2F91

1.2A resolution structure of a crayfish trypsin complexed with a peptide inhibitor, SGTI

• PDB DOI: https://doi.org/10.2210/pdb2F91/pdb
• Entry: 2F91 supersedes: 1YR4

• Classification: HYDROLASE/HYDROLASE INHIBITOR
• Organism(s): Astacus leptodactylus, Schistocerca gregaria
• Mutation(s): Yes 


• Deposited: 2005-12-05 Released: 2006-04-18 
• Deposition Author(s): Fodor, K., Harmat, V., Hetenyi, C., Kardos, J., Antal, J., Perczel, A., Patthy, A., Katona, G., Graf, L.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.20 Å
• R-Value Free: 0.182 

Starting Model: experimental

Literature

Enzyme:Substrate Hydrogen Bond Shortening during the Acylation Phase of Serine Protease Catalysis.

Fodor, K., Harmat, V., Neutze, R., Szilagyi, L., Graf, L., Katona, G.

(2006) Biochemistry 45: 2114-2121

• PubMed: 16475800 
• DOI: https://doi.org/10.1021/bi0517133
• Primary Citation of Related Structures:  
  2F91


• PubMed Abstract: 
  

  Atomic resolution (

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Organizational Affiliation: 

Biotechnology Research Group of the Hungarian Academy of Sciences, Pázmány Street 1/C, 1117 Budapest, Hungary.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - A1B1 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 29.65 kDa 
• Atom Count: 2,358 
• Modelled Residue Count: 270 
• Deposited Residue Count: 272 
• Unique protein chains: 2

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
hepatopancreas trypsin	A	237	Astacus leptodactylus	Mutation(s): 1  EC: 3.4.21.4
UniProt
Find proteins for Q52V24 (Astacus leptodactylus) Explore Q52V24  Go to UniProtKB:  Q52V24

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Serine protease inhibitor I/II	B	35	N/A	Mutation(s): 0
UniProt
Find proteins for O46162 (Schistocerca gregaria) Explore O46162  Go to UniProtKB:  O46162

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
CD	C [auth A], D [auth A], E [auth A], F [auth A], G [auth A], H [auth A]	CADMIUM ION Cd WLZRMCYVCSSEQC-UHFFFAOYSA-N
CL	I [auth A], J [auth A]	CHLORIDE ION Cl VEXZGXHMUGYJMC-UHFFFAOYSA-M

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.20 Å
• R-Value Free: 0.182 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 41.283	α = 90
b = 59.673	β = 90
c = 97.302	γ = 90

Software Package:

Software Name	Purpose
MOSFLM	data reduction
SCALA	data scaling
MOLREP	phasing
SHELXL-97	refinement
CCP4	data scaling

Structure Validation

Entry History 

Deposition Data

• Released Date: 2006-04-18 
Deposition Author(s): Fodor, K., Harmat, V., Hetenyi, C., Kardos, J., Antal, J., Perczel, A., Patthy, A., Katona, G., Graf, L.
• This entry supersedes: 1YR4

Revision History  

• Version 1.0: 2006-04-18
  Type: Initial release
  
• Version 1.1: 2008-05-01
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2023-08-30
  Changes: Data collection, Database references, Derived calculations, Refinement description