Abstract
The recently increasing number of atomic structures for active transporters has not only revealed strong conservation in the architecture of sequence-unrelated transporter families, but also identified a unifying element called the ‘inverted repeat topology,’ which is found in nearly all transporter folds to date. Indeed, most membrane transporters consist of two or more domains with similar structure, so-called repeats. It is tempting to speculate that transporters have evolved by duplication of one repeat followed by gene fusion and modification events. An intriguing question is, whether recent genes encoding such a ‘half-transporter’ still exist as independent folding units. Although it seems likely that the evolution of membrane transport proteins, which harbor internal repeats, is linked to these minimal structural building blocks, their identification in the absence of structural data represents a major challenge, as sequence homology is not an issue. In this review we discuss two protein families, the DedA family and the SWEET family, being potential half-transporters and putative ancestors for two of the most abundant secondary transporter families, the MFS family and the LeuT-fold family.
References
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©2014 by De Gruyter
Articles in the same Issue
- Frontmatter
- Guest Editorial
- Highlight: Membrane transport on the move
- HIGHLIGHT: 9TH TRANSPORT COLLOQUIUM
- Small membrane proteins – elucidating the function of the needle in the haystack
- When two turn into one: evolution of membrane transporters from half modules
- Central role of the Na+-translocating NADH:quinone oxidoreductase (Na+-NQR) in sodium bioenergetics of Vibrio cholerae
- Principles and mechanisms of CD95 activation
- Stitching proteins into membranes, not sew simple
- Cell-free expression of G-protein coupled receptors: new pipelines for challenging targets
- Voltage-dependent anion channels: the wizard of the mitochondrial outer membrane
- Structural characterization of a C-terminally truncated E5 oncoprotein from papillomavirus in lipid bilayers
- Minireview
- Genetic variation within transcriptional regulatory elements and its implications for human disease
- Research Articles/Short Communications
- Molecular Medicine
- Methotrexate-gelonin conjugate – an inhibitor of MCF-7 cells expressing the dihydrofolate receptor
Articles in the same Issue
- Frontmatter
- Guest Editorial
- Highlight: Membrane transport on the move
- HIGHLIGHT: 9TH TRANSPORT COLLOQUIUM
- Small membrane proteins – elucidating the function of the needle in the haystack
- When two turn into one: evolution of membrane transporters from half modules
- Central role of the Na+-translocating NADH:quinone oxidoreductase (Na+-NQR) in sodium bioenergetics of Vibrio cholerae
- Principles and mechanisms of CD95 activation
- Stitching proteins into membranes, not sew simple
- Cell-free expression of G-protein coupled receptors: new pipelines for challenging targets
- Voltage-dependent anion channels: the wizard of the mitochondrial outer membrane
- Structural characterization of a C-terminally truncated E5 oncoprotein from papillomavirus in lipid bilayers
- Minireview
- Genetic variation within transcriptional regulatory elements and its implications for human disease
- Research Articles/Short Communications
- Molecular Medicine
- Methotrexate-gelonin conjugate – an inhibitor of MCF-7 cells expressing the dihydrofolate receptor