Literature DB >> 8516295

Interactions between three common subunits of yeast RNA polymerases I and III.

D Lalo1, C Carles, A Sentenac, P Thuriaux.   

Abstract

The AC40 and AC19 subunits (encoded by RPC40 and RPC19) are shared by yeast RNA polymerases I and III and have a local sequence similarity to prokaryotic alpha subunits. Mutational analysis of the corresponding "alpha motif" indicated that its integrity is essential on AC40 subunit but is not essential on AC19 subunit. By applying the two-hybrid method, these two polypeptides were shown to associate in vivo. Extragenic suppression of rpc19 and rpc40 mutations confirmed that AC19 and AC40 subunits interact with each other in vivo and revealed an interaction with ABC10 beta subunit [encoded by RPB10; Woychick, N. A. & Young, R.A. (1990) J. Biol. Chem. 265, 17816-17819], one of the five polypeptides common to all three nuclear RNA polymerases. A correction of the RPB10 sequence showed that ABC10 beta subunit is a 70-amino acid polypeptide, as confirmed by peptide microsequencing. These results suggest that the assembly of RNA polymerase I and III requires the association of ABC10 beta subunit with an AC19/AC40 heterodimer.

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Year:  1993        PMID： 8516295      PMCID： PMC46753          DOI： 10.1073/pnas.90.12.5524

Source DB:  PubMed          Journal:  Proc Natl Acad Sci U S A        ISSN： 0027-8424            Impact factor:   11.205


  48 in total

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  37 in total

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7.  Determinants of RNA polymerase alpha subunit for interaction with beta, beta', and sigma subunits: hydroxyl-radical protein footprinting.

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8.  Localization of yeast RNA polymerase I core subunits by immunoelectron microscopy.

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Journal:  EMBO J       Date:  1996-09-02       Impact factor: 11.598

9.  Nucleolar localization of early tRNA processing.

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10.  Suppression of yeast RNA polymerase III mutations by FHL1, a gene coding for a fork head protein involved in rRNA processing.

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