Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Hetero 4-mer - A2B2 

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

Biological Assembly 2  

 3D View: Structure | Electron Density | Ligand Interaction

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

Biological assembly 2 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 34.34 kDa 
• Atom Count: 2482 
• Modelled Residue Count: 278 
• Deposited Residue Count: 295 
• Unique protein chains: 2

3JZ1

Crystal structure of human thrombin mutant N143P in E:Na+ form

• DOI: 10.2210/pdb3JZ1/pdb

• Classification: HYDROLASE
• Organism(s): Homo sapiens
• Expression System: Cricetulus griseus
• Mutation(s): Yes 


• Deposited: 2009-09-22 Released: 2009-10-20 
• Deposition Author(s): Niu, W., Chen, Z., Bush-Pelc, L.A., Bah, A., Gandhi, P.S., Di Cera, E.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.60 Å
• R-Value Free: 0.216 
• R-Value Work: 0.203 
• R-Value Observed: 0.203 

Literature

Mutant N143P reveals how Na+ activates thrombin

Niu, W., Chen, Z., Bush-Pelc, L.A., Bah, A., Gandhi, P.S., Di Cera, E.

(2009) J Biol Chem 284: 36175-36185

• PubMed: 19846563 
• DOI: 10.1074/jbc.M109.069500
• Primary Citation of Related Structures:  
  3JZ1, 3JZ2


• PubMed Abstract: 
  

The molecular mechanism of thrombin activation by Na(+) remains elusive. Its kinetic formulation requires extension of the classical Botts-Morales theory for the action of a modifier on an enzyme to correctly account for the contribution of the E*, E, and E:Na(+) forms. The extended scheme establishes that analysis of k(cat) unequivocally identifies allosteric transduction of Na(+) binding into enhanced catalytic activity. The thrombin mutant N143P features no Na(+)-dependent enhancement of k(cat) yet binds Na(+) with an affinity comparable to that of wild type. Crystal structures of the mutant in the presence and absence of Na(+) confirm that Pro(143) abrogates the important H-bond between the backbone N atom of residue 143 and the carbonyl O atom of Glu(192), which in turn controls the orientation of the Glu(192)-Gly(193) peptide bond and the correct architecture of the oxyanion hole. We conclude that Na(+) activates thrombin by securing the correct orientation of the Glu(192)-Gly(193) peptide bond, which is likely flipped in the absence of cation. Absolute conservation of the 143-192 H-bond in trypsin-like proteases and the importance of the oxyanion hole in protease function suggest that this mechanism of Na(+) activation is present in all Na(+)-activated trypsin-like proteases.

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Related Citations: 

• Molecular dissection of Na+ binding to thrombin
  Pineda, A.O., Carrell, C.J., Bush, L.A., Prasad, S., Caccia, S., Chen, Z., Mathews, F.S., Di Cera, E.
  (2004) J Biol Chem 279: 31842

• Structural identification of the pathway of long-range communication in an allosteric enzyme
  Gandhi, P.S., Chen, Z., Mathews, F.S., Di Cera, E.
  (2009) Proc Natl Acad Sci U S A 105: 1832

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Organizational Affiliation: 

Department of Biochemistry and Molecular Biophysics, Washington University School of Medicine, St. Louis, Missouri 63110, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Thrombin light chain	A	36	Homo sapiens	Mutation(s): 0  Gene Names: F2 EC: 3.4.21.5
Find proteins for P00734 (Homo sapiens) Explore P00734  Go to UniProtKB:  P00734
NIH Common Fund Data Resources
PHAROS:  P00734 GTEx:  ENSG00000180210

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Thrombin heavy chain	B	259	Homo sapiens	Mutation(s): 1  Gene Names: F2 EC: 3.4.21.5
Find proteins for P00734 (Homo sapiens) Explore P00734  Go to UniProtKB:  P00734
NIH Common Fund Data Resources
PHAROS:  P00734 GTEx:  ENSG00000180210

Small Molecules

Ligands 4 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
NAG	B	2-acetamido-2-deoxy-beta-D-glucopyranose C8 H15 N O6 OVRNDRQMDRJTHS-FMDGEEDCSA-N
GOL	B	GLYCEROL C3 H8 O3 PEDCQBHIVMGVHV-UHFFFAOYSA-N
NO3	A, B	NITRATE ION N O3 NHNBFGGVMKEFGY-UHFFFAOYSA-N
NA	A, B	SODIUM ION Na FKNQFGJONOIPTF-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.60 Å
• R-Value Free: 0.216 
• R-Value Work: 0.203 
• R-Value Observed: 0.203 
• Space Group: C 1 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 119.979	α = 90
b = 47.67	β = 92.29
c = 50.688	γ = 90

Software Package:

Software Name	Purpose
ADSC	data collection
MOLREP	phasing
CNS	refinement
HKL-2000	data reduction
HKL-2000	data scaling

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2009-09-22 
• Released Date: 2009-10-20 
Deposition Author(s): Niu, W., Chen, Z., Bush-Pelc, L.A., Bah, A., Gandhi, P.S., Di Cera, E.

Revision History  

• Version 1.0: 2009-10-20
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Non-polymer description, Version format compliance
• Version 1.2: 2020-07-29
  Type: Remediation
  Reason: Carbohydrate remediation
  Changes: Data collection, Derived calculations, Structure summary