Published 23 June 2003. doi:10.1083/jcb.200303069
© The Rockefeller University Press,
0021-9525/2003/6/1013 $5.00
The Journal of Cell Biology, Volume 161, Number 6, 1013-1019
The tale of tail-anchored proteins
:
coming from the cytosol and looking for a membrane
Nica Borgese1,2,
Sara Colombo1 and
Emanuela Pedrazzini3
1 Consiglio Nazionale delle Ricerche Institute for Neuroscience, Cellular and Molecular Pharmacology Section, and Department of Medical Pharmacology, University of Milan, 20129 Milano, Italy
2 Faculty of Pharmacy, University of Catanzaro Magna Graecia, 88021 Roccelletta di Borgia (CZ), Italy
3 Consiglio Nazionale delle Ricerche Istituto di Biologia e Biotecnologia Agraria, 20133 Milano, Italy
Address correspondence to Nica Borgese, CNR Institute for Neuroscience, Cellular and Molecular Pharmacology Section, via Vanvitelli 32, 20129 Milano, Italy. Tel.: 3902-50316971. Fax: 3902-7490574. E-mail: n.borgese{at}in.cnr.it
A group of integral membrane proteins, known as C-tail anchored, is defined by the presence of a cytosolic NH2-terminal domain that is anchored to the phospholipid bilayer by a single segment of hydrophobic amino acids close to the COOH terminus. The mode of insertion into membranes of these proteins, many of which play key roles in fundamental intracellular processes, is obligatorily posttranslational, is highly specific, and may be subject to regulatory processes that modulate the protein's function. Although recent work has elucidated structural features in the tail region that determine selection of the correct target membrane, the molecular machinery involved in interpreting this information, and in modulating tail-anchored protein localization, has not been identified yet.
Key Words: endoplasmic reticulum; membrane traffic; mitochondrial outer membrane; protein targeting and translocation; transmembrane domain
* Abbreviations used in this paper: MOM, mitochondrial outer membrane; SNARE, soluble N-ethylmaledimidesensitive factor attachment protein receptor; SRP, signal recognition particle; TA, tail-anchored; TMD, transmembrane domain; TOM, translocase of the outer mitochondrial membrane; UBC6, ubiquitin conjugating enzyme 6.

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