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Identification and characterisation of structural maintenance of chromosome 1 (smc1) mutants of Coprinopsis cinerea.

Authors
  • Muraguchi, Hajime
  • Abe, Kousuke
  • Nakagawa, Minako
  • Nakamura, Kiyoto
  • Yanagi, Sonoe O
Type
Published Article
Journal
Molecular Genetics and Genomics
Publisher
Springer-Verlag
Publication Date
Sep 01, 2008
Volume
280
Issue
3
Pages
223–232
Identifiers
DOI: 10.1007/s00438-008-0358-x
PMID: 18594865
Source
Medline
License
Unknown

Abstract

A Coprinopsis cinerea homokaryotic fruiting strain was mutagenised, identifying a mutant that exhibited a hyphal growth temperature sensitive defect and hyphal knot development defect at an early fruiting stage, even at the hyphal growth permissive temperature. Microscopic observation suggested that the mutant nuclei exhibited defects in the metaphase to anaphase transition at the restrictive temperature. The gene in which the mutation occurred was cloned, sequenced and determined to be homologous to smc1. Sequence analyses of the mutant revealed deletion of 28 base pairs in the 19th intron of the Cc.smc1 gene, resulting in complete failure of splicing of that intron and in insertion of 14 amino acids in the C-terminal region of the Cc.Smc1 protein. We isolated eight hyphal growth revertants and identified four intragenic suppressors. All were the result of amino acid substitutions in the C-terminal region. Three of the suppressors caused reversion of the arrest in an early fruiting stage. One of the suppressors exhibited cold sensitivity and failed to suppress the fruiting defect, suggesting that flexibility of a lobe in the C-terminal region is important for proper function of Cc.Smc1.

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