1K9O	Hydrolase Hydrolase Inhibitor	date	Oct 29, 2001
title	Crystal Structure Of Michaelis Serpin-Trypsin Complex
authors	S.Ye, A.L.Cech, R.Belmares, R.C.Bergstrom, Y.Tong, D.R.Corey, M.R. E.J.Goldsmith
compound		source
Molecule: Alaserpin Chain: I Synonym: Serpin 1 Engineered: Yes Mutation: Yes		Organism_scientific: Manduca Sexta Organism_common: Tobacco Hornworm Organism_taxid: 7130 Expression_system: Escherichia Coli Expression_system_taxid: 562 Expression_system_strain: Xl1-Blue Expression_system_vector_type: Plasmid Expression_system_plasmid: H6pqe-60
Molecule: Trypsin II Anionic Chain: E Synonym: Pretrypsinogen II Ec: 3.4.21.4 Engineered: Yes Mutation: Yes		Organism_scientific: Rattus Norvegicus Organism_common: Norway Rat Organism_taxid: 10116 Expression_system: Saccharomyces Cerevisiae Expression_system_common: Baker'S Yeast Expression_system_taxid: 4932 Expression_system_vector_type: Plasmid Expression_system_plasmid: Pyt
symmetry	Space Group: P 31 2 1	R_factor 0.158 R_Free 0.231
crystal cell	length a length b length c angle alpha angle beta angle gamma 112.572 112.572 95.955 90.00 90.00 120.00
method	X-Ray Diffraction	resolution	2.30 Å
ligand		enzyme	Hydrolase E.C.3.4.21.4 BRENDA
note	1K9O (Molecule of the Month:pdb53)supersedes 1I99
related structures	by homologous chain: 1D6R, 1SEK, 1TRM
Gene Ontology	Chain Function Process Component E I
Primary reference	The structure of a Michaelis serpin-protease complex., Ye S, Cech AL, Belmares R, Bergstrom RC, Tong Y, Corey DR, Kanost MR, Goldsmith EJ, Nat Struct Biol. 2001 Nov;8(11):979-83. PMID:11685246

Data retrieval

Asymmetric unit, PDB entry: [header only] [complete with coordinates] (101 Kb) [Save to disk] Biological Unit Coordinates (1k9o.pdb1.gz) 96 Kb CSU: Contacts of Structural Units for 1K9O Likely Quarternary Molecular Structure file(s) for 1K9O Structure Factors (242 Kb) Retrieve 1K9O in mmCIF format [Save to disk] SEQRES to COORDINATES correlation for 1K9O from S2C, [Save to disk] Re-refined 1k9o structure from PDB_REDO, a databank with updated and optimised macromolecular X-ray diffraction structure models

View 1K9O 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.

Visual 3D analysis of 1K9O

Ramachandran plot from PDBSum

Structure-derived information

Dipole moment, from Dipole Server at Weizmann Institute 3D motif for 1K9O, from MSDmotif at EBI Classification of representative domains in scop (Structural Classification of Proteins)     - Domain d1k9oe_, region E [Jmol] [rasmolscript] [script source]     - Domain d1k9oi_, region I [Jmol] [rasmolscript] [script source] 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: [1k9o] [1k9o_E] [1k9o_I] SWISS-PROT database: [P14754] [P00763] Domain organization of [SERA_MANSE] [TRY2_RAT] by SWISSPFAM Domains found in 1K9O: [SERPIN] [Tryp_SPc ] by SMART

Other resources with information on 1K9O

Community annotation for 1K9O at PDBWiki (http://pdbwiki.org) MMDB (Entrez's Structure Database)

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