both d-aminoacyl-tRNA, deacylase activity and ATPase activity. We further demonstrate that the, C-terminal portion of the enzyme is disordered and not essential for, dimerization. However, this region is essential for DNA binding in vitro, and becomes ordered in the presence of DNA.

About this Structure

2OKV is a Single protein structure of sequence from Homo sapiens with as ligand. Full crystallographic information is available from OCA.

Reference

Structure and Function of the c-myc DNA-unwinding Element-binding Protein DUE-B., Kemp M, Bae B, Yu JP, Ghosh M, Leffak M, Nair SK, J Biol Chem. 2007 Apr 6;282(14):10441-10448. Epub 2007 Jan 30. PMID:17264083

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