Molecular and General Genetics MGG

, Volume 260, Issue 2, pp 242–250

The MCM16 gene of the yeast Saccharomyces cerevisiae is required for chromosome segregation

Authors

  • K. Sanyal
    • Department of Biochemistry Bose Institute, P1/12 C.I.T Scheme VII M Calcutta 700 054, India e-mail: pratima@boseinst.ernet.in; Fax: +91-33-3343886
  • S. K. Ghosh
    • Department of Biochemistry Bose Institute, P1/12 C.I.T Scheme VII M Calcutta 700 054, India e-mail: pratima@boseinst.ernet.in; Fax: +91-33-3343886
  • P. Sinha
    • Department of Biochemistry Bose Institute, P1/12 C.I.T Scheme VII M Calcutta 700 054, India e-mail: pratima@boseinst.ernet.in; Fax: +91-33-3343886
ORIGINAL PAPER

DOI: 10.1007/s004380050892

Cite this article as:
Sanyal, K., Ghosh, S. & Sinha, P. Mol Gen Genet (1998) 260: 242. doi:10.1007/s004380050892

Abstract

We have cloned and characterized the MCM16 gene required for the maintenance of minichromosomes in the yeast Saccharomyces cerevisiae. This gene corresponds to a 181-amino acid ORF, YPR046W, on chromosome XVI. Mutant cells carrying minichromosomes accumulate them in higher copy numbers than do wild-type cells. Intact dicentric plasmid could be recovered from the mutant, in contrast to the wild-type, in which the plasmid suffered frequent deletions. A wild-type centromere, CEN6, acts as a block to the transcription of a reporter gene, such as β-galactosidase. This block was less effective in the mutant than in the wild-type strain, suggesting alterations in kinetochore assembly in the former. The mutant also showed increased sensitivity to the antimitotic drugs benomyl and thiabendazole. The mcm16 mutation caused a high rate of loss of chromosome III, without any significant increase in the recombination frequency. A strain carrying a deletion-disruption derivative of the MCM16 gene was viable and, when compared to the wild-type, did not show any significant changes in growth rate or cell morphology at 16, 23 and 37° C. These properties show that MCM16 is required for an important but non-essential role that governs the kinetochore-microtubule mediated process of chromosome segregation.

Key words YeastmcmYPR046WChromosome segregationKinetochore

Copyright information

© Springer-Verlag Berlin Heidelberg 1998