3D65

Crystal structure of Textilinin-1, a Kunitz-type serine protease inhibitor from the Australian Common Brown snake venom, in complex with trypsin

• PDB DOI: https://doi.org/10.2210/pdb3D65/pdb

• Classification: HYDROLASE INHIBITOR/HYDROLASE
• Organism(s): Pseudonaja textilis textilis, Bos taurus
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2008-05-19 Released: 2009-06-16 
• Deposition Author(s): Millers, E.-K.I., Masci, P.P., Lavin, M.F., de Jersey, J., Guddat, L.W.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.64 Å
• R-Value Free: 
  0.245 (Depositor), 0.240 (DCC) 
• R-Value Work: 
  0.213 (Depositor), 0.210 (DCC) 
• R-Value Observed: 
  0.214 (Depositor) 

Starting Model: experimental

Literature

Crystal structure of Textilinin-1, a Kunitz-type serine protease inhibitor from the Australian Common Brown snake venom, in complex with trypsin

Millers, E.-K.I., Lavin, M.F., de Jersey, J., Masci, P.P., Guddat, L.W.

To be published.

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: 29.82 kDa 
• Atom Count: 2,346 
• Modelled Residue Count: 279 
• Deposited Residue Count: 280 
• Unique protein chains: 2

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Textilinin	A [auth I]	57	Pseudonaja textilis textilis	Mutation(s): 0
UniProt
Find proteins for Q90WA1 (Pseudonaja textilis textilis) Explore Q90WA1  Go to UniProtKB:  Q90WA1

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Cationic trypsin	B [auth E]	223	Bos taurus	Mutation(s): 0  EC: 3.4.21.4
UniProt
Find proteins for P00760 (Bos taurus) Explore P00760  Go to UniProtKB:  P00760

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
CA	C [auth E]	CALCIUM ION Ca BHPQYMZQTOCNFJ-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.64 Å
• R-Value Free:  0.245 (Depositor), 0.240 (DCC) 
• R-Value Work:  0.213 (Depositor), 0.210 (DCC) 
• R-Value Observed: 0.214 (Depositor) 

Space Group: P 3₁ 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 79.838	α = 90
b = 79.838	β = 90
c = 107.394	γ = 120

Software Package:

Software Name	Purpose
REFMAC	refinement
HKL-2000	data collection
HKL-2000	data reduction
HKL-2000	data scaling
EPMR	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 2009-06-16 
Deposition Author(s): Millers, E.-K.I., Masci, P.P., Lavin, M.F., de Jersey, J., Guddat, L.W.

Revision History  

• Version 1.0: 2009-06-16
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Version format compliance
• Version 1.2: 2023-11-01
  Changes: Data collection, Database references, Derived calculations, Refinement description
• Version 1.3: 2024-11-20
  Changes: Structure summary