1QBA	Glycosyl Hydrolase	date	Jun 06, 1996
title	Bacterial Chitobiase, Glycosyl Hydrolase Family 20
authors	I.Tews, A.Perrakis, A.Oppenheim, Z.Dauter, K.S.Wilson, C.E.Vorgias
compound		source
Molecule: Chitobiase Chain: A Synonym: Beta-N-Acetylhexosaminidase, N-Acetyl-Beta-D- Glucosaminidase; Ec: 3.2.1.52 Engineered: Yes		Organism_scientific: Serratia Marcescens Organism_taxid: 615 Expression_system: Escherichia Coli Expression_system_taxid: 562 Expression_system_strain: A5484 Expression_system_cellular_location: Periplasm Expression_system_vector_type: Bacterial Expression_system_plasmid: Pembl18 Other_details: Periplasmatic Targeting Sequence Residues 1- 27 Cleaved Off During Maturation
symmetry	Space Group: P 21 21 2	R_factor 0.139 R_Free 0.196
crystal cell	length a length b length c angle alpha angle beta angle gamma 110.700 99.900 87.700 90.00 90.00 90.00
method	X-Ray Diffraction	resolution	1.85 Å
ligand	SO4	enzyme	Hydrolase E.C.3.2.1.52 BRENDA
related structures	by homologous chain: 1C7S, 1C7T
Gene Ontology	Chain Function Process Component A
Primary reference	Bacterial chitobiase structure provides insight into catalytic mechanism and the basis of Tay-Sachs disease., Tews I, Perrakis A, Oppenheim A, Dauter Z, Wilson KS, Vorgias CE, Nat Struct Biol 1996 Jul;3(7):638-48. PMID:8673609

Data retrieval

Asymmetric unit, PDB entry: [header only] [complete with coordinates] (277 Kb) [Save to disk] Biological Unit Coordinates (1qba.pdb1.gz) 273 Kb LPC: Ligand-Protein Contacts for 1QBA CSU: Contacts of Structural Units for 1QBA Likely Quarternary Molecular Structure file(s) for 1QBA Structure Factors (1344 Kb) Retrieve 1QBA in mmCIF format [Save to disk] SEQRES to COORDINATES correlation for 1QBA from S2C, [Save to disk] Re-refined 1qba structure from PDB_REDO, a databank with updated and optimised macromolecular X-ray diffraction structure models

View 1QBA in 3D

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Visual 3D analysis of 1QBA

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 1QBA, from MSDmotif at EBI Genome occurence of 1QBA's fold from GeneCensus Classification of representative domains in scop (Structural Classification of Proteins)     - Domain d1qba_4, region 201-337 [Jmol] [rasmolscript] [script source]     - Domain d1qba_2, region 28-200 [Jmol] [rasmolscript] [script source]     - Domain d1qba_3, region 338-780 [Jmol] [rasmolscript] [script source]     - Domain d1qba_1, region 781-885 [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: [1qba] [1qba_A] SWISS-PROT database: [Q54468] Domain organization of [CHB_SERMA] by SWISSPFAM Domain found in 1QBA: [CHB_HEX ] by SMART

Other resources with information on 1QBA

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

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