1NKH	Transferase Activator Transferase	date	Jan 03, 2003
title	Crystal Structure Of Lactose Synthase Complex With Udp And Manganese
authors	B.Ramakrishnan, P.K.Qasba
compound		source
Molecule: Alpha-Lactalbumin Chain: A, C Fragment: Regulatory Subunit Of Lactose Synthase Synonym: Lactalbumin, Alpha Engineered: Yes Other_details: Chains A And B Form First, C And D Second Lactose Synthase Complex;		Organism_scientific: Mus Musculus Organism_common: House Mouse Organism_taxid: 10090 Gene: Alpha-Lactalbumin Expression_system: Escherichia Coli Bl21 Expression_system_taxid: 511693 Expression_system_strain: Bl21 Expression_system_vector_type: Plasmid Expression_system_plasmid: Pet17.1
Molecule: Beta-1,4-Galactosyltransferase Chain: B, D Fragment: Catalytic Domain, Residues 130-402 Synonym: B4gal-T1; Beta4gal-T1; Beta-1,4-Galtase 1; Beta-1, 4-Galactosyltransferase 1; Udp-Galactose: Beta-N- Acetylglucosamine Beta-1,4-Galactosyltransferase 1; Ec: 2.4.1.22, 2.4.1.90, 2.4.1.38 Engineered: Yes Other_details: Chains A And B Form First, C And D Second Lactose Synthase Complex		Organism_scientific: Bos Taurus Organism_common: Cattle Organism_taxid: 9913 Gene: Beta1,4-Galactosyltransferase Expression_system: Escherichia Coli Bl21 Expression_system_taxid: 511693 Expression_system_strain: Bl21 Expression_system_vector_type: Plasmid Expression_system_plasmid: Pet23c Other_details: N-Terminal Carries A Tag Containing 13 Amino Acids
symmetry	Space Group: P 1 21 1	R_factor 0.196 R_Free 0.251
crystal cell	length a length b length c angle alpha angle beta angle gamma 55.469 99.145 102.261 90.00 104.14 90.00
method	X-Ray Diffraction	resolution	2.00 Å
ligand	CA, MN, PG4, SO4, UDP	enzyme	Transferase E.C.2.4.1.22 BRENDA
note	1NKH supersedes 1J8X
related structures	by homologous chain: 1FKV, 1HMK, 1NF5, 1NQI
Gene Ontology	Chain Function Process Component A, C D, B
Primary reference	Crystal structure of lactose synthase reveals a large conformational change in its catalytic component, the beta1,4-galactosyltransferase-I., Ramakrishnan B, Qasba PK, J Mol Biol. 2001 Jun 29;310(1):205-18. PMID:11419947

Data retrieval

Asymmetric unit, PDB entry: [header only] [complete with coordinates] (153 Kb) [Save to disk] Biological Unit Coordinates (1nkh.pdb1.gz) 75 Kb Biological Unit Coordinates (1nkh.pdb2.gz) 75 Kb LPC: Ligand-Protein Contacts for 1NKH CSU: Contacts of Structural Units for 1NKH Likely Quarternary Molecular Structure file(s) for 1NKH Structure Factors (474 Kb) Retrieve 1NKH in mmCIF format [Save to disk] SEQRES to COORDINATES correlation for 1NKH from S2C, [Save to disk] Re-refined 1nkh structure from PDB_REDO, a databank with updated and optimised macromolecular X-ray diffraction structure models

View 1NKH 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 1NKH

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 1NKH, from MSDmotif at EBI Classification of representative domains in scop (Structural Classification of Proteins)     - Domain d1nkha_, region A [Jmol] [rasmolscript] [script source]     - Domain d1nkhb_, region B [Jmol] [rasmolscript] [script source]     - Domain d1nkhc_, region C [Jmol] [rasmolscript] [script source]     - Domain d1nkhd_, region D [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: [1nkh_C] [1nkh_B] [1nkh] [1nkh_D] [1nkh_A] SWISS-PROT database: [P08037] [P29752] Domain organization of [B4GT1_BOVIN] [LALBA_MOUSE] by SWISSPFAM Domain found in 1NKH: [LYZ1 ] by SMART

Other resources with information on 1NKH

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

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