Biochem Biophys Res Commun. 2007 Dec 21;364(3):573-7. Epub 2007 Oct 15.

Inhibition of splicing and nuclear retention of pre-mRNA by spliceostatin A in fission yeast.

Lo CW, Kaida D, Nishimura S, Matsuyama A, Yashiroda Y, Taoka H, Ishigami K, Watanabe H, Nakajima H, Tani T, Horinouchi S, Yoshida M.

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Chemical Genetics Laboratory, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan.

Abstract

Nuclear retention of pre-mRNAs is tightly regulated by several security mechanisms that prevent pre-mRNA export into the cytoplasm. Recently, spliceostatin A, a methylated derivative of a potent antitumor microbial metabolite FR901464, was found to cause pre-mRNA accumulation and translation in mammalian cells. Here we report that spliceostatin A also inhibits splicing and nuclear retention of pre-mRNA in a fission yeast strain that lacks the multidrug resistance protein Pmd1. As observed in mammalian cells, spliceostatin A is bound to components of the SF3b complex in the spliceosome. Furthermore, overexpression of nup211, a homolog of Saccharomyces cerevisiae MLP1, suppresses translation of pre-mRNAs accumulated by spliceostatin A. These results suggest that the SF3b complex has a conserved role in pre-mRNA retention, which is independent of the Mlp1 function.

PMID:: 17961508; [PubMed - indexed for MEDLINE]

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