1MEE

THE COMPLEX BETWEEN THE SUBTILISIN FROM A MESOPHILIC BACTERIUM AND THE LEECH INHIBITOR EGLIN-C

• PDB DOI: https://doi.org/10.2210/pdb1MEE/pdb

• Classification: COMPLEX(SERINE PROTEINASE-INHIBITOR)
• Organism(s): Bacillus pumilus, Hirudo medicinalis
• Mutation(s): No 


• Deposited: 1991-04-15 Released: 1992-10-15 
• Deposition Author(s): Dauter, Z., Betzel, C., Wilson, K.S.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.00 Å
• R-Value Work: 
  0.140 (DCC) 
• R-Value Observed: 
  0.151 (Depositor) 

Literature

Complex between the subtilisin from a mesophilic bacterium and the leech inhibitor eglin-C.

Dauter, Z., Betzel, C., Genov, N., Pipon, N., Wilson, K.S.

(1991) Acta Crystallogr B 47: 707-730

• PubMed: 1793542 
• DOI: https://doi.org/10.1107/s0108768191004202
• Primary Citation of Related Structures:  
  1MEE


• PubMed Abstract: 
  

  The alkaline proteinase from the mesophilic bacterium Bacillus mesentericus has been crystallized in a 1:1 complex with the inhibitor eglin-C from the medical leech. The crystals have cell dimensions of a = 43.0, b = 71.9, c = 48.3 A and beta = 110.0 degrees and are in the space group P2(1). Three-dimensional data to 2.0 A have been recorded on film from a single crystal. The orientation and position of the complex in the unit cell have been established using the refined coordinates of subtilisin Carlsberg and of eglin-C as independent models. The structure of the complex has been refined by restrained least-squares minimization. The crystallographic R factor (= sigma[magnitude of Fo - magnitude of Fc[/sigma magnitude of Fo) is 15.1% including two Ca2+ ions and 312 water molecules. The structure is discussed in terms of its physicochemical properties in solution and its relation to other Bacillus subtilisins.

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Organizational Affiliation: 

European Molecular Biology Laboratory (EMBL), Hamburg, Germany.

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: 35.2 kDa 
• Atom Count: 2,792 
• Modelled Residue Count: 339 
• Deposited Residue Count: 339 
• Unique protein chains: 2

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
MESENTERICOPEPTIDASE	A	275	Bacillus pumilus	Mutation(s): 0  EC: 3.4.21.14 (PDB Primary Data), 3.4.21.62 (UniProt)
UniProt
Find proteins for P07518 (Bacillus pumilus) Explore P07518  Go to UniProtKB:  P07518

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
EGLIN C	B [auth I]	64	Hirudo medicinalis	Mutation(s): 0
UniProt
Find proteins for P01051 (Hirudo medicinalis) Explore P01051  Go to UniProtKB:  P01051

Small Molecules

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

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.00 Å
• R-Value Work:  0.140 (DCC) 
• R-Value Observed: 0.151 (Depositor) 

Space Group: P 1 2₁ 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 42.98	α = 90
b = 71.85	β = 110
c = 48.34	γ = 90

Software Package:

Software Name	Purpose
PROLSQ	refinement

Structure Validation

Entry History 

Deposition Data

• Released Date: 1992-10-15 
Deposition Author(s): Dauter, Z., Betzel, C., Wilson, K.S.

Revision History  

• Version 1.0: 1992-10-15
  Type: Initial release
  
• Version 1.1: 2008-03-03
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2024-02-14
  Changes: Data collection, Database references, Derived calculations, Other