7ZSC image
Entry Detail
PDB ID:
7ZSC
Keywords:
Title:
Crystal structure of the heterodimeric human C-P4H-II with truncated alpha subunit (C-P4H-II delta281)
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2022-05-06
Release Date:
2022-11-09
Method Details:
Experimental Method:
Resolution:
3.85 Å
R-Value Free:
0.27
R-Value Work:
0.24
R-Value Observed:
0.24
Space Group:
H 3
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Prolyl 4-hydroxylase subunit alpha-2
Chain IDs:A, B
Chain Length:262
Number of Molecules:2
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:Protein disulfide-isomerase
Chain IDs:C, D
Chain Length:492
Number of Molecules:2
Biological Source:Homo sapiens
Ligand Molecules
Primary Citation
Crystal structure of the collagen prolyl 4-hydroxylase (C-P4H) catalytic domain complexed with PDI: Toward a model of the C-P4H alpha 2 beta 2 tetramer.
J.Biol.Chem. 298 102614 102614 (2022)
PMID: 36265586 DOI: 10.1016/j.jbc.2022.102614

Abstact

Collagen prolyl 4-hydroxylases (C-P4H) are α2β2 tetramers, which catalyze the prolyl 4-hydroxylation of procollagen, allowing for the formation of the stable triple-helical collagen structure in the endoplasmic reticulum. The C-P4H α-subunit provides the N-terminal dimerization domain, the middle peptide-substrate-binding (PSB) domain, and the C-terminal catalytic (CAT) domain, whereas the β-subunit is identical to the enzyme protein disulfide isomerase (PDI). The structure of the N-terminal part of the α-subunit (N-terminal region and PSB domain) is known, but the structures of the PSB-CAT linker region and the CAT domain as well as its mode of assembly with the β/PDI subunit, are unknown. Here, we report the crystal structure of the CAT domain of human C-P4H-II complexed with the intact β/PDI subunit, at 3.8 Å resolution. The CAT domain interacts with the a, b', and a' domains of the β/PDI subunit, such that the CAT active site is facing bulk solvent. The structure also shows that the C-P4H-II CAT domain has a unique N-terminal extension, consisting of α-helices and a β-strand, which is the edge strand of its major antiparallel β-sheet. This extra region of the CAT domain interacts tightly with the β/PDI subunit, showing that the CAT-PDI interface includes an intersubunit disulfide bridge with the a' domain and tight hydrophobic interactions with the b' domain. Using this new information, the structure of the mature C-P4H-II α2β2 tetramer is predicted. The model suggests that the CAT active-site properties are modulated by α-helices of the N-terminal dimerization domains of both subunits of the α2-dimer.

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