BackgroundIn eukaryotic cells, directional transport between different compartments of the endomembrane system is mediated by vesicles that bud from a donor organelle and then fuse with an acceptor organelle. A family of integral membrane proteins, termed soluble N-ethylmaleimide-sensitive factor attachment receptor (SNARE) proteins, constitute the key machineries of these different membrane fusion events. Over the past 30 years, the yeast Saccharomyces cerevisiae has served as a powerful model organism for studying the organization of the secretory and endocytic pathways, and a few years ago, its entire set of SNAREs was compiled.ResultsHere, we make use of the increasing amount of genomic data to investigate the history of the SNARE family during fungi evolution. Moreover, since different SNARE family members are thought to demarcate different organelles and vesicles, this approach allowed us to compare the organization of the endomembrane systems of yeast and animal cells. Our data corroborate the notion that fungi generally encompass a relatively simple set of SNARE proteins, mostly comprising the SNAREs of the proto-eukaryotic cell. However, all fungi contain a novel soluble SNARE protein, Vam7, which carries an N-terminal PX-domain that acts as a phosphoinositide binding module. In addition, the points in fungal evolution, at which lineage-specific duplications and diversifications occurred, could be determined. For instance, the endosomal syntaxins Pep12 and Vam3 arose from a gene duplication that occurred within the Saccharomycotina clade.ConclusionAlthough the SNARE repertoire of baker's yeast is highly conserved, our analysis reveals that it is more deviated than the ones of basal fungi. This highlights that the trafficking pathways of baker's yeast are not only different to those in animal cells but also are somewhat different to those of many other fungi.
Phylogeny of the SNARE vesicle fusion machinery yields insights into the conservation of the secretory pathway in fungi
N. Kienle,Tobias H. Kloepper,D. Fasshauer
Published 2009 in BMC Evolutionary Biology
ABSTRACT
PUBLICATION RECORD
- Publication year
2009
- Venue
BMC Evolutionary Biology
- Publication date
2009-01-23
- Fields of study
Biology, Medicine
- Identifiers
- External record
- Source metadata
Semantic Scholar, PubMed
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CLAIMS
CONCEPTS
- baker's yeast
Saccharomyces cerevisiae, the yeast model organism whose SNARE repertoire is compared with other fungi.
Aliases: Saccharomyces cerevisiae, yeast
- basal fungi
Early-branching fungal groups used as a comparison set for SNARE repertoire conservation.
Aliases: early-branching fungi
- pep12
An endosomal syntaxin SNARE found in fungi and used in the phylogenetic comparison.
- proto-eukaryotic cell
The inferred ancestral eukaryotic cell state used here as a reference for early SNARE complement composition.
Aliases: ancestral eukaryotic cell
- px domain
A phosphoinositide-binding protein domain found at the N-terminus of Vam7.
Aliases: phox homology domain
- saccharomycotina clade
A fungal lineage within which the duplication giving rise to Pep12 and Vam3 is placed.
Aliases: Saccharomycotina
- snare proteins
A family of membrane fusion proteins that mediate vesicle fusion between compartments of the endomembrane system.
Aliases: soluble N-ethylmaleimide-sensitive factor attachment receptor proteins, SNAREs
- vam3
An endosomal syntaxin SNARE found in fungi and used in the phylogenetic comparison.
- vam7
A fungal soluble SNARE protein that contains an N-terminal PX domain.
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