Abstract
Tail-anchored (TA) proteins are special class of integral membrane proteins that in recent years have received a considerable amount of attention due to their diverse cellular functions and unique targeting and insertion mechanisms. Defined by the presence of a single, hydrophobic membrane-spanning domain at or near their C terminus, TA proteins must be inserted into membranes post-translationally and are orientated such that their larger N-terminal domain (most often the functional domain) faces the cytosol, while their shorter C-terminal domain faces the interior of the organelle. The C-terminal domain of TA proteins also usually contains the information responsible for their selective targeting to the proper subcellular membrane, a process that, based primarily on studies with yeasts and mammals, appears to be highly complex due to the presence of multiple pathways. Within this context, we discuss here the biogenesis of plant TA proteins and the potential for hundreds of new TA proteins identified via bioinformatics screens to contribute to the already remarkable number of roles that this class of membrane proteins participates in throughout plant growth and development.
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Abbreviations
- AKR2A:
-
Ankryin repeat-containing protein 2A
- APX:
-
Ascorbate peroxidase
- Cb5:
-
Cytochrome b 5
- DRP:
-
Dynamin-related protein
- ER:
-
Endoplasmic reticulum
- Fis1:
-
FISSION 1
- Get:
-
Guided entry of tail-anchored proteins
- MDAR:
-
Monodehydroascorbate reductase
- OEP:
-
Outer envelope protein
- Pex:
-
Peroxin
- PMD1:
-
Peroxisomal and mitochondrial division factor 1
- PMP:
-
Peroxisomal membrane protein
- SAM:
-
Sorting and assembly machinery
- SNARE:
-
Soluble NSF attachment protein receptors
- SRP:
-
Signal recognition particle
- TA:
-
Tail-anchored
- TOC:
-
Chloroplast outer envelope translocase
- TOM:
-
Mitochondrial outer membrane translocase
- TMD:
-
Transmembrane domain
- TPR:
-
Tetratricopeptide repeat
- WIP:
-
(Trp-Pro-Pro)-domain-interacting protein
- WIT:
-
(Trp-Pro-Pro)-domain interacting tail-anchored protein
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Acknowledgments
We thank Ian Smith for assistance with figure constructions and Verena Kriechbaumer for assistance with manuscript preparation. We apologize to colleagues whose work we have been unable to cite because of space constraints. This work was supported by a Biotechnology and Biological Sciences Research Council Research Grant awarded to BMA and a University of Guelph Research Chair and grant from the Natural Sciences and Engineering Research Council of Canada to RTM.
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Abell, B.M., Mullen, R.T. Tail-anchored membrane proteins: exploring the complex diversity of tail-anchored-protein targeting in plant cells. Plant Cell Rep 30, 137–151 (2011). https://doi.org/10.1007/s00299-010-0925-6
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DOI: https://doi.org/10.1007/s00299-010-0925-6