6A8O image
Entry Detail
PDB ID:
6A8O
Keywords:
HYDROLASE
Title:
Crystal structures of the serine protease domain of murine plasma kallikrein with peptide inhibitor mupain-1-16
Biological Source:
Source Organism:
Mus musculus, Synthemiopsis
Host Organism:
Pichia
PDB Version:
Deposition Date:
2018-07-09
Release Date:
2019-07-10
Method Details:
Experimental Method:
X-RAY DIFFRACTION
Resolution:
2.77 Å
R-Value Free:
0.30
R-Value Work:
0.21
R-Value Observed:
0.21
Space Group:
P 21 21 21
6A8O validation report
Macromolecular Entities
Protein Blast
Polymer Type:polypeptide(L)
Description:Plasma kallikrein
Chain IDs:A, B
Chain Length:248
Number of Molecules:2
Biological Source:Mus musculus
UniProt ID:P26262 Pfam ID:PF00089 EC:3.4.21.34
Polymer Type:polypeptide(L)
Description:peptide inhibitor,
Chain IDs:C (auth: P)
Chain Length:10
Number of Molecules:1
Biological Source:Synthemiopsis
Ligand Molecules
MAN
MRZ
Primary Citation
Crystal structure of plasma kallikrein reveals the unusual flexibility of the S1 pocket triggered by Glu217.
Febs Lett. 592 2658 2667 (2018)
PMID: 30019481 DOI: 10.1002/1873-3468.13191

Abstact

UNLABELLED Serine proteases play important roles in numerous physiological and pathophysiological processes. Moreover, serine proteases are classical subjects for studies of catalytic and inhibitory mechanisms of enzymes. Here, we determined the crystal structures of a serine protease, murine plasma kallikrein (mPK), and its complex with a peptidic inhibitor. Although mPK in the complex adopts a canonical protease structure, the apo-mPK exhibits a previously unobserved structural feature: the entrance of the intact S1 pocket is blocked by Glu217. In addition, molecular dynamics simulations and functional assays support the flexibility of Glu217 and suggest that this flexibility plays a role in regulating the activity of serine proteases. ENZYMES EC: 3.4.21.34.

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Primary Citation of related structures
6A8O