A Protein Required for RNA Processing and Splicing in Neurospora Mitochondria is Related to Gene Products Involved in Cell Cycle Protein Phosphatase Functions

Overview

Journal Proc Natl Acad Sci U S A

Specialty Science

Date 1992 Mar 1

PMID 1311848

Citations 10

Authors

B Turcq

K F Dobinson

N Serizawa

A M Lambowitz

Affiliations

Soon will be listed here.

Abstract

The Neurospora crassa cyt-4 mutants have pleiotropic defects in mitochondrial RNA splicing, 5' and 3' end processing, and RNA turnover. Here, we show that the cyt-4+ gene encodes a 120-kDa protein with significant similarity to the SSD1/SRK1 protein of Saccharomyces cerevisiae and the DIS3 protein of Schizosaccharomyces pombe, which have been implicated in protein phosphatase functions that regulate cell cycle and mitotic chromosome segregation. The CYT-4 protein is present in mitochondria and is truncated or deficient in two cyt-4 mutants. Assuming that the CYT-4 protein functions in a manner similar to the SSD1/SRK1 and DIS3 proteins, we infer that the mitochondrial RNA splicing and processing reactions defective in the cyt-4 mutants are regulated by protein phosphorylation and that the defects in the cyt-4 mutants result from failure to normally regulate this process. Our results provide evidence that RNA splicing and processing reactions may be regulated by protein phosphorylation.

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