1NQH	Transport Protein	date	Jan 21, 2003
title	Outer Membrane Cobalamin Transporter (Btub) From E. Coli, Wi Calcium And Cyanocobalamin (Vitamin B12) Substrate
authors	D.P.Chimento, A.K.Mohanty, R.J.Kadner, M.C.Wiener
compound		source
Molecule: Vitamin B12 Receptor Chain: A Synonym: Outer Membrane Cobalamin Transporter Engineered: Yes		Organism_scientific: Escherichia Coli Organism_taxid: 562 Gene: Btub Expression_system: Escherichia Coli Expression_system_taxid: 562 Expression_system_strain: Bl21(De3)Plyss Expression_system_vector_type: Plasmid Expression_system_plasmid: Pet22b
symmetry	Space Group: P 31 2 1	R_factor 0.224 R_Free 0.265
crystal cell	length a length b length c angle alpha angle beta angle gamma 81.687 81.687 225.814 90.00 90.00 120.00
method	X-Ray Diffraction	resolution	3.10 Å
ligand	C8E, CA, CNC	enzyme
Gene Ontology	Chain Function Process Component A vitamin transmembrane transp...
Primary reference	Substrate-induced transmembrane signaling in the cobalamin transporter BtuB., Chimento DP, Mohanty AK, Kadner RJ, Wiener MC, Nat Struct Biol 2003 May;10(5):394-401. PMID:12652322

Data retrieval

Asymmetric unit, PDB entry: [header only] [complete with coordinates] (107 Kb) [Save to disk] Biological Unit Coordinates (1nqh.pdb1.gz) 97 Kb LPC: Ligand-Protein Contacts for 1NQH CSU: Contacts of Structural Units for 1NQH Likely Quarternary Molecular Structure file(s) for 1NQH Structure Factors (222 Kb) Retrieve 1NQH in mmCIF format [Save to disk] SEQRES to COORDINATES correlation for 1NQH from S2C, [Save to disk] Re-refined 1nqh structure from PDB_REDO, a databank with updated and optimised macromolecular X-ray diffraction structure models

View 1NQH 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 1NQH

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 1NQH, from MSDmotif at EBI Classification of representative domains in scop (Structural Classification of Proteins)     - Domain d1nqha_, region A [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: [1nqh_A] [1nqh] SWISS-PROT database: [P06129] Belongs to the outer membrane receptor (omr) family according to TCDB. Domain organization of [BTUB_ECOLI] by SWISSPFAM

Other resources with information on 1NQH

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

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