1NQI Transferase Activator Transferase date Jan 21, 2003
title Crystal Structure Of Lactose Synthase, A 1:1 Complex Between Galactosyltransferase And Alpha-Lactalbumin In The Presence
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 La Synthase Complex;
 Organism_scientific: Mus Musculus
Organism_common: House Mouse
Organism_taxid: 10090
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,
Galactosyltransferase 1; Udp-Galactose: Beta-N-Acetylglucosa 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 La Synthase Complex
Organism_scientific: Bos Taurus
Organism_common: Cattle
Organism_taxid: 9913
Expression_system: Escherichia Coli Bl21
Expression_system_taxid: 511693
Expression_system_strain: Bl21
Expression_system_vector_type: Plasmid
Expression_system_plasmid: Pet23c
symmetry Space Group: P 1 21 1
R_factor 0.210 R_Free 0.258
crystal
cell
length a length b length c angle alpha angle beta angle gamma
57.161 96.379 99.480 90.00 100.98 90.00
method X-Ray Diffractionresolution 2.00 Å
ligand CA, NAG enzyme Transferase E.C.2.4.1.22 BRENDA
note 1NQI supersedes 1J92
related structures by homologous chain: 1HMK, 1NKH, 1OQM
Gene
Ontology
ChainFunctionProcessComponent
A, C


D, B


Primary referenceCrystal 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] (147 Kb) [Save to disk]
  • Biological Unit Coordinates (1nqi.pdb1.gz) 73 Kb
  • Biological Unit Coordinates (1nqi.pdb2.gz) 72 Kb
  • LPC: Ligand-Protein Contacts for 1NQI
  • CSU: Contacts of Structural Units for 1NQI
  • Likely Quarternary Molecular Structure file(s) for 1NQI
  • Structure Factors (570 Kb)
  • Retrieve 1NQI in mmCIF format [Save to disk]
  • SEQRES to COORDINATES correlation for 1NQI from S2C, [Save to disk]
  • Re-refined 1nqi structure from PDB_REDO, a databank with updated and optimised macromolecular X-ray diffraction structure models
    • View 1NQI 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 1NQI
  • 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 1NQI, from MSDmotif at EBI
  • Classification of representative domains in scop (Structural Classification of Proteins)
        - Domain d1nqia_, region A [Jmol] [rasmolscript] [script source]
        - Domain d1nqib_, region B [Jmol] [rasmolscript] [script source]
        - Domain d1nqic_, region C [Jmol] [rasmolscript] [script source]
        - Domain d1nqid_, 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: [1nqi_C] [1nqi] [1nqi_A] [1nqi_B] [1nqi_D]
  • SWISS-PROT database: [P08037] [P29752]
  • Domain organization of [B4GT1_BOVIN] [LALBA_MOUSE] by SWISSPFAM
  • Domain found in 1NQI: [LYZ1 ] by SMART
    • Other resources with information on 1NQI
  • Community annotation for 1NQI at PDBWiki (http://pdbwiki.org)
  • MMDB (Entrez's Structure Database)
    • Movements, Movies and Images
  • Images from IMB Jena Image Library of Biological Macromolecules.

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