Crystal Structure of Human Kallikrein 7 in Complex with Suc-Ala-Ala-Pro-Phe-chloromethylketone and Copper

Experimental Data Snapshot

  • Resolution: 2.10 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.214 
  • R-Value Observed: 0.214 

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Chymotryptic specificity determinants in the 1.0 A structure of the zinc-inhibited human tissue kallikrein 7.

Debela, M.Hess, P.Magdolen, V.Schechter, N.M.Steiner, T.Huber, R.Bode, W.Goettig, P.

(2007) Proc Natl Acad Sci U S A 104: 16086-16091

  • DOI: https://doi.org/10.1073/pnas.0707811104
  • Primary Citation of Related Structures:  
    2QXG, 2QXH, 2QXI, 2QXJ

  • PubMed Abstract: 

    hK7 or human stratum corneum chymotryptic enzyme belongs to the human tissue kallikrein (hKs) serine proteinase family and is strongly expressed in the upper layers of the epidermis. It participates in skin desquamation but is also implicated in diverse skin diseases and is a potential biomarker of ovarian cancer. We have solved x-ray structures of recombinant active hK7 at medium and atomic resolution in the presence of the inhibitors succinyl-Ala-Ala-Pro-Phe-chloromethyl ketone and Ala-Ala-Phe-chloromethyl ketone. The most distinguishing features of hK7 are the short 70-80 loop and the unique S1 pocket, which prefers P1 Tyr residues, as shown by kinetic data. Similar to several other kallikreins, the enzyme activity is inhibited by Zn(2+) and Cu(2+) at low micromolar concentrations. Biochemical analyses of the mutants H99A and H41F confirm that only the metal-binding site at His(99) close to the catalytic triad accounts for the noncompetitive Zn(2+) inhibition type. Additionally, hK7 exhibits large positively charged surface patches, representing putative exosites for prime side substrate recognition.

  • Organizational Affiliation

    Max-Planck-Institut für Biochemie, Proteinase Research Group, Am Klopferspitz 18, 82152 Martinsried, Germany.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Kallikrein-7224Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for P49862 (Homo sapiens)
Explore P49862 
Go to UniProtKB:  P49862
PHAROS:  P49862
GTEx:  ENSG00000169035 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP49862
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on K7J

Download Ideal Coordinates CCD File 
D [auth A]N-(3-carboxypropanoyl)-L-alanyl-L-alanyl-N-[(2S,3S)-4-chloro-3-hydroxy-1-phenylbutan-2-yl]-L-prolinamide
C25 H35 Cl N4 O7
Query on CU

Download Ideal Coordinates CCD File 
B [auth A],
C [auth A]
Experimental Data & Validation

Experimental Data

  • Resolution: 2.10 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.214 
  • R-Value Observed: 0.214 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 45.609α = 90
b = 41.155β = 92.94
c = 52.742γ = 90
Software Package:
Software NamePurpose
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2008-01-08
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2023-08-30
    Changes: Data collection, Database references, Derived calculations, Refinement description