1TWX	Hydrolase Hydrolase Inhibitor	date	Jul 01, 2004
title	Crystal Structure Of The Thrombin Mutant D221ad222k
authors	A.O.Pineda, E.Zhang, E.R.Guinto, S.N.Savvides, A.Tulinsky, E.Di C
compound		source
Molecule: Prothrombin Chain: A Fragment: Light Chain Synonym: Coagulation Factor II Ec: 3.4.21.5 Engineered: Yes		Organism_scientific: Homo Sapiens Organism_common: Human Organism_taxid: 9606 Gene: F2 Expression_system: Cricetulus Griseus Expression_system_common: Chinese Hamster Expression_system_taxid: 10029 Expression_system_cell: Kidney Expression_system_vector_type: Plasmid Expression_system_plasmid: Hpc4-Pnut
Molecule: Prothrombin Chain: B Fragment: Heavy Chain Synonym: Coagulation Factor II Ec: 3.4.21.5 Engineered: Yes Mutation: Yes		Organism_scientific: Homo Sapiens Organism_common: Human Organism_taxid: 9606 Gene: F2 Expression_system: Cricetulus Griseus Expression_system_common: Chinese Hamster Expression_system_taxid: 10029 Expression_system_cell: Kidney Expression_system_vector_type: Plasmid Expression_system_plasmid: Hpc4-Pnut
Molecule: Hirudin Chain: C Engineered: Yes		Synthetic: Yes
symmetry	Space Group: C 2 2 21	R_factor 0.205 R_Free 0.268
crystal cell	length a length b length c angle alpha angle beta angle gamma 92.150 80.010 100.600 90.00 90.00 90.00
method	X-Ray Diffraction	resolution	2.40 Å
ligand	NAG, TYS	enzyme	Hydrolase E.C.3.4.21.5 BRENDA
related structures	by homologous chain: 1NRS, 1TQ7
Gene Ontology	Chain Function Process Component A B
Primary reference	Crystal structure of the thrombin mutant D221A/D222K: the Asp222:Arg187 ion-pair stabilizes the fast form., Pineda AO, Zhang E, Guinto ER, Savvides SN, Tulinsky A, Di Cera E, Biophys Chem 2004 Dec 20;112(2-3):253-6. PMID:15572256

Data retrieval

Asymmetric unit, PDB entry: [header only] [complete with coordinates] (56 Kb) [Save to disk] Biological Unit Coordinates (1twx.pdb1.gz) 50 Kb LPC: Ligand-Protein Contacts for 1TWX CSU: Contacts of Structural Units for 1TWX Likely Quarternary Molecular Structure file(s) for 1TWX Structure Factors (141 Kb) Retrieve 1TWX in mmCIF format [Save to disk] SEQRES to COORDINATES correlation for 1TWX from S2C, [Save to disk] Re-refined 1twx structure from PDB_REDO, a databank with updated and optimised macromolecular X-ray diffraction structure models

View 1TWX 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 1TWX

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 3D motif for 1TWX, from MSDmotif at EBI

Sequence-derived information

View one-letter amino acid or nucleotide sequence for each chain: [1twx_A] [1twx] [1twx_B] [1twx_C] SWISS-PROT database: [P00734] Domain organization of [THRB_HUMAN] by SWISSPFAM Domain found in 1TWX: [Tryp_SPc ] by SMART

Other resources with information on 1TWX

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

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