1BCS

COMPLEX OF THE WHEAT SERINE CARBOXYPEPTIDASE, CPDW-II, WITH THE MICROBIAL PEPTIDE ALDEHYDE INHIBITOR, CHYMOSTATIN, AND ARGININE AT 100 DEGREES KELVIN


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.08 Å
  • R-Value Observed: 0.174 

wwPDB Validation   3D Report Full Report


This is version 2.1 of the entry. See complete history


Literature

Peptide aldehyde complexes with wheat serine carboxypeptidase II: implications for the catalytic mechanism and substrate specificity.

Bullock, T.L.Breddam, K.Remington, S.J.

(1996) J Mol Biol 255: 714-725

  • DOI: https://doi.org/10.1006/jmbi.1996.0058
  • Primary Citation of Related Structures:  
    1BCR, 1BCS

  • PubMed Abstract: 

    The structures of two ternary complexes of wheat serine carboxypeptidase II (CPD-WII), with a tetrapeptide aldehyde and a reaction product arginine, have been determined by X-ray crystallography at room temperature and -170 degrees. The peptide aldehydes, antipain and chymostatin, form covalent adducts with the active-site serine 146. The CPD-WII antipain arginine model has a standard crystallographic R-factor of 0.162, with good geometry at 2.5 A resolution for data collected at room temperature. The -170 degrees C model of the chymostatin arginine complex has an R-factor of 0.174, with good geometry using data to 2.1 A resolution. The structures suggest binding subsites N-terminal to the scissile bond. All four residues of chymostatin are well-localized in the putative S1 through S4 sites, while density is apparent only in S1 and S2 for antipain. In the S1 site, Val340 and 341, Phe215 and Leu216 form a hydrophobic binding surface, not a pocket, for the P1 phenylalanyl side-chain of chymostatin. The P1 arginyl of antipain also binds at this site, but the positive charge appears to be stabilized by additional solvent molecules. Thus, the hybrid nature of the S1 site accounts for the ability of CPD-WII to accept both hydrophobic and basic residues at P1. Hydrogen bonds to the peptide substrate backbone are few and are made primarily with side-chains on the enzyme. Thus, substrate recognition by CPD-WII appears to have nothing in common with that of the other families of serine proteinases. The hemiacetal linkages to the essential Ser146 are of a single stereoisomer with tetrahedral geometry, with an oxygen atom occupying the "oxyanion hole" region of the enzyme. This atom accepts three hydrogen bonds, two from the polypeptide backbone and one from the positively-charged amino group of bound arginine, and must be negatively charged. Thus, the combination of ligands forms an excellent approximation to the oxyanion intermediate formed during peptide hydrolysis. Surprisingly, the (R) stereochemistry at the hemiacetal linkage is opposite to that expected by comparison to previously determined structures of peptide aldehydes complexed with Streptomyces griseus proteinase A. This is shown to be a consequence of the approximate mirror symmetry of the arrangement of catalytic groups in the two families of serine proteases and suggests that the stereochemical course of the two enzymatic reactions differ in handedness.


  • Organizational Affiliation

    Institute of Molecular Biology, University of Oregon, Eugene 97403, USA.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
SERINE CARBOXYPEPTIDASE II263Triticum aestivumMutation(s): 0 
EC: 3.4.16.6
UniProt
Find proteins for P08819 (Triticum aestivum)
Explore P08819 
Go to UniProtKB:  P08819
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP08819
Sequence Annotations
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
SERINE CARBOXYPEPTIDASE II160Triticum aestivumMutation(s): 0 
EC: 3.4.16.6
UniProt
Find proteins for P08819 (Triticum aestivum)
Explore P08819 
Go to UniProtKB:  P08819
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP08819
Sequence Annotations
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  • Reference Sequence

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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
CHYMOSTATIN A4Streptomyces hygroscopicusMutation(s): 0 
Sequence Annotations
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  • Reference Sequence
Oligosaccharides

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Entity ID: 4
MoleculeChains Length2D Diagram Glycosylation3D Interactions
alpha-L-fucopyranose-(1-3)-[2-acetamido-2-deoxy-alpha-D-glucopyranose-(1-4)]2-acetamido-2-deoxy-beta-D-glucopyranose
D
3N/A
Glycosylation Resources
GlyTouCan:  G91813SF
GlyCosmos:  G91813SF
GlyGen:  G91813SF
Entity ID: 5
MoleculeChains Length2D Diagram Glycosylation3D Interactions
2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose
E
2N/A
Glycosylation Resources
GlyTouCan:  G42666HT
GlyCosmos:  G42666HT
GlyGen:  G42666HT
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
PHA
Query on PHA
C
L-PEPTIDE LINKINGC9 H11 N OPHE
Biologically Interesting Molecules (External Reference) 1 Unique
Entity ID: 3
IDChains NameType/Class2D Diagram3D Interactions
PRD_000558
Query on PRD_000558
C
Chymostatin AOligopeptide / Enzyme inhibitor
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.08 Å
  • R-Value Observed: 0.174 
  • Space Group: P 41 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 95.4α = 90
b = 95.4β = 90
c = 208.3γ = 90
Software Package:
Software NamePurpose
R-AXISdata collection
TNTrefinement
R-AXISdata reduction

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1996-03-08
    Type: Initial release
  • Version 1.1: 2008-03-03
    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 1.3: 2013-02-27
    Changes: Other
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Advisory, Atomic model, Data collection, Derived calculations, Other, Polymer sequence, Structure summary
  • Version 2.1: 2024-11-20
    Changes: Data collection, Database references, Derived calculations, Structure summary