1NN6

Human Pro-Chymase


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.75 Å
  • R-Value Free: 0.245 
  • R-Value Work: 0.203 
  • R-Value Observed: 0.205 

wwPDB Validation   3D Report Full Report



Literature

Structure of human pro-chymase: a model for the activating transition of granule-associated proteases.

Reiling, K.K.Krucinski, J.Miercke, L.J.Raymond, W.W.Caughey, G.H.Stroud, R.M.

(2003) Biochemistry 42: 2616-2624

  • DOI: 10.1021/bi020594d
  • Primary Citation of Related Structures:  
    1NN6

  • PubMed Abstract: 
  • Human chymase is a protease involved in physiological processes ranging from inflammation to hypertension. As are all proteases of the trypsin fold, chymase is synthesized as an inactive "zymogen" with an N-terminal pro region that prevents the trans ...

    Human chymase is a protease involved in physiological processes ranging from inflammation to hypertension. As are all proteases of the trypsin fold, chymase is synthesized as an inactive "zymogen" with an N-terminal pro region that prevents the transition of the zymogen to an activated conformation. The 1.8 A structure of pro-chymase, reported here, is the first zymogen with a dipeptide pro region (glycine-glutamate) to be characterized at atomic resolution. Three segments of the pro-chymase structure differ from that of the activated enzyme: the N-terminus (Gly14-Gly19), the autolysis loop (Gly142-Thr154), and the 180s loop (Pro185A-Asp194). The four N-terminal residues (Gly14-Glu15-Ile16-Ile17) are disordered. The autolysis loop occupies a position up to 10 A closer to the active site than is seen in the activated enzyme, thereby forming a hydrogen bond with the catalytic residue Ser195 and occluding the S1' binding pocket. Nevertheless, the catalytic triad (Asp102-His57-Ser195) is arrayed in a geometry close to that seen in activated chymase (all atom rmsd of 0.52 A). The 180s loop of pro-chymase is, on average, 4 A removed from its conformation in the activated enzyme. This conformation disconnects the oxyanion hole (the amides of Gly193 and Ser195) from the active site and positions only approximately 35% of the S1-S3 binding pockets in the active conformation. The backbone of residue Asp194 is rotated 180 degrees when compared to its conformation in the activated enzyme, allowing a hydrogen bond between the main-chain amide of residue Trp141 and the carboxylate of Asp194. The side chains of residues Phe191 and Lys192 of pro-chymase fill the Ile16 binding pocket and the base of the S1 binding pocket, respectively. The zymogen positioning of both the 180s and autolysis loops are synergistic structural elements that appear to prevent premature proteolysis by chymase and, quite possibly, by other dipeptide zymogens.


    Related Citations: 
    • Crystal structure of phenylmethanesulfonyl fluoride-treated human chymase at 1.9 A
      McGrath, M.E., Mirzadegan, T., Schmidt, B.F.
      (1997) Biochemistry 36: 14318
    • The 2.2 A Crystal Structure of Human Chymase in Complex with Succinyl-Ala-Ala-Pro-Phe-chloromethylketone: Structural Explanation for its Dipeptidyl Carboxypeptidase Specificity
      Pereira, P.J., Wang, Z.M., Rubin, H., Huber, R., Bode, W., Schechter, N.M., Strobl, S.
      (1999) J Mol Biol 286: 163
    • Structure of bovine trypsinogen at 1.9 A resolution.
      Kossiakoff, A.A., Chambers, J.L., Kay, L.M., Stroud, R.M.
      (1977) Biochemistry 16: 654
    • Structure, chromosomal assignment, and deduced amino acid sequence of a human gene for mast cell chymase.
      Caughey, G.H., Zerweck, E.H., Vanderslice, P.
      (1991) J Biol Chem 266: 12956

    Organizational Affiliation

    Department of Biochemistry and Biophysics, University of California at San Francisco, San Francisco, California 94143, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
ChymaseA228Homo sapiensMutation(s): 0 
Gene Names: Human mast cell chymase geneCMA1CYHCYM
EC: 3.4.21.39
Find proteins for P23946 (Homo sapiens)
Explore P23946 
Go to UniProtKB:  P23946
NIH Common Fund Data Resources
PHAROS  P23946
Protein Feature View
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  • Reference Sequence
Oligosaccharides

Help

Entity ID: 2
MoleculeChainsChain Length2D Diagram Glycosylation3D Interactions
2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose
B
2 N-Glycosylation Oligosaccharides Interaction
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NAG
Query on NAG

Download CCD File 
A
2-acetamido-2-deoxy-beta-D-glucopyranose
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.75 Å
  • R-Value Free: 0.245 
  • R-Value Work: 0.203 
  • R-Value Observed: 0.205 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 50.688α = 90
b = 55.639β = 90
c = 88.686γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
DENZOdata reduction
SCALEPACKdata scaling
AMoREphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2003-03-04
    Type: Initial release
  • Version 1.1: 2008-04-29
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Non-polymer description, Version format compliance
  • Version 1.3: 2018-01-31
    Changes: Database references
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Advisory, Atomic model, Data collection, Derived calculations, Structure summary