Targeting pathways of C-tail-anchored proteins.

Biochimica Et Biophysica Acta
Nica Borgese, Elisa Fasana

Abstract

A large group of diverse, functionally important, and differently localized transmembrane proteins, share a particular membrane topology, consisting of a cytosolic N-terminal region, followed by a transmembrane domain close to the C-terminus. The C-terminal membrane anchor of these tail-anchored (TA) proteins generally represents the sole targeting determinant, and becomes available to targeting factors only after release of the finished polypeptide from the ribosome. Hence, TA proteins do not have a chance to interact co-translationally with Signal Recognition Particle and are delivered post-translationally to all target membranes, including the ER. Recent work has demonstrated the existence of different biogenetic pathways for TA proteins. Notably, some are able to efficiently translocate their C-terminus across protein-free bilayers without the participation of any membrane or cytosolic protein, while others require assistance from cytosolic chaperones and membrane receptors. In this review, we summarize current knowledge on the different insertion pathways, with emphasis on a recently discovered chaperone system that operates in fungi as well as in higher eukaryotes to deliver TA proteins to the ER (called Guided Entry of T...Continue Reading

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