6533b825fe1ef96bd1282829

RESEARCH PRODUCT

Solution Structure of the R3H Domain from Human Sμbp-2

Edvards LiepinshLaurent GuignardGottfried OttingGottfried OttingAnatoly SharipoAinars Leonchiks

subject

Models MolecularEGF-like domainMolecular Sequence DataProtein domainProkaryotic Initiation Factor-3Immunoglobulin domainStructure-Activity RelationshipBacterial ProteinsStructural BiologyEVH1 domainHumansAmino Acid SequenceB3 domainNuclear Magnetic Resonance BiomolecularMolecular BiologyChemistryEscherichia coli ProteinsDHR1 domainProtein Structure TertiaryDNA-Binding ProteinsSolutionsCrystallographyCyclic nucleotide-binding domainSequence AlignmentTranscription FactorsBinding domain

description

The R3H domain is a conserved sequence motif, identified in over 100 proteins, that is thought to be involved in polynucleotide-binding, including DNA, RNA and single-stranded DNA. In this work the 3D structure of the R3H domain from human Smubp-2 was determined by NMR spectroscopy. It is the first 3D structure determination of an R3H domain. The fold presents a small motif, consisting of a three-stranded antiparallel beta-sheet and two alpha-helices, which is related to the structures of the YhhP protein and the C-terminal domain of the translational initiation factor IF3. The similarities are non-trivial, as the amino acid identities are below 10%. Three conserved basic residues cluster on the same face of the R3H domain and could play a role in nucleic acid recognition. An extended hydrophobic area at a different site of the molecular surface could act as a protein-binding site. A strong correlation between conservation of hydrophobic amino acids and side-chain solvent protection indicates that the structure of the Smubp-2 R3H domain is representative of R3H domains in general.

yearjournalcountryeditionlanguage
2003-02-01Journal of Molecular Biology
https://doi.org/10.1016/s0022-2836(02)01381-5