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(-) Description

Authors :  W. Bode, D. Musil, R. Huber
Date :  21 Apr 93  (Deposition) - 31 Jan 94  (Release) - 07 Sep 11  (Revision)
Resolution :  2.00
Chains :  Asym./Biol. Unit :  I
Keywords :  Proteinase Inhibitor(Cysteine) (Keyword Search: [Gene Ontology, PubMed, Web (Google))
Reference :  W. Bode, R. Engh, D. Musil, U. Thiele, R. Huber, A. Karshikov, J. Brzin, J. Kos, V. Turk
The 2. 0 A X-Ray Crystal Structure Of Chicken Egg White Cystatin And Its Possible Mode Of Interaction With Cysteine Proteinases.
Embo J. V. 7 2593 1988
PubMed-ID: 3191914
(for further references see the PDB file header)

(-) Compounds

Molecule 1 - CYSTATIN
    Organism CommonCHICKEN
    Organism ScientificGALLUS GALLUS
    Organism Taxid9031

 Structural Features

(-) Chains, Units

Asymmetric/Biological Unit I

Summary Information (see also Sequences/Alignments below)

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(-) Sites  (0, 0)

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(-) SS Bonds  (2, 2)

Asymmetric/Biological Unit
1I:71 -I:81
2I:95 -I:115

(-) Cis Peptide Bonds  (0, 0)

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 Sequence-Structure Mapping

(-) SAPs(SNPs)/Variants  (0, 0)

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(-) PROSITE Motifs  (1, 1)

Asymmetric/Biological Unit (1, 1)
1CYSTATINPS00287 Cysteine proteases inhibitors signature.CYT_CHICK75-88  1I:52-65

(-) Exons   (0, 0)

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(-) Sequences/Alignments

Asymmetric/Biological Unit
   Reformat: Number of residues per line =  ('0' or empty: single-line sequence representation)
  Number of residues per labelling interval =   
  UniProt sequence: complete  aligned part    
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SAPs(SNPs) PROSITE motifs Exons
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Chain I from PDB  Type:PROTEIN  Length:108
 aligned with CYT_CHICK | P01038 from UniProtKB/Swiss-Prot  Length:139

    Alignment length:108
                                    41        51        61        71        81        91       101       111       121       131        
               SCOP domains d1cewi_ I: Cystatin                                                                                          SCOP domains
               CATH domains 1cewI00 I:9-116  [code=3.10.450.10, no name defined]                                                         CATH domains
               Pfam domains ------------------------------------------------------------------------------------------------------------ Pfam domains
         Sec.struct. author Sec.struct. author
                 SAPs(SNPs) ------------------------------------------------------------------------------------------------------------ SAPs(SNPs)
                    PROSITE -------------------------------------------CYSTATIN      --------------------------------------------------- PROSITE
                 Transcript ------------------------------------------------------------------------------------------------------------ Transcript
                                    18        28        38        48        58        68        78        88        98       108        

   Legend:   → Mismatch (orange background)
  - → Gap (green background, '-', border residues have a numbering label)
    → Modified Residue (blue background, lower-case, 'x' indicates undefined single-letter code, labelled with number + name)
  x → Chemical Group (purple background, 'x', labelled with number + name, e.g. ACE or NH2)
  extra numbering lines below/above indicate numbering irregularities and modified residue names etc., number ends below/above '|'

 Classification and Annotation

(-) SCOP Domains  (1, 1)

Asymmetric/Biological Unit

(-) CATH Domains  (1, 1)

Asymmetric/Biological Unit
Class: Alpha Beta (26913)

(-) Pfam Domains  (0, 0)

(no "Pfam Domain" information available for 1CEW)

(-) Gene Ontology  (5, 5)

Asymmetric/Biological Unit(hide GO term definitions)
Chain I   (CYT_CHICK | P01038)
molecular function
    GO:0004869    cysteine-type endopeptidase inhibitor activity    Stops, prevents or reduces the activity of a cysteine-type endopeptidase, any enzyme that hydrolyzes peptide bonds in polypeptides by a mechanism in which the sulfhydryl group of a cysteine residue at the active center acts as a nucleophile.
    GO:0030414    peptidase inhibitor activity    Stops, prevents or reduces the activity of a peptidase, any enzyme that catalyzes the hydrolysis peptide bonds.
biological process
    GO:0010951    negative regulation of endopeptidase activity    Any process that decreases the frequency, rate or extent of endopeptidase activity, the endohydrolysis of peptide bonds within proteins.
    GO:0010466    negative regulation of peptidase activity    Any process that stops or reduces the rate of peptidase activity, the hydrolysis of peptide bonds within proteins.
cellular component
    GO:0005576    extracellular region    The space external to the outermost structure of a cell. For cells without external protective or external encapsulating structures this refers to space outside of the plasma membrane. This term covers the host cell environment outside an intracellular parasite.


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the following image was kindly provided by the protease and protease inhibitor web server prolysis.
  Chicken cystatin (ribbon representation). The inhibitory site is formed by the juxtaposition of 3 regions (regions 1, 2 and 3). The first one includes a conserved Gly9 residue, the second one forms a beta-turn containing the QVVAG consensus sequence and the third region comprises a Pro-Trp sequence which als form a beta-turn. The molecule represented here is N-terminally truncated. The N-ter region has been shown to stabilizise the enzyme-inhibitor complex since N-ter truncation up to Gly9 leads to a 10,000 fold loss of affinity for papain (mono).
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  representative atom: CA

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 Related Entries

(-) Entries Sharing at Least One Protein Chain (UniProt ID)

        CYT_CHICK | P010381a67 1a90 1yvb

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