1ELT

STRUCTURE OF NATIVE PANCREATIC ELASTASE FROM NORTH ATLANTIC SALMON AT 1.61 ANGSTROMS RESOLUTION


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.61 Å
  • R-Value Free: 0.239 
  • R-Value Observed: 0.172 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Structure of native pancreatic elastase from North Atlantic salmon at 1.61 A resolution.

Berglund, G.I.Willassen, N.P.Hordvik, A.Smalas, A.O.

(1995) Acta Crystallogr D Biol Crystallogr 51: 925-937

  • DOI: 10.1107/S0907444995004835
  • Primary Citation of Related Structures:  
    1ELT

  • PubMed Abstract: 
  • The crystal structure of native salmon pancreatic elastase (SPE) has been solved by molecular-replacement methods, and refined by conventional conjugate-gradient methods and simulated-annealing techniques. The final R value is 17.2% for 21 389 reflec ...

    The crystal structure of native salmon pancreatic elastase (SPE) has been solved by molecular-replacement methods, and refined by conventional conjugate-gradient methods and simulated-annealing techniques. The final R value is 17.2% for 21 389 reflections between 8.0 and 1.61 A, and the corresponding free R value is 23.9%. The overall tertiary structure of SPE is remarkably similar to that of porcine pancreatic elastase I (PPE), to which it shows about 67% sequence identity. The primary structure of SPE is determined from the electron-density maps, and only about 15 side chains are somewhat uncertain. Interesting differences between SPE and PPE, are one sequence deletion assigned to position 186, the residue 192 at the entrance of the specificity pocket is substituted from a Gln in PPE to Asn in SPE, and one of the calcium ligands is different. Furthermore, electron density is missing in SPE for the last three residues of the C-terminal helix. A comparison of the present amino-acid sequence of SPE with other sequences available indicates that SPE belongs to the class 1 pancreatic elastases.


    Related Citations: 
    • Crystallization and Preliminary X-Ray Crystallographic Studies of Native Elastase from North Atlantic Salmon (Salmo Salar)
      Berglund, G.I., Smalaas, A.O., Hansen, L.Kr., Willassen, N.P.
      () To be published --: --
    • Human Leukocyte and Porcine Pancreatic Elastase: X-Ray Crystal Structures, Mechanism, Substrate Specificity, and Mechanism-Based Inhibitors
      Bode, W., Meyer, E., Powers, J.C.
      (1989) Biochemistry 28: 1951
    • Structure of Native Porcine Pancreatic Elastase at 1.65 Angstroms Resolution
      Meyer, E., Cole, G., Radhakrishnan, R.
      (1988) Acta Crystallogr B 44: 26

    Organizational Affiliation

    Protein Crystallography Group, Department of Chemistry, Institute of Mathematical and Physical Sciences, University of Tromsø, Norway.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
ELASTASEA236Salmo salarMutation(s): 0 
EC: 3.4.21.36
Find proteins for Q7SIG3 (Salmo salar)
Explore Q7SIG3 
Go to UniProtKB:  Q7SIG3
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CA
Query on CA

Download CCD File 
A
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.61 Å
  • R-Value Free: 0.239 
  • R-Value Observed: 0.172 
  • Space Group: P 41 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 68α = 90
b = 68β = 90
c = 83.98γ = 90
Software Package:
Software NamePurpose
PROCORdata collection
X-PLORmodel building
PROLSQrefinement
X-PLORrefinement
PROCORdata reduction
X-PLORphasing

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1996-01-01
    Type: Initial release
  • Version 1.1: 2008-03-24
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2018-04-18
    Changes: Data collection, Other