1krt
From Proteopedia
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SOLUTION STRUCTURE OF THE ANTICODON BINDING DOMAIN OF ESCHERICHIA COLI LYSYL-TRNA SYNTHETASE AND STUDIES OF ITS INTERACTIONS WITH TRNA-LYS
Overview
A protein domain corresponding to residues 31 to 149 of the E. coli, Lysyl-tRNA synthetase species corresponding to the lysS gene was expressed, and 15N-labelled. 1H and 15N NMR resonance assignments for this domain, were obtained by two-dimensional and three-dimensional homonuclear and, heteronuclear spectroscopy. Using distance geometry and simulated, annealing, a three-dimensional structure could be calculated using 701 NOE, and 86 dihedral angle restraints. It is composed of a five-stranded, antiparallel beta-barrel capped by three alpha-helices at its ends. This, structure closely resembles that of the N-terminal domain of the other E., coli lysyl-tRNA synthetase species expressed from the lysU gene and is, highly homologous to the fold observed for the corresponding region of, aspartyl-tRNA synthetase. It is shown that the isolated N-terminal, fragment of lysyl-tRNA synthetase can interact with tRNA(Lys) as well as, with poly (U), which mimics the anticodon sequence. Amino acid residues, involved in these interactions were identified and, in the case of poly-U, a number of specific protein-RNA contacts were characterized. Specific, recognition of tRNA(Lys) involves a cluster of four structurally, well-defined aromatic residues, anchored on the beta-strands, and basic, residues located on the surrounding loops. This organization is, reminiscent of other RNA binding proteins, such as the U1A small nuclear, ribonucleoprotein.
About this Structure
1KRT is a Single protein structure of sequence from Escherichia coli. Active as Lysine--tRNA ligase, with EC number 6.1.1.6 Full crystallographic information is available from OCA.
Reference
Solution structure of the anticodon-binding domain of Escherichia coli lysyl-tRNA synthetase and studies of its interaction with tRNA(Lys)., Commans S, Plateau P, Blanquet S, Dardel F, J Mol Biol. 1995 Oct 13;253(1):100-13. PMID:7473706
Page seeded by OCA on Tue Nov 20 19:46:19 2007
