3IX9	Oxidoreductase	date	Sep 03, 2009
title	Crystal Structure Of Streptococcus Pneumoniae Dihydrofolate - Sp9 Mutant
authors	N.H.Yennawar
compound		source
Molecule: Dihydrofolate Reductase Chain: A, B Ec: 1.5.1.3 Engineered: Yes Mutation: Yes		Organism_scientific: Streptococcus Pneumoniae Organism_taxid: 1313 Gene: Dfr Expression_system: Escherichia Coli Expression_system_taxid: 562 Expression_system_strain: Er2566, Dthydfol Expression_system_vector_type: Plasmid Expression_system_plasmid: Pet28a
symmetry	Space Group: P 21 21 2	R_factor 0.237 R_Free 0.274
crystal cell	length a length b length c angle alpha angle beta angle gamma 61.838 93.639 71.367 90.00 90.00 90.00
method	X-Ray Diffraction	resolution	1.95 Å
ligand	MTX, NDP	enzyme	Oxidoreductase E.C.1.5.1.3 BRENDA
Gene Ontology	Chain Function Process Component A, B
Primary reference	Kinetic and structural characterization of dihydrofolate reductase from Streptococcus pneumoniae., Lee J, Yennawar NH, Gam J, Benkovic SJ, Biochemistry. 2010 Jan 12;49(1):195-206. PMID:19950924

Data retrieval

Asymmetric unit, PDB entry: [header only] [complete with coordinates] (70 Kb) [Save to disk] Biological Unit Coordinates (3ix9.pdb1.gz) 64 Kb Biological Unit Coordinates (3ix9.pdb2.gz) 33 Kb Biological Unit Coordinates (3ix9.pdb3.gz) 33 Kb LPC: Ligand-Protein Contacts for 3IX9 CSU: Contacts of Structural Units for 3IX9 Structure Factors (228 Kb) Retrieve 3IX9 in mmCIF format [Save to disk] SEQRES to COORDINATES correlation for 3IX9 from S2C, [Save to disk] Re-refined 3ix9 structure from PDB_REDO, a databank with updated and optimised macromolecular X-ray diffraction structure models

View 3IX9 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 3IX9

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 3IX9, from MSDmotif at EBI

Sequence-derived information

View one-letter amino acid or nucleotide sequence for each chain: [3ix9_A] [3ix9] [3ix9_B] SWISS-PROT database: Domain organization of by SWISSPFAM

Other resources with information on 3IX9

Community annotation for 3IX9 at PDBWiki (http://pdbwiki.org) MMDB (Entrez's Structure Database)

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