4HXE image
Entry Detail
PDB ID:
4HXE
Keywords:
Title:
Pyrococcus horikoshii acylaminoacyl peptidase (uncomplexed)
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2012-11-09
Release Date:
2013-05-08
Method Details:
Experimental Method:
Resolution:
1.91 Å
R-Value Free:
0.21
R-Value Work:
0.17
R-Value Observed:
0.17
Space Group:
H 3 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Putative uncharacterized protein PH0594
Chain IDs:A (auth: B)
Chain Length:622
Number of Molecules:1
Biological Source:Pyrococcus horikoshii
Primary Citation
A Self-compartmentalizing Hexamer Serine Protease from Pyrococcus Horikoshii: SUBSTRATE SELECTION ACHIEVED THROUGH MULTIMERIZATION.
J.Biol.Chem. 288 17884 17894 (2013)
PMID: 23632025 DOI: 10.1074/jbc.M113.451534

Abstact

Oligopeptidases impose a size limitation on their substrates, the mechanism of which has long been under debate. Here we present the structure of a hexameric serine protease, an oligopeptidase from Pyrococcus horikoshii (PhAAP), revealing a complex, self-compartmentalized inner space, where substrates may access the monomer active sites passing through a double-gated "check-in" system, first passing through a pore on the hexamer surface and then turning to enter through an even smaller opening at the monomers' domain interface. This substrate screening strategy is unique within the family. We found that among oligopeptidases, a residue of the catalytic apparatus is positioned near an amylogenic β-edge, which needs to be protected to prevent aggregation, and we found that different oligopeptidases use different strategies to achieve such an end. We propose that self-assembly within the family results in characteristically different substrate selection mechanisms coupled to different multimerization states.

Legend

Protein

Chemical

Disease

Primary Citation of related structures