The type-2 peroxisomal targeting signal.
Biochim Biophys Acta Mol Cell Res
; 1867(2): 118609, 2020 02.
Article
in En
| MEDLINE
| ID: mdl-31751594
ABSTRACT
The type-2 peroxisomal targeting signal (PTS2) is one of two peptide motifs destining soluble proteins for peroxisomes. This signal acts as amphiphilic α-helix exposing the side chains of all conserved residues to the same side. PTS2 motifs are recognized by a bipartite protein complex consisting of the receptor PEX7 and a co-receptor. Cargo-loaded receptor complexes are translocated across the peroxisomal membrane by a transient pore and inside peroxisomes, cargo proteins are released and processed in many, but not all species. The components of the bipartite receptor are re-exported into the cytosol by a ubiquitin-mediated and ATP-driven export mechanism. Structurally, PTS2 motifs resemble other N-terminal targeting signals, whereas the functional relation to the second peroxisomal targeting signal (PTS1) is unclear. Although only a few PTS2-carrying proteins are known in humans, subjects lacking a functional import mechanism for these proteins suffer from the severe inherited disease rhizomelic chondrodysplasia punctata.
Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Peroxisomal Targeting Signal 2 Receptor
Limits:
Humans
Language:
En
Journal:
Biochim Biophys Acta Mol Cell Res
Year:
2020
Document type:
Article