1CA0	Complex (Serine Protease Inhibitor)	date	Jan 23, 1997
title	Bovine Chymotrypsin Complexed To Appi
authors	A.J.Scheidig, A.A.Kossiakoff
compound		source
Molecule: Bovine Chymotrypsin Chain: A, F Ec: 3.4.21.1		Organism_scientific: Bos Taurus Organism_common: Cattle Organism_taxid: 9913
Molecule: Bovine Chymotrypsin Chain: B, G Ec: 3.4.21.1 Engineered: Yes		Organism_scientific: Bos Taurus Organism_common: Cattle Organism_taxid: 9913 Organ: Pancreatic Gene: A4 Expression_system: Escherichia Coli Expression_system_taxid: 562 Expression_system_strain: 27c7 Expression_system_plasmid: Pa4g32r Expression_system_gene: A4
Molecule: Bovine Chymotrypsin Chain: C, H Ec: 3.4.21.1 Engineered: Yes		Organism_scientific: Bos Taurus Organism_common: Cattle Organism_taxid: 9913 Organ: Pancreatic Gene: A4 Expression_system: Escherichia Coli Expression_system_taxid: 562 Expression_system_strain: 27c7 Expression_system_plasmid: Pa4g32r Expression_system_gene: A4
Molecule: Protease Inhibitor Domain Of Alzheimer'S Amyloid Beta-Protein Precursor; Chain: D, I Synonym: Appi Engineered: Yes		Organism_scientific: Homo Sapiens Organism_common: Human Organism_taxid: 9606 Organ: Pancreatic Gene: A4 Expression_system: Escherichia Coli Expression_system_taxid: 562 Expression_system_strain: 27c7 Expression_system_plasmid: Pa4g32r Expression_system_gene: A4
symmetry	Space Group: P 21 21 2	R_factor 0.215 R_Free 0.323
crystal cell	length a length b length c angle alpha angle beta angle gamma 70.522 181.488 46.328 90.00 90.00 90.00
method	X-Ray Diffraction	resolution	2.10 Å
ligand		enzyme	Hydrolase E.C.3.4.21.1 BRENDA
related structures	by homologous chain: 1BRC, 1DLK, 1TAW, 4VGC
Gene Ontology	Chain Function Process Component H, F, A, C, G, B catalytic activity serine-type endopeptidase ac... peptidase activity serine-type peptidase activi... hydrolase activity proteolysis digestion extracellular region extracellular space
Primary reference	Crystal structures of bovine chymotrypsin and trypsin complexed to the inhibitor domain of Alzheimer's amyloid beta-protein precursor (APPI) and basic pancreatic trypsin inhibitor (BPTI): engineering of inhibitors with altered specificities., Scheidig AJ, Hynes TR, Pelletier LA, Wells JA, Kossiakoff AA, Protein Sci 1997 Sep;6(9):1806-24. PMID:9300481

Data retrieval

Asymmetric unit, PDB entry: [header only] [complete with coordinates] (98 Kb) [Save to disk] Biological Unit Coordinates (1ca0.pdb1.gz) 49 Kb Biological Unit Coordinates (1ca0.pdb2.gz) 48 Kb CSU: Contacts of Structural Units for 1CA0 Likely Quarternary Molecular Structure file(s) for 1CA0 Structure Factors (278 Kb) Retrieve 1CA0 in mmCIF format [Save to disk] SEQRES to COORDINATES correlation for 1CA0 from S2C, [Save to disk] Re-refined 1ca0 structure from PDB_REDO, a databank with updated and optimised macromolecular X-ray diffraction structure models

View 1CA0 in 3D

Proteopedia, because life has more than 2D. On Jmol, a nice Rasmol like molecule viewer. This is good for easiest viewing of basic structure. On FirstGlance, an excellent tool for a guided tour on the structure components, by E. Martz. On AstexViewer, from MSD-EBI (viewer documentation). On RasMol (Install RasMol freeware) Here's help on how to use RasMol.

Visual 3D analysis of 1CA0

Cartoon representation from PDB Cartoon Ramachandran plot from PDBSum

Structure-derived information

Electron Density related parameters from EDS Electron Density Server, at Upsala Dipole moment, from Dipole Server at Weizmann Institute Crystal Contacts, from CryCo at Weizmann Institute 3D motif for 1CA0, from MSDmotif at EBI Genome occurence of 1CA0's fold from GeneCensus Classification of representative domains in scop (Structural Classification of Proteins)     - Domain d1ca0.1, region A:,B:,C [Jmol] [rasmolscript] [script source]     - Domain d1ca0d_, region D [Jmol] [rasmolscript] [script source]     - Domain d1ca0.2, region F:,G:,H [Jmol] [rasmolscript] [script source]     - Domain d1ca0i_, region I [Jmol] [rasmolscript] [script source] Fold representative 1ca0 from FSSP and Dali (Families of Structurally Similar Proteins) Class (fold), Architecture (subfold), Topology, Homologous superfamily from CATH Summaries and structural analyses of PDB data files from PDBSum Identification of Protein Pockets & Cavities at CASTp

Sequence-derived information

View one-letter amino acid or nucleotide sequence for each chain: [1ca0_A] [1ca0_B] [1ca0_C] [1ca0_D] [1ca0_F] [1ca0_G] [1ca0_H] [1ca0_I] SWISS-PROT database: [P05067] [P00766] Belongs to the amyloid -protein peptide (app) family according to TCDB. Domain organization of [A4_HUMAN] [CTRA_BOVIN] by SWISSPFAM Domains found in 1CA0: [KU] [Tryp_SPc ] by SMART Alignments of the sequence of 1CA0 with the sequences similar proteins can be viewed for 1CA0's classification [A4_HUMAN] [CTRA_BOVIN] at ProtoMap. Click on "Neighbors List", then on the "See Alignments" button below the list. A sequence distance tree ("phylogenetic tree") can be viewed for 1ACL's classification [A4_HUMAN] [CTRA_BOVIN] at ProtoMap. Click on the Cluster number.

Other resources with information on 1CA0

Community annotation for 1CA0 at PDBWiki (http://pdbwiki.org) MMDB (Entrez's Structure Database)

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