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J Biol Chem, Vol. 273, Issue 43, 27786-27793, October 23, 1998
From the Division of Molecular Oncology, Department of Pathology,
Brigham and Women's Hospital, Harvard Medical School,
Boston, Massachusetts 02115
A human protein (RUVBL1), consisting of 456 amino
acids (50 kDa) and highly homologous to RuvB, was identified by using
the 14-kDa subunit of replication protein A (hsRPA3) as bait in a yeast
two-hybrid system. RuvB is a bacterial protein involved in genetic
recombination that bears structural similarity to subunits of the RF-C
clamp loader family of proteins. Fluorescence in situ hybridization analysis demonstrated that the RUVBL1 gene is located at
3q21, a region with frequent rearrangements in different types of
leukemia and solid tumors. RUVBL1 co-immunoprecipitated with at least
three other unidentified cellular proteins and was detected in the RNA
polymerase II holoenzyme complex purified over multiple chromatographic
steps. In addition, two yeast homologs, scRUVBL1 and scRUVBL2 with 70 and 42% identity to RUVBL1, respectively, were revealed by screening
the complete Saccharomyces cerevisiae genome sequence.
Yeast with a null mutation in scRUVBL1 was nonviable. Thus RUVBL1 is an
eukaryotic member of the RuvB/clamp loader family of structurally
related proteins from bacteria and eukaryotes that is essential for
viability of yeast.
An Eukaryotic RuvB-like Protein (RUVBL1) Essential for
Growth
Copyright © 1998 by The American Society for Biochemistry and Molecular Biology, Inc.
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