1CQ4 - JenaLib

Title :   CI2 MUTANT WITH TETRAGLUTAMINE (MGQQQQGM) REPLACING MET59

Authors :   Y. W. Chen, K. R. Stott

Date :   17 Nov 98 (Deposition) - 25 Nov 98 (Release) - 13 Jul 11 (Revision)

Method :   X-RAY DIFFRACTION

Resolution :   1.80

Chains :   Asym. Unit : A,B
Biol. Unit 1: A,B  (2x)
Biol. Unit 2: A,B  (6x)
Biol. Unit 3: A,B  (12x)

Keywords :   Serine Protease Inhibitor, Polyglutamine Insertion Mutant, Subtilisin- Chymotrypsin Inhibitor-2, Immune System, Hydrolase Inhibitor (Keyword Search: [Gene Ontology, PubMed, Web (Google)] )

Reference :   Y. W. Chen, K. Stott, M. F. Perutz
Crystal Structure Of A Dimeric Chymotrypsin Inhibitor 2 Mutant Containing An Inserted Glutamine Repeat.
Proc. Natl. Acad. Sci. Usa V. 96 1257 1999
PubMed-ID: 9990011 | Reference-DOI: 10.1073/PNAS.96.4.1257
(for further references see the PDB file header)

Compounds

Molecule 1 - PROTEIN (SERINE PROTEINASE INHIBITOR 2)
	Chains	:	A
	Engineered	:	YES
	Expression System	:	ESCHERICHIA COLI
	Expression System Plasmid	:	PCI2-Q4I
	Expression System Taxid	:	562
	Expression System Variant	:	NM554
	Mutation	:	YES
	Organism Scientific	:	HORDEUM VULGARE
	Organism Taxid	:	4513
	Other Details	:	EXISTS AS A1B2/A2B1 DOMAIN-SWAPPED DIMER
	Strain	:	HIPROLY
	Synonym	:	CHYMOTRYPSIN INHIBITOR 2, CI2

Molecule 2 - PROTEIN (SERINE PROTEINASE INHIBITOR 2)
	Chains	:	B
	Engineered	:	YES
	Expression System	:	ESCHERICHIA COLI
	Expression System Plasmid	:	PCI2-Q4I
	Expression System Taxid	:	562
	Expression System Variant	:	NM554
	Mutation	:	YES
	Organism Scientific	:	HORDEUM VULGARE
	Organism Taxid	:	4513
	Other Details	:	EXISTS AS A1B2/A2B1 DOMAIN-SWAPPED DIMER
	Strain	:	HIPROLY
	Synonym	:	CHYMOTRYPSIN INHIBITOR 2, CI2

Structural Features

Chains, Units

Ligands, Modified Residues, Ions (1, 1)

Sites (1, 1)

SS Bonds (0, 0)

Cis Peptide Bonds (0, 0)

Sequence-Structure Mapping

SAPs(SNPs)/Variants (0, 0)

PROSITE Motifs (1, 1)

Asymmetric Unit (1, 1)

	PROSITE			UniProtKB		PDB
No.	ID	AC	Description	ID	Location	Count	Location
1	POTATO_INHIBITOR	PS00285	Potato inhibitor I family signature.	ICI2_HORVU	25-36	1	A:24-35

Biological Unit 1 (1, 2)

	PROSITE			UniProtKB		PDB
No.	ID	AC	Description	ID	Location	Count	Location
1	POTATO_INHIBITOR	PS00285	Potato inhibitor I family signature.	ICI2_HORVU	25-36	2	A:24-35

Biological Unit 2 (1, 6)

	PROSITE			UniProtKB		PDB
No.	ID	AC	Description	ID	Location	Count	Location
1	POTATO_INHIBITOR	PS00285	Potato inhibitor I family signature.	ICI2_HORVU	25-36	6	A:24-35

Biological Unit 3 (1, 12)

	PROSITE			UniProtKB		PDB
No.	ID	AC	Description	ID	Location	Count	Location
1	POTATO_INHIBITOR	PS00285	Potato inhibitor I family signature.	ICI2_HORVU	25-36	12	A:24-35

Exons (0, 0)

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

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Chain A from PDB  Type:PROTEIN  Length:37
 aligned with ICI2_HORVU | P01053 from UniProtKB/Swiss-Prot  Length:84

    Alignment length:37
                                    31        41        51       
            ICI2_HORVU   22 KTEWPELVGKSVEEAKKVILQDKPEAQIIVLPVGTIV 58
               SCOP domains d1cq4.1 A:,B:                         SCOP domains
               CATH domains 1cq4A00 A:21-57                       CATH domains
               Pfam domains ------------------------------------- Pfam domains
         Sec.struct. author ...hhhhh..hhhhhhhhhhhhh.............. Sec.struct. author
                 SAPs(SNPs) ------------------------------------- SAPs(SNPs)
                    PROSITE ---POTATO_INHIB---------------------- PROSITE
                 Transcript ------------------------------------- Transcript
                  1cq4 A 21 KTEWPELVGKSVEEAKKVILQDKPEAQIIVLPVGTIV 57
                                    30        40        50

Chain B from PDB  Type:PROTEIN  Length:23
 aligned with ICI2_HORVU | P01053 from UniProtKB/Swiss-Prot  Length:84

    Alignment length:23
                                    71        81   
            ICI2_HORVU   62 YRIDRVRLFVDKLDNIAQVPRVG 84
               SCOP domains d1cq4.1 A:,B:           SCOP domains
               CATH domains ----------------------- CATH domains
               Pfam domains ----------------------- Pfam domains
         Sec.struct. author .....ee.............ee. Sec.struct. author
                 SAPs(SNPs) ----------------------- SAPs(SNPs)
                    PROSITE ----------------------- PROSITE
                 Transcript ----------------------- Transcript
                  1cq4 B 61 YRIDRVRLFVDKLDNIAQVPRVG 83
                                    70        80

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Classification and Annotation

SCOP Domains (1, 1)

CATH Domains (1, 1)

Pfam Domains (0, 0)

Gene Ontology (5, 5)

Asymmetric Unit(hide GO term definitions)

Chain A,B (ICI2_HORVU | P01053)

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.
	GO:0009611	response to wounding	Any process that results in a change in state or activity of a cell or an organism (in terms of movement, secretion, enzyme production, gene expression, etc.) as a result of a stimulus indicating damage to the organism.

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