Targeting of Rough Endoplasmic Reticulum Membrane Proteins and Ribosomes in Invertebrate Neurons

Overview

Journal Mol Biol Cell

Specialties Cell Biology
Molecular Biology

Date 2002 May 15

PMID 12006669

Citations 98

Authors

Melissa M Rolls

David H Hall

Martin Victor

Ernst H K Stelzer

Tom A Rapoport

Affiliations

Soon will be listed here.

Abstract

The endoplasmic reticulum (ER) is divided into rough and smooth domains (RER and SER). The two domains share most proteins, but RER is enriched in some membrane proteins by an unknown mechanism. We studied RER protein targeting by expressing fluorescent protein fusions to ER membrane proteins in Caenorhabditis elegans. In several cell types RER and general ER proteins colocalized, but in neurons RER proteins were concentrated in the cell body, whereas general ER proteins were also found in neurites. Surprisingly RER membrane proteins diffused rapidly within the cell body, indicating they are not localized by immobilization. Ribosomes were also concentrated in the cell body, suggesting they may be in part responsible for targeting RER membrane proteins.

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