1AKS image
Entry Detail
PDB ID:
1AKS
Keywords:
SERINE PROTEASE
Title:
CRYSTAL STRUCTURE OF THE FIRST ACTIVE AUTOLYSATE FORM OF THE PORCINE ALPHA TRYPSIN
Biological Source:
Source Organism:
Sus scrofa
PDB Version:
Deposition Date:
1996-07-24
Release Date:
1997-02-12
Method Details:
Experimental Method:
X-RAY DIFFRACTION
Resolution:
1.80 Å
R-Value Work:
0.2
R-Value Observed:
0.2
Space Group:
P 21 21 21
1AKS validation report
Macromolecular Entities
Protein Blast
Polymer Type:polypeptide(L)
Description:ALPHA TRYPSIN
Chain IDs:A
Chain Length:125
Number of Molecules:1
Biological Source:Sus scrofa
UniProt ID:P00761 Pfam ID:PF00089 EC:3.4.21.4
Protein Blast
Polymer Type:polypeptide(L)
Description:ALPHA TRYPSIN
Chain IDs:B
Chain Length:98
Number of Molecules:1
Biological Source:Sus scrofa
UniProt ID:P00761 Pfam ID:PF00089 EC:3.4.21.4
Ligand Molecules
CA
Primary Citation
The first structure at 1.8 A resolution of an active autolysate form of porcine alpha-trysoin.
Acta Crystallogr.,Sect.D 53 311 315 (1997)
PMID: 15299934 DOI: 10.1107/S0907444997000358

Abstact

The first crystal structure of an active autolysate form of porcine alpha-trypsin (APT), a two-chain molecule obtained from the limited autolysis of porcine beta-trypsin at position Lys145-Ser146, has been determined. APT crystallizes in space group P2(1)2(1)2(1) with one protein molecule in the asymmetric unit. The structure was solved by molecular replacement followed by refinement using X-PLOR to an R factor of 0.200 and an R(free) of 0.285 for 8.0-1.8 A data with r.m.s deviations from ideal values of 0.01 A and 1.7 degrees for bond lengths and bond angles, respectively. Comparison with inactive autolysate porcine epsilon-trypsin (EPT) and porcine beta-trypsin in complex with bittergourd trypsin inhibitor (MCT) revealed a small but systematic directional chain shift around the active-site residues from APT to EPT to MCT.

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Primary Citation of related structures
1AKS