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Characterization of a unique protein component of yeast RNase MRP: an RNA-binding protein with a zinc-cluster domain.

Abstract：

:RNase MRP is a ribonucleoprotein endoribonuclease that has been shown to cleave mitochondrial primer RNA sequences from a variety of sources. Most of the RNase MRP activity is found in the nucleus where it plays a role in the processing of 5.8S rRNA. A temperature-conditional point mutation in the yeast RNA component of the enzyme has been identified. This mutation results in a loss of normal rRNA processing at the nonpermissive temperature while cellular levels of the RNA component of RNase MRP remain stable. High-copy suppressor analysis of this point mutation was employed to identify interacting proteins. A unique suppressor, termed SNM1 (suppressor of nuclear mitochondrial endoribonuclease 1), was identified repeatedly. The SNM1 gene was localized to the right arm of chromosome IV, directly adjacent to the SNF1 gene, and it contains an open reading frame encoding a protein of 198 amino acids. The protein contains a leucine zipper motif, a zinc-cluster motif, and a serine/lysine-rich tail. The gene was found to be essential for viability in a yeast cell, consistent with it being a protein component of the RNase MRP ribonucleoprotein complex. Recombinant SNM1 protein binds RNA in both gel retardation and Northwestern assays. Antibodies raised against bacterially expressed proteins identified four separate species in yeast whole cell extracts. Antibodies directed against the SNM1 protein immunoprecipitated RNase MRP RNA from whole-cell extracts without precipitating the structurally and functionally related RNase P RNA. We propose that the SNM1 protein is an essential and specific component of the RNase MRP ribonucleoprotein complex, the first unique protein of this complex to be identified.

journal_name

Genes Dev

journal_title

Genes & development

authors

Schmitt ME,Clayton DA

doi

10.1101/gad.8.21.2617

subject

Has Abstract

pub_date

1994-11-01 00:00:00

pages

2617-28

issue

21

eissn

0890-9369

issn

1549-5477

journal_volume

8

pub_type

杂志文章

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