01778nas a2200205   4500008004100000245007500041210006900116300001300185490000800198520097700206653011101183653003901294653004101333100002001374700001401394700002401408700001701432700001701449856010601466       2007                        eng d00aProtein translocation into peroxisomes by ring-shaped import receptors0 aProtein translocation into peroxisomes by ringshaped import rece  a4795-8020 v5813 aFolded and functional proteins destined for translocation from the cytosol into the peroxisomal matrix are recognized by two different peroxisomal import receptors, Pex5p and Pex7p. Both cargo-loaded receptors dock on the same translocon components, followed by cargo release and receptor recycling, as part of the complete translocation process. Recent structural and functional evidence on the Pex5p receptor has provided insight on the molecular requirements of specific cargo recognition, while the remaining processes still remain largely elusive. Comparison of experimental structures of Pex5p and a structural model of Pex7p reveal that both receptors are built by ring-like arrangements with cargo binding sites, central to the respective structures. Although, molecular insight into the complete peroxisomal translocon still remains to be determined, emerging data allow to deduce common molecular principles that may hold for other translocation systems as well.10aAmino Acid Sequence Binding Sites Humans Molecular Sequence Data Peroxisomes/*metabolism Protein Structure10aCytoplasmic and Nuclear/*chemistry10aTertiary Protein Transport Receptors1 aStanley, W., A.1 aFodor, K.1 aMarti-Renom, M., A.1 aSchliebs, W.1 aWilmanns, M.  uhttp://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&dopt=Citation&list_uids=17884042