Insights into a CRM1-mediated RNA-nuclear export pathway in Trypanosoma cruzi

Ileana C. Cuevas, Alberto C C Frasch, Iván D'Orso

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Nuclear export and import of proteins and RNAs is a regulated process that permits the control of protein expression during cell development and differentiation. In all eukaryotic organisms transport of proteins to specific cellular compartments requires specific signaling sequences. Proteins that shuttle between nucleus and cytoplasm bear nuclear localization signals (NLS) and/or nuclear export signals (NES) and some of them can carry mRNAs, as part of shuttling ribonucleoprotein complexes. In this work we describe in the protozoan parasite Trypanosoma cruzi, a CRM1/exportin1 nuclear export factor named TcCRM1. This protein contains the conserved central region (CCR) that interacts with NES sequences present within cargo molecules, and the Cys residue involved in covalent binding to the Streptomyces metabolite leptomycin B (LMB). By subcellular fractionation we show that TcCRM1, a protein of about 117 kDa, has nuclear localization. We also demonstrate that LMB inhibits the replication of T. cruzi in a dose-dependent manner. In situ hybridization experiments performed with a Texas red-coupled oligo(dT) probe revealed that LMB produced a partial short-term accumulation of a poly(A) + RNA subset in the nucleus. Some mRNAs such as HSP70, TcUBP2/1 and TcPABP1 are reduced or disappeared from the cytoplasm of LMB treated cells. In sharp contrast with metazoans, no effect was observed on two U snRNAs subcellular localization, implying that a different export route might exist for these RNAs in trypanosomes.

Original languageEnglish (US)
Pages (from-to)15-24
Number of pages10
JournalMolecular and Biochemical Parasitology
Volume139
Issue number1
DOIs
StatePublished - Jan 2005

Fingerprint

Cell Nucleus Active Transport
Trypanosoma cruzi
RNA
Nuclear Export Signals
Proteins
Messenger RNA
Cytoplasm
Nuclear Localization Signals
Ribonucleoproteins
Trypanosomiasis
Streptomyces
Protein Sorting Signals
In Situ Hybridization
Cell Differentiation
Carrier Proteins
Parasites
leptomycin B

Keywords

  • CRM1
  • Leptomycin B
  • RNA-nuclear export
  • Trypanosoma
  • U snRNA

ASJC Scopus subject areas

  • Molecular Biology
  • Parasitology

Cite this

Insights into a CRM1-mediated RNA-nuclear export pathway in Trypanosoma cruzi. / Cuevas, Ileana C.; Frasch, Alberto C C; D'Orso, Iván.

In: Molecular and Biochemical Parasitology, Vol. 139, No. 1, 01.2005, p. 15-24.

Research output: Contribution to journalArticle

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