1NB5

Crystal structure of stefin A in complex with cathepsin H

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.274 
  • R-Value Work: 0.235 

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Literature

Crystal structure of stefin A in complex with cathepsin H: N-terminal residues of inhibitors can adapt to the active sites of endo- and exopeptidases

Jenko, S., Dolenc, I., Guncar, G., Dobersek, A., Podobnik, M., Turk, D.

(2003) J Mol Biol 326: 875-885

  • DOI: 10.1016/s0022-2836(02)01432-8
  • Primary Citation of Related Structures:  
    1NB3, 1NB5

  • PubMed Abstract: 

    • Binding of cystatin-type inhibitors to papain-like exopeptidases cannot be explained by the stefin B-papain complex. The crystal structure of human stefin A bound to an aminopeptidase, porcine cathepsin H, has been determined in monoclinic and orthorhombic crystal forms at 2 ...

    Binding of cystatin-type inhibitors to papain-like exopeptidases cannot be explained by the stefin B-papain complex. The crystal structure of human stefin A bound to an aminopeptidase, porcine cathepsin H, has been determined in monoclinic and orthorhombic crystal forms at 2.8A and 2.4A resolutions, respectively. The asymmetric unit of each form contains four complexes. The structures are similar to the stefin B-papain complex, but with a few distinct differences. On binding, the N-terminal residues of stefin A adopt the form of a hook, which pushes away cathepsin H mini-chain residues and distorts the structure of the short four residue insertion (Lys155A-Asp155D) unique to cathepsin H. Comparison with the structure of isolated cathepsin H shows that the rims of the cathepsin H structure are slightly displaced (up to 1A) from their position in the free enzyme. Furthermore, comparison with the stefin B-papain complex showed that molecules of stefin A bind about 0.8A deeper into the active site cleft of cathepsin H than stefin B into papain. The approach of stefin A to cathepsin H induces structural changes along the interaction surface of both molecules, whereas no such changes were observed in the stefin B-papain complex. Carboxymethylation of papain seems to have prevented the formation of the genuine binding geometry between a papain-like enzyme and a cystatin-type inhibitor as we observe it in the structure presented here.

    Organizational Affiliation: 

    Department of Biochemistry and Molecular Biology, Jozef Stefan Institute, Jamova 39, SI-1111 Ljubljana, Slovenia.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Cathepsin HA,
D [auth B],
G [auth C],
J [auth D]		220Sus scrofaMutation(s): 0 
Gene Names: CTSH
EC: 3.4.22.16
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Find proteins for O46427 (Sus scrofa)
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UniProt GroupO46427
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Cathepsin H MINI CHAINB [auth P],
E [auth R],
H [auth S],
K [auth T]		8Sus scrofaMutation(s): 0 
Gene Names: CTSH
EC: 3.4.22.16
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
STEFIN AC [auth I],
F [auth J],
I [auth K],
L		98Homo sapiensMutation(s): 0 
Gene Names: CSTA OR STF1, CSTA, STF1, STFA
UniProt & NIH Common Fund Data Resources
Find proteins for P01040 (Homo sapiens)
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Go to UniProtKB:  P01040
PHAROS:  P01040
GTEx:  ENSG00000121552 
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UniProt GroupP01040
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Oligosaccharides

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Entity ID: 4
MoleculeChainsChain Length2D DiagramGlycosylation3D Interactions
beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranoseM [auth E],
N [auth F],
O [auth G],
P [auth H]		3N-Glycosylation Oligosaccharides Interaction
Glycosylation Resources
GlyTouCan:  G15407YE
GlyCosmos:  G15407YE
GlyGen:  G15407YE
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.274 
  • R-Value Work: 0.235 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 91.629α = 90
b = 97.575β = 90
c = 162.188γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
AMoREphasing
MAINrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2003-02-18
    Type: Initial release
  • Version 1.1: 2008-04-28
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Atomic model, Database references, Derived calculations, Non-polymer description, Structure summary, Version format compliance
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Advisory, Atomic model, Data collection, Derived calculations, Structure summary