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(-) Description

Title :  PROTEINASE INHIBITOR SSI (STREPTOMYCES SUBTILISIN, INHIBITOR) FROM STREPTOMYCES ALBOGRISEOLUS
 
Authors :  T. Suzuki, T. Nonaka, Y. Mitsui
Date :  01 Mar 96  (Deposition) - 17 Aug 96  (Release) - 24 Feb 09  (Revision)
Method :  X-RAY DIFFRACTION
Resolution :  2.30
Chains :  Asym. Unit :  A
Biol. Unit 1:  A  (2x)
Keywords :  Ssi, Serine Protease Inhibitor, Subtilisin Bpn (Keyword Search: [Gene Ontology, PubMed, Web (Google)] )
 
Reference :  T. Suzuki
Structural Modulation Of The Protein Proteinase Inhibitor Ssi (Streptomyces Subtilisin Inhibitor)
To Be Published
PubMed: search
(for further references see the PDB file header)

(-) Compounds

Molecule 1 - STREPTOMYCES SUBTILISIN INHIBITOR
    Chains: A
    Organism Scientific: STREPTOMYCES ALBOGRISEOLUS
    Organism Taxid: 1887
    Strain: S-3253
    Synonym: SSI

 Structural Features

(-) Chains, Units

  1
Asymmetric Unit : A
Biological Unit 1 (2x): A

Summary Information (see also Sequences/Alignments below)

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

(no "Ligand,Modified Residues,Ions" information available for 3SSI)

(-) Sites  (2, 2)

Asymmetric Unit (2, 2)
No.NameEvidenceResiduesDescription
1PCRUNKNOWNGLU A:67 , ASP A:68 , VAL A:69 , MET A:70 , CYS A:71 , PRO A:72 , MET A:73 , VAL A:74 , TYR A:75THE PRIMARY CONTACT REGION (PCR) CONSISTS OF P7-P2' RESIDUES WHICH INVOLVE THE SCISSILE BOND (OR THE REACTIVE SITE PEPTIDE BOND) AND MAKE CONTACTS WITH THE TARGET ENZYMES.
2SCRUNKNOWNSER A:98 , ASN A:99 , GLU A:100 , CYS A:101 , GLU A:102THE SECONDARY CONTACT REGION (SCR) IS LOCATED CLOSE TO THE PRIMARY CONTACT REGION. THE MAIN ROLE OF THE SCR IS PERHAPS TO STABILIZE THE PRIMARY CONTACT REGION FROM INSIDE OF THE INHIBITOR MOLECULE RATHER THAN TO MAKE INTERACTIONS WITH THE TARGET ENZYMES.

(-) SS Bonds  (2, 2)

Asymmetric Unit
No.Residues
1A:35 -A:50
2A:71 -A:101

(-) Cis Peptide Bonds  (1, 1)

Asymmetric Unit
No.Residues
1Ala A:36 -Pro A:37

 Sequence-Structure Mapping

(-) SAPs(SNPs)/Variants  (0, 0)

(no "SAP(SNP)/Variant" information available for 3SSI)

(-) PROSITE Motifs  (1, 1)

Asymmetric Unit (1, 1)
 PROSITEUniProtKBPDB
No.IDACDescriptionIDLocationCountLocation
1SSIPS00999 Streptomyces subtilisin-type inhibitors signature.SSI_STRAO66-84  1A:35-53
Biological Unit 1 (1, 2)
 PROSITEUniProtKBPDB
No.IDACDescriptionIDLocationCountLocation
1SSIPS00999 Streptomyces subtilisin-type inhibitors signature.SSI_STRAO66-84  2A:35-53

(-) Exons   (0, 0)

(no "Exon" information available for 3SSI)

(-) Sequences/Alignments

Asymmetric Unit
   Reformat: Number of residues per line =  ('0' or empty: single-line sequence representation)
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  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:108
 aligned with SSI_STRAO | P01006 from UniProtKB/Swiss-Prot  Length:144

    Alignment length:108
                                    46        56        66        76        86        96       106       116       126       136        
            SSI_STRAO    37 LYAPSALVLTVGKGVSATTAAPERAVTLTCAPGPSGTHPAAGSACADLAAVGGDLNALTRGEDVMCPMVYDPVLLTVDGVWQGKRVSYERVFSNECEMNAHGSSVFAF 144
               SCOP domains d3ssia_ A: Subtilisin inhibitor                                                                              SCOP domains
               CATH domains 3ssiA00 A:6-113 Subtilisin Inhibitor                                                                         CATH domains
               Pfam domains -SSI-3ssiA01 A:7-100                                                                           ------------- Pfam domains
         Sec.struct. author ....eeeeeeeeee.........eeeeeee.........hhhhhhhhhhhh....................eeeeeeeeee..eeeeeeeee.hhhhhh......... Sec.struct. author
                 SAPs(SNPs) ------------------------------------------------------------------------------------------------------------ SAPs(SNPs)
                    PROSITE -----------------------------SSI  PDB: A:35-53  ------------------------------------------------------------ PROSITE
                 Transcript ------------------------------------------------------------------------------------------------------------ Transcript
                 3ssi A   6 LYAPSALVLTVGKGVSATTAAPERAVTLTCAPGPSGTHPAAGSACADLAAVGGDLNALTRGEDVMCPMVYDPVLLTVDGVWQGKRVSYERVFSNECEMNAHGSSVFAF 113
                                    15        25        35        45        55        65        75        85        95       105
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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)

Asymmetric Unit
(-)
Class: Alpha and beta proteins (a+b) (23004)

(-) CATH Domains  (1, 1)

Asymmetric Unit
(-)
Class: Alpha Beta (26913)

(-) Pfam Domains  (1, 1)

Asymmetric Unit
(-)
Clan: no clan defined [family: SSI] (3)

(-) Gene Ontology  (5, 5)

Asymmetric Unit(hide GO term definitions)
Chain A   (SSI_STRAO | P01006)
molecular function
    GO:0030414    peptidase inhibitor activity    Stops, prevents or reduces the activity of a peptidase, any enzyme that catalyzes the hydrolysis peptide bonds.
    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.
    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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 Related Entries

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

UniProtKB/Swiss-Prot
        SSI_STRAO | P01006: 2sic 2tld 3sic 5sic

(-) Related Entries Specified in the PDB File

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