A new yeast poly(A) polymerase complex involved in RNA quality control

VAŇÁČOVÁ, Štěpánka; Jeannette WOLF; Georges MARTIN; Diana BLANK; Sabine DETTWILER; Arno FRIEDLEIN; Hanno LANGEN; Gerard KEITH a Walter KELLER. A new yeast poly(A) polymerase complex involved in RNA quality control. PLoS Biology. 2005, roč. 3, č. 6, s. e189, 12 s. ISSN 1544-9173.

Základní údaje

Originální název

A new yeast poly(A) polymerase complex involved in RNA quality control

Název česky

A new yeast poly(A) polymerase complex involved in RNA quality control

Autoři

VAŇÁČOVÁ, Štěpánka; Jeannette WOLF; Georges MARTIN; Diana BLANK; Sabine DETTWILER; Arno FRIEDLEIN; Hanno LANGEN; Gerard KEITH a Walter KELLER

Vydání

PLoS Biology, 2005, 1544-9173

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Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10600 1.6 Biological sciences

Stát vydavatele

Spojené státy

Utajení

není předmětem státního či obchodního tajemství

Impakt faktor

Impact factor: 14.672

Označené pro přenos do RIV

Ano

Kód RIV

RIV/00216224:14310/05:00036233

Organizační jednotka

Přírodovědecká fakulta

UT WoS

000229992900009

Klíčová slova česky

polyadenylation; Trf4; Trf5; TRAMP; exosome; RNA degradation; RNA surveillance

Klíčová slova anglicky

polyadenylation; Trf4; Trf5; TRAMP; exosome; RNA degradation; RNA surveillance

Štítky

exosome, polyadenylation, RNA degradation, RNA surveillance, TRAMP, Trf4, Trf5

Příznaky

Mezinárodní význam, Recenzováno

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Anotace

V originále

Eukaryotic cells contain several unconventional poly(A) polymerases in addition to the canonical enzymes responsible for the synthesis of poly(A) tails of nuclear messenger RNA precursors. The yeast protein Trf4p has been implicated in a quality control pathway that leads to the polyadenylation and subsequent exosome-mediated degradation of hypomethylated initiator tRNAMet (tRNAiMet). Here we show that Trf4p is the catalytic subunit of a new poly(A) polymerase complex that contains Air1p or Air2p as potential RNA-binding subunits, as well as the putative RNA helicase Mtr4p. Comparison of native tRNAiMet with its in vitro transcribed unmodified counterpart revealed that the unmodified RNA was preferentially polyadenylated by affinity-purified Trf4 complex from yeast, as well as by complexes reconstituted from recombinant components. These results and additional experiments with other tRNA substrates suggested that the Trf4 complex can discriminate between native tRNAs and molecules that are incorrectly folded. Moreover, the polyadenylation activity of the Trf4 complex stimulated the degradation of unmodified tRNAiMet by nuclear exosome fractions in vitro. Degradation was most efficient when coupled to the polyadenylation activity of the Trf4 complex, indicating that the poly(A) tails serve as signals for the recruitment of the exosome. This polyadenylation-mediated RNA surveillance resembles the role of polyadenylation in bacterial RNA turnover.

Česky

Eukaryotic cells contain several unconventional poly(A) polymerases in addition to the canonical enzymes responsible for the synthesis of poly(A) tails of nuclear messenger RNA precursors. The yeast protein Trf4p has been implicated in a quality control pathway that leads to the polyadenylation and subsequent exosome-mediated degradation of hypomethylated initiator tRNAMet (tRNAiMet). Here we show that Trf4p is the catalytic subunit of a new poly(A) polymerase complex that contains Air1p or Air2p as potential RNA-binding subunits, as well as the putative RNA helicase Mtr4p. Comparison of native tRNAiMet with its in vitro transcribed unmodified counterpart revealed that the unmodified RNA was preferentially polyadenylated by affinity-purified Trf4 complex from yeast, as well as by complexes reconstituted from recombinant components. These results and additional experiments with other tRNA substrates suggested that the Trf4 complex can discriminate between native tRNAs and molecules that are incorrectly folded. Moreover, the polyadenylation activity of the Trf4 complex stimulated the degradation of unmodified tRNAiMet by nuclear exosome fractions in vitro. Degradation was most efficient when coupled to the polyadenylation activity of the Trf4 complex, indicating that the poly(A) tails serve as signals for the recruitment of the exosome. This polyadenylation-mediated RNA surveillance resembles the role of polyadenylation in bacterial RNA turnover.