1A31	Isomerase Dna	date	Jan 27, 1998
title	Human Reconstituted Dna Topoisomerase I In Covalent Complex With A 22 Base Pair Dna Duplex
authors	M.R.Redinbo, L.Stewart, P.Kuhn, J.J.Champoux, W.G.J.Hol
compound		source
Molecule: Dna (5'- D(Apapapapapgpapcp5iup5iutpgpapapapapap5i Up5iup5iup5iupt)-3'); Chain: C Engineered: Yes		Synthetic: Yes
Molecule: Dna (5'- D(Apapapapaptp5iup5iup5iup5iupcpapapapgptp Cptptptptpt)-3'); Chain: D Engineered: Yes		Synthetic: Yes
Molecule: Protein (Topoisomerase I) Chain: A Fragment: Core Domain And C-Terminal Domain Ec: 5.99.1.2 Engineered: Yes		Organism_scientific: Homo Sapiens Organism_common: Human Organism_taxid: 9606 Cellular_location: Nucleus Expression_system: Spodoptera Frugiperda Expression_system_common: Fall Armyworm Expression_system_taxid: 7108 Expression_system_vector: Baculovirus
symmetry	Space Group: P 1 21 1	R_factor 0.247 R_Free 0.310
crystal cell	length a length b length c angle alpha angle beta angle gamma 72.000 66.600 71.800 90.00 98.30 90.00
method	X-Ray Diffraction	resolution	2.10 Å
ligand	5IU, PTR	enzyme	Isomerase E.C.5.99.1.2 BRENDA
note	1A31 (Molecule of the Month:pdb73)
related structures	by homologous chain: 1K4T, 1RRJ
Gene Ontology	Chain Function Process Component A
Primary reference	Crystal structures of human topoisomerase I in covalent and noncovalent complexes with DNA., Redinbo MR, Stewart L, Kuhn P, Champoux JJ, Hol WG, Science 1998 Mar 6;279(5356):1504-13. PMID:9488644

Data retrieval

Asymmetric unit, PDB entry: [header only] [complete with coordinates] (108 Kb) [Save to disk] Biological Unit Coordinates (1a31.pdb1.gz) 102 Kb LPC: Ligand-Protein Contacts for 1A31 CSU: Contacts of Structural Units for 1A31 Likely Quarternary Molecular Structure file(s) for 1A31 Retrieve 1A31 in mmCIF format [Save to disk] SEQRES to COORDINATES correlation for 1A31 from S2C, [Save to disk]

View 1A31 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 1A31

Ramachandran plot from PDBSum

Structure-derived information

Dipole moment, from Dipole Server at Weizmann Institute 3D motif for 1A31, from MSDmotif at EBI Classification of representative domains in scop (Structural Classification of Proteins)     - Domain d1a31a2, region A:215-430 [Jmol] [rasmolscript] [script source]     - Domain d1a31a1, region A:431-626,A:720-765 [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: [1a31_C] [1a31] [1a31_A] [1a31_D] SWISS-PROT database: [P11387] Domain organization of [TOP1_HUMAN] by SWISSPFAM Domain found in 1A31: [TOPEUc ] by SMART

Other resources with information on 1A31

Community annotation for 1A31 at PDBWiki (http://pdbwiki.org) MMDB (Entrez's Structure Database)

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