Where does the peroxisomal targeting signal PTS receptor bind to peroxisome destined proteins?
Where does the peroxisomal targeting signal PTS receptor bind to peroxisome destined proteins?
The PEX5 import receptor carries proteins with a PTS1 signal to the peroxisomal lumen by a highly unusual mechanism. The soluble protein PEX5 is proposed to bind the PTS1 motif and insert into the lipid bilayer surrounding the peroxisome, where it forms a transient pore to deliver the cargo protein into the lumen.
How are proteins targeted to peroxisomes?
The import of peroxisomal matrix proteins differs significantly from other organelles like mitochondria or chloroplasts as peroxisomes can accommodate folded and oligomeric proteins that are targeted to the membrane via cycling receptors.
What does PTS2 mean?
PTS2
| Acronym | Definition |
|---|---|
| PTS2 | Peroxisome Targeting Signal Type-2 |
| PTS2 | Peroxisomal Targeting Sequence Type-2 |
How do proteins get into peroxisomes?
Peroxisomes are unique among single-membrane organelles in that peroxisomes are capable of importing both their matrix and membrane proteins directly from the cytosol. Peroxisomal matrix proteins are nuclear encoded and are synthesized on free polyribosomes [3].
What is a peroxisomal targeting signal (PTS)?
Receptors recognize and bind to a region of the peroxisomal protein called a peroxisomal targeting signal, or PTS. Peroxisomes consist of a matrix surrounded by a specific membrane. Most peroxisomal matrix proteins contain a short sequence, usually three amino acids at the extreme carboxy tail of the protein, that serves as the PTS.
What is the first step in the peroxisomal pathway?
Overview. The first step in this process is the binding of the protein to a receptor. The receptor then directs the complex to the peroxisome. Receptors recognize and bind to a region of the peroxisomal protein called a peroxisomal targeting signal, or PTS.
What are peroxisomal matrix proteins?
Peroxisomes consist of a matrix surrounded by a specific membrane. Most peroxisomal matrix proteins contain a short sequence, usually three amino acids at the extreme carboxy tail of the protein, that serves as the PTS.
What is the PEX7 receptor?
A few peroxisomal matrix proteins have a different, and less conserved sequence, at their amino termini. This PTS2 signal is recognized by the PTS2 receptor, encoded by the PEX7 gene. “PEX” refers to a group of genes that were identified as being important for peroxisomal synthesis.
