9BOS | pdb_00009bos

Human mesotrypsin (PRSS3) unliganded and in an active (E) conformation

• PDB DOI: https://doi.org/10.2210/pdb9BOS/pdb

• Classification: HYDROLASE
• Organism(s): Homo sapiens
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): Yes 


• Deposited: 2024-05-06 Released: 2025-06-11 
• Deposition Author(s): Coban, M., Vargas, L.M.F., Sankaran, B., Radisky, E.S.
• Funding Organization(s): National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.70 Å
• R-Value Free: 
  0.262 (Depositor), 0.263 (DCC) 
• R-Value Work: 
  0.240 (Depositor), 0.242 (DCC) 
• R-Value Observed: 
  0.241 (Depositor) 

Starting Model: experimental

Literature

Discovery of an autoinhibited conformation in mesotrypsin reveals a new strategy for selective serine protease inhibition.

Coban, M., Gokara, M., Vargas, L.M.F., Tanzer, S., Zhou, S., Hockla, A., Sankaran, B., Caulfield, T.R., Radisky, E.S.

(2025) Sci Adv 

• DOI: https://doi.org/10.1126/sciadv.adu9129

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Biological Assembly Evidence: homology

Macromolecule Content 

• Total Structure Weight: 24.46 kDa 
• Atom Count: 1,865 
• Modeled Residue Count: 224 
• Deposited Residue Count: 224 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Trypsin-3	A	224	Homo sapiens	Mutation(s): 1  Gene Names: PRSS3, PRSS4, TRY3, TRY4 EC: 3.4.21.4
UniProt & NIH Common Fund Data Resources
Find proteins for P35030 (Homo sapiens) Explore P35030  Go to UniProtKB:  P35030
PHAROS:  P35030 GTEx:  ENSG00000010438

Small Molecules

Ligands 3 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
2F2	D [auth A], E [auth A]	dimethyl ether C2 H6 O LCGLNKUTAGEVQW-UHFFFAOYSA-N
CA	B [auth A]	CALCIUM ION Ca BHPQYMZQTOCNFJ-UHFFFAOYSA-N
CL	C [auth A]	CHLORIDE ION Cl VEXZGXHMUGYJMC-UHFFFAOYSA-M

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.70 Å
• R-Value Free:  0.262 (Depositor), 0.263 (DCC) 
• R-Value Work:  0.240 (Depositor), 0.242 (DCC) 
• R-Value Observed: 0.241 (Depositor) 

Space Group: P 4₁ 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 55.849	α = 90
b = 55.849	β = 90
c = 142.358	γ = 90

Software Package:

Software Name	Purpose
PHENIX	refinement
XDS	data reduction
Aimless	data scaling
PHASER	phasing

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2025-06-11 
Deposition Author(s): Coban, M., Vargas, L.M.F., Sankaran, B., Radisky, E.S.

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Funding Organization	Location	Grant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)	United States	1R01GM144393-01

Revision History  

• Version 1.0: 2025-06-11
  Type: Initial release