1j5k
From Proteopedia
COMPLEX OF THE KH3 DOMAIN OF HNRNP K WITH A SINGLE_STRANDED 10MER DNA OLIGONUCLEOTIDE
Overview
To elucidate the basis of sequence-specific single-stranded (ss) DNA recognition by K homology (KH) domains, we have solved the solution structure of a complex between the KH3 domain of the transcriptional regulator heterogeneous nuclear ribonucleoprotein K (hnRNP K) and a 10mer ssDNA. We show that hnRNP K KH3 specifically recognizes a tetrad of sequence 5'd-TCCC. The complex is stabilized by a dense network of methyl-oxygen hydrogen bonds involving the methyl groups of three isoleucine residues and the O2 and N3 atoms of the two central cytosine bases. Comparison with the recently solved structure of a specific protein-ssDNA complex involving the KH3 and KH4 domains of the far upstream element (FUSE) binding protein FBP suggests that the amino acid located five residues N-terminal of the invariant GXXG motif, which is characteristic of all KH domains, plays a crucial role in discrimination of the first two bases of the tetrad.
About this Structure
1J5K is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.
Reference
Molecular basis of sequence-specific single-stranded DNA recognition by KH domains: solution structure of a complex between hnRNP K KH3 and single-stranded DNA., Braddock DT, Baber JL, Levens D, Clore GM, EMBO J. 2002 Jul 1;21(13):3476-85. PMID:12093748 Page seeded by OCA on Fri May 2 20:49:54 2008
