Nucleic Acids Research, Vol 26, Issue 7 1834-1840, Copyright © 1998 by Oxford University Press
SM Cerritelli, OY Fedoroff, BR Reid and RJ Crouch
Eukaryotic RNases H from Saccharomyces cerevisiae , Schizosaccharomyces
pombe and Crithidia fasciculata , unlike the related Escherichia coli RNase
HI, contain a non-RNase H domain with a common motif. Previously we showed
that S.cerevisiae RNase H1 binds to duplex RNAs (either RNA- DNA hybrids or
double-stranded RNA) through a region related to the double-stranded RNA
binding motif. A very similar amino acid sequence is present in
caulimovirus ORF VI proteins. The hallmark of the RNase H/caulimovirus
nucleic acid binding motif is a stretch of 40 amino acids with 11 highly
conserved residues, seven of which are aromatic. Point mutations,
insertions and deletions indicated that integrity of the motif is important
for binding. However, additional amino acids are required because a minimal
peptide containing the motif was disordered in solution and failed to bind
to duplex RNAs, whereas a longer protein bound well. Schizosaccharomyces
pombe RNase H1 also bound to duplex RNAs, as did proteins in which the
S.cerevisiae RNase H1 binding motif was replaced by either the
C.fasciculata or by the cauliflower mosaic virus ORF VI sequence. The
similarity between the RNase H and the caulimovirus domain suggest a common
interaction with duplex RNAs of these two different groups of proteins.
ARTICLES
A common 40 amino acid motif in eukaryotic RNases H1 and caulimovirus ORF VI proteins binds to duplex RNAs
Laboratory of Molecular Genetics, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD 20892, USA.
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