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(-) Description

Title :  CHYMOTRYPSIN INHIBITOR (C2) FROM NICOTIANA ALATA
 
Authors :  M. C. S. Lee, M. J. Scanlon, M. A. Anderson, D. J. Craik
Date :  11 May 99  (Deposition) - 24 May 99  (Release) - 24 Feb 09  (Revision)
Method :  SOLUTION NMR
Resolution :  NOT APPLICABLE
Chains :  NMR Structure  :  A,B
Keywords :  Proteinase Inhibitor (Chymotrypsin), Serine Proteinase Inhibitor, Potato Ii Trypsin Inhibitor, Nicotiana Alata, Hydrolase Inhibitor (Keyword Search: [Gene Ontology, PubMed, Web (Google)] )
 
Reference :  M. C. Lee, M. J. Scanlon, D. J. Craik, M. A. Anderson
A Novel Two-Chain Proteinase Inhibitor Generated By Circularization Of A Multidomain Precursor Protein.
Nat. Struct. Biol. V. 6 526 1999
PubMed-ID: 10360353  |  Reference-DOI: 10.1038/9293
(for further references see the PDB file header)

(-) Compounds

Molecule 1 - PROTEIN (TRYPSIN INHIBITOR C2)
    Chains: A
    Organ: STIGMA
    Organism Common: PERSIAN TOBACCO
    Organism Scientific: NICOTIANA ALATA
    Organism Taxid: 4087
 
Molecule 2 - PROTEIN (TRYPSIN INHIBITOR C2)
    Chains: B
    Organ: STIGMA
    Organism Common: PERSIAN TOBACCO
    Organism Scientific: NICOTIANA ALATA
    Organism Taxid: 4087

 Structural Features

(-) Chains, Units

  
NMR Structure : 

Summary Information (see also Sequences/Alignments below)

(-) Ligands, Modified Residues, Ions  (0, 0)

(no "Ligand,Modified Residues,Ions" information available for 1QH2)

(-) Sites  (1, 1)

NMR Structure (1, 1)
No.NameEvidenceResiduesDescription
1S1AUTHORLEU A:5 , ASN A:6CHYMOTRYPSIN REACTIVE SITE

(-) SS Bonds  (4, 4)

NMR Structure
No.Residues
1A:3 -B:7
2A:7 -B:3
3A:16 -B:13
4B:6 -B:24

(-) Cis Peptide Bonds  (0, 0)

(no "Cis Peptide Bond" information available for 1QH2)

 Sequence-Structure Mapping

(-) SAPs(SNPs)/Variants  (0, 0)

(no "SAP(SNP)/Variant" information available for 1QH2)

(-) PROSITE Motifs  (0, 0)

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(-) Exons   (0, 0)

(no "Exon" information available for 1QH2)

(-) Sequences/Alignments

NMR Structure
   Reformat: Number of residues per line =  ('0' or empty: single-line sequence representation)
  Number of residues per labelling interval =   
  UniProt sequence: complete  aligned part    
   Show mapping: SCOP domains CATH domains Pfam domains Secondary structure (by author)
SAPs(SNPs) PROSITE motifs Exons
(details for a mapped element are shown in a popup box when the mouse pointer rests over it) 
Chain A from PDB  Type:PROTEIN  Length:18
 aligned with Q40378_NICAL | Q40378 from UniProtKB/TrEMBL  Length:397

    Alignment length:18
                                    97        
         Q40378_NICAL    88 KACTLNCDPRIAYGVCPR 105
               SCOP domains d1qh2.1 B:,A:      SCOP domains
               CATH domains ------------------ CATH domains
               Pfam domains ------------------ Pfam domains
         Sec.struct. author ............eee... Sec.struct. author
                 SAPs(SNPs) ------------------ SAPs(SNPs)
                    PROSITE ------------------ PROSITE
                 Transcript ------------------ Transcript
                 1qh2 A   1 KACTLNCDPRIAYGVCPR  18
                                    10        


Chain B from PDB  Type:PROTEIN  Length:28
 aligned with Q40378_NICAL | Q40378 from UniProtKB/TrEMBL  Length:397

    Alignment length:28
                                   354       364        
         Q40378_NICAL   345 RICTNCCAGKKGCKYFSDDGTFICEGES 372
               SCOP domains d1qh2.1 B:,A:                SCOP domains
               CATH domains ---------------------------- CATH domains
               Pfam domains Prot_inhib_II-1qh2B01     -- Pfam domains
         Sec.struct. author .............eee............ Sec.struct. author
                 SAPs(SNPs) ---------------------------- SAPs(SNPs)
                    PROSITE ---------------------------- PROSITE
                 Transcript ---------------------------- Transcript
                 1qh2 B   1 RICTNCCAGKKGCKYFSDDGTFICEGES  28
                                    10        20
   Legend:   → Mismatch (orange background)
  - → Gap (green background, '-', border residues have a numbering label)
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  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)

NMR Structure
(-)
Class: Small proteins (3458)

(-) CATH Domains  (0, 0)

(no "CATH Domain" information available for 1QH2)

(-) Pfam Domains  (1, 1)

NMR Structure
(-)
Clan: no clan defined [family: Prot_inhib_II] (6)

(-) Gene Ontology  (2, 2)

NMR Structure(hide GO term definitions)
Chain A,B   (Q40378_NICAL | Q40378)
molecular function
    GO:0004867    serine-type endopeptidase inhibitor activity    Stops, prevents or reduces the activity of serine-type endopeptidases, enzymes that catalyze the hydrolysis of nonterminal peptide bonds in a polypeptide chain; a serine residue (and a histidine residue) are at the active center of the enzyme.
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.

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 Related Entries

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UniProtKB/TrEMBL
        Q40378_NICAL | Q40378: 1ce3 1fyb 1tih 1vtp 1ytp 2jyy 2jzm

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