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Crystallization, microPIXE and preliminary crystallographic analysis of the complex between the third KH domain of hnRNP K and single-stranded DNA



Crystallization, microPIXE and preliminary crystallographic analysis of the complex between the third KH domain of hnRNP K and single-stranded DNA



Acta Crystallographica. Section D Biological Crystallography 60(Pt 4): 784-787



hnRNP K is one of the major proteins found in hnRNP particles which are ribonucleoprotein complexes containing proteins and pre-mRNA. hnRNP K contains hnRNP K homology (KH) domains which bind both CT-rich single-stranded DNA (ssDNA) and CU-rich ssRNA. Co-crystallization of the third KH domain of human hnRNP K with a 15-mer ssDNA gave rod-shaped crystals belonging to the trigonal space group P3(1)21 (unit-cell parameters a = 54.0, c = 149.7 A) and diffracting to 2.4 A resolution. MicroPIXE (proton-induced X-ray emission) experiments showed that the crystals contained the complex and that the phosphorus to sulfur atomic ratio was consistent with the asymmetric unit containing three KH3 domains per 15-mer ssDNA. This was confirmed by structure solution by molecular replacement.

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Accession: 048688849

Download citation: RISBibTeXText

PMID: 15039586

DOI: 10.1107/s0907444904002628


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