The mitochondrial transporter family SLC25: identification, properties and physiopathology

Mol Aspects Med. Apr-Jun 2013;34(2-3):465-84. doi: 10.1016/j.mam.2012.05.005. Epub 2012 Dec 23.

Abstract

SLC25 is a large family of nuclear-encoded transporters embedded in the inner mitochondrial membrane and in a few cases other organelle membranes. The members of this superfamily are widespread in eukaryotes and involved in numerous metabolic pathways and cell functions. They can be easily recognized by their striking sequence features, i.e., a tripartite structure, six transmembrane α-helices and a 3-fold repeated signature motifs. SLC25 members vary greatly in the nature and size of their transported substrates, modes of transport (i.e., uniport, symport or antiport) and driving forces, although the molecular mechanism of substrate translocation may be basically the same. Based on substrate specificity, 24 subfamilies, well conserved throughout evolution, have been functionally characterized mainly by transport assays upon heterologous gene expression, purification and reconstitution into liposomes. Several other SLC25 family members remain to be characterized. In recent years mutations in the SLC25 genes have been shown to be responsible for 11 diseases, highlighting the important role of SLC25 in metabolism.

Publication types

  • Research Support, Non-U.S. Gov't
  • Review

MeSH terms

  • Anion Transport Proteins / metabolism
  • Humans
  • Membrane Transport Proteins / genetics*
  • Membrane Transport Proteins / metabolism
  • Membrane Transport Proteins / physiology*
  • Metabolic Networks and Pathways / genetics*
  • Mitochondrial Membranes / metabolism*
  • Mitochondrial Proteins / metabolism
  • Models, Biological
  • Models, Molecular*
  • Multigene Family / genetics*
  • Phylogeny
  • Protein Conformation*
  • Species Specificity

Substances

  • Anion Transport Proteins
  • Membrane Transport Proteins
  • Mitochondrial Proteins
  • Slc25a1 protein, human