Nucleic Acids Research, 1995, Vol. 23, No. 24 4986-4991
© 1995
Articles |
Identification of the fifth subunit os Saccharomyces cerevisiae Replication Factor C
Department of Biochemistry and Molecular Biophysics, Washington University School of Medicine 660 South Euclid, St Louis, MO 63110, USA
*To whom correspondence should be addressed
Received October 3, 1995. Accepted October 26, 1995.
Yeast replication factor C (RF-C) is a muttipolypeptide complex required for chromosomal DNA replication. Previously this complex was known to consist of at least four subunits. We here report the Identification of a fifth RF-C subunit from Saccharomyces cerevisiae, encoded by the RFC5 (YBR0810) gene. This subunit exhibits highest homology to the 38 kDa subunit (38%) of human RF-C (activator 1). Like the other four RFC genes, the RFC5 gene Is essential for yeast viability, indicating an essential function for each subunit. RFC5 mRNA is expressed at steady-state levels throughout the mitotic cell cycle. Upon overexpression in Escherichla coli Rfc5p has an apparent molecular mass of 41 kDa. Overproduction of RF-C activity in yeast is dependent on overexpression of the RFC5 gene together with overexpression of the RFC1-4 genes, indicating that the RFC5 gene product forms an integral subunit of this replication factor.
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