A new heat shock protein that binds nucleic acids.
We describe the isolation of Hsp15, a new, very abundant heat shock protein that binds to DNA and RNA. Hsp15 is well conserved and related to a number of RNA-binding proteins, including ribosomal protein S4, RNA pseudouridine synthase, and tyrosyl-tRNA synthetase. The region shared between these proteins appears to represent a common, but previously unrecognized, RNA binding motif. Filter binding studies showed that Hsp15 binds to a 17-mer single-stranded RNA with a dissociation constant of 9 microM in 22.5 mM Hepes, pH 7. 0, 5 mM MgCl2. A role of Hsp15 in binding nucleic acids puts this protein into a different functional category from that of many other heat shock proteins that act as molecular chaperones or proteases on protein substrates.
Korber
P
P
Department of Biology, University of Michigan, Ann Arbor, Michigan 48109-1048, USA.
Zander
T
T
Herschlag
D
D
Bardwell
J C
JC
D000595:Amino Acid Sequence; D001483:Base Sequence; D002846:Chromatography, Affinity; D003001:Cloning, Molecular; D017124:Conserved Sequence; D004247:DNA / Q000378:metabolism*; D017931:DNA Primers; D004268:DNA-Binding Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D029968:Escherichia coli Proteins; D006360:Heat-Shock Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D008969:Molecular Sequence Data; D011485:Protein Binding; D012313:RNA / Q000378:metabolism*; D016601:RNA-Binding Proteins / Q000737:chemistry / Q000378:metabolism; D017386:Sequence Homology, Amino Acid
D017931:DNA Primers; D004268:DNA-Binding Proteins; D029968:Escherichia coli Proteins; D006360:Heat-Shock Proteins; D016601:RNA-Binding Proteins; C116841:hslR protein, E coli; D012313:RNA; D004247:DNA