A FYVE zinc finger domain protein specifically links mRNA transport to endosome trafficking

Elife. 2015 May 18;4:e06041. doi: 10.7554/eLife.06041.

Abstract

An emerging theme in cellular logistics is the close connection between mRNA and membrane trafficking. A prominent example is the microtubule-dependent transport of mRNAs and associated ribosomes on endosomes. This coordinated process is crucial for correct septin filamentation and efficient growth of polarised cells, such as fungal hyphae. Despite detailed knowledge on the key RNA-binding protein and the molecular motors involved, it is unclear how mRNAs are connected to membranes during transport. Here, we identify a novel factor containing a FYVE zinc finger domain for interaction with endosomal lipids and a new PAM2-like domain required for interaction with the MLLE domain of the key RNA-binding protein. Consistently, loss of this FYVE domain protein leads to specific defects in mRNA, ribosome, and septin transport without affecting general functions of endosomes or their movement. Hence, this is the first endosomal component specific for mRNP trafficking uncovering a new mechanism to couple mRNPs to endosomes.

Keywords: FYVE; PAM2; RRM; Ustilago maydis; cell biology; endosome; infectious disease; mRNA transport; microbiology.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Biological Transport / physiology
  • Blotting, Western
  • Cell Membrane / physiology
  • Chitin / metabolism
  • Endosomes / physiology*
  • Escherichia coli
  • Fluorescence Recovery After Photobleaching
  • Fluorometry
  • Hyphae / growth & development*
  • Image Processing, Computer-Assisted
  • Mutagenesis
  • Protein Structure, Tertiary
  • RNA, Messenger / physiology*
  • RNA-Binding Proteins / genetics
  • RNA-Binding Proteins / metabolism
  • Two-Hybrid System Techniques
  • Ustilago / genetics*
  • Ustilago / growth & development*
  • Zinc Fingers / genetics*

Substances

  • RNA, Messenger
  • RNA-Binding Proteins
  • Chitin

Grant support

The funders had no role in study design, data collection and interpretation, or the decision to submit the work for publication.