1N6E

tricorn protease in complex with a tridecapeptide chloromethyl ketone derivative

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.288 
  • R-Value Work: 0.254 
  • R-Value Observed: 0.254 

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This is version 1.2 of the entry. See complete history. 


Literature

Navigation Inside a Protease: Substrate Selection and Product Exit in the Tricorn Protease from Thermoplasma acidophilum

Kim, J.-S., Groll, M., Musiol, H.-J., Behrendt, R., Kaiser, M., Moroder, L., Huber, R., Brandstetter, H.

(2002) J Mol Biol 324: 1041-1050

  • DOI: 10.1016/s0022-2836(02)01153-1
  • Primary Citation of Related Structures:  
    1N6F, 1N6E, 1N6D

  • PubMed Abstract: 

    • The proposed pathway and mechanism of substrate entry and product egress in the hexameric D3 symmetric tricorn protease from Thermoplasma acidophilum were explored by crystallographic studies of ligand complexes and by structure-based mutagenesis. Obstru ...

    The proposed pathway and mechanism of substrate entry and product egress in the hexameric D3 symmetric tricorn protease from Thermoplasma acidophilum were explored by crystallographic studies of ligand complexes and by structure-based mutagenesis. Obstruction of the pore within the 7-bladed beta-propeller (beta7) domain by alkylation or oxidation of an engineered double cysteine mutant strongly decreased enzymatic activities. In line herewith, the crystal structure of the tricorn protease in complex with a trideca-peptide inhibitor modifying the catalytic Ser965 revealed part of the peptide trapped inside the channel of the beta7 domain. The cysteine mutation widening the lumen of the 6-bladed beta-propeller (beta6) domain enhanced catalytic activity, which was restored to normal values after its alkylation. A charge reversal mutant at the putative anchor site of the substrate C terminus, R131E-R132E, drastically reduced the proteolytic activity. The complex crystal structure of a peptide inhibitor with a diketo group at the cleavage site mapped the substrate recognition site and confirmed the role of Arg131-Arg132 as an anchor site. Our results strongly suggest the wider beta7 domain to serve as a selective filter and guide of the substrate to the sequestered active site, while the narrower beta6 domain routes the product to the surface. Moreover, we identified the role of Arg131-Arg132 in anchoring the substrate C terminus.

    Organizational Affiliation: 

    Max-Planck-Institut für Biochemie, Am Klopferspitz 18a, D-82152 Planegg-Martinsried, Germany. jkim@biochem.mpg.de



Macromolecules
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(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
tricorn protease A, C, E, G, I, K1071Thermoplasma acidophilumMutation(s): 0 
EC: 3.4.21
Find proteins for P96086 (Thermoplasma acidophilum (strain ATCC 25905 / DSM 1728 / JCM 9062 / NBRC 15155 / AMRC-C165))
Explore P96086 
Go to UniProtKB:  P96086
Protein Feature View
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  • Reference Sequence
  • Find similar proteins by:  Sequence   |   Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
DQTQKAAAELTFF B, D, F, H, J, L13N/AMutation(s): 0 
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.288 
  • R-Value Work: 0.254 
  • R-Value Observed: 0.254 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 95.47α = 90
b = 245.1β = 105.19
c = 157.89γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
CNSrefinement
CNSphasing

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2002-12-30
    Type: Initial release
  • Version 1.1: 2008-04-28
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance