1K4S	Isomerase Dna	date	Oct 08, 2001
title	Human Dna Topoisomerase I In Covalent Complex With A 22 Base Duplex
authors	B.L.Staker, K.Hjerrild, M.D.Feese, C.A.Behnke, A.B.Burgin Jr., L.
compound		source
Molecule: 5'-D(Apapapapapgpapcp(5iu)P(5iu))-3' Chain: B Engineered: Yes		Synthetic: Yes
Molecule: 5'-D((Spt)Pgpapapapapap(5iu)P(5iu)P(5iu Pt)-3'; Chain: C Engineered: Yes		Synthetic: Yes
Molecule: 5'-D(Apapapapaptp(Ido)Up(Ido)Up(Ido)Up( Upcpapapapgp(Ido)Upcp(Ido)Up(Ido)Up(Ido)Up(Ido)U Chain: D Engineered: Yes		Synthetic: Yes
Molecule: Dna Topoisomerase I Chain: A Fragment: Core Domain And C-Terminal Domain, Residues 174-7 Ec: 5.99.1.2 Engineered: Yes		Organism_scientific: Homo Sapiens Organism_common: Human Organism_taxid: 9606 Expression_system: Spodoptera Frugiperda Expression_system_common: Fall Armyworm Expression_system_taxid: 7108 Expression_system_vector_type: Baculovirus Expression_system_vector: Pfactbac1
symmetry	Space Group: P 32	R_factor 0.217 R_Free 0.222
crystal cell	length a length b length c angle alpha angle beta angle gamma 73.235 73.235 186.632 90.00 90.00 120.00
method	X-Ray Diffraction	resolution	3.20 Å
ligand	5IU, PTR, SPT	enzyme	Isomerase E.C.5.99.1.2 BRENDA
Gene Ontology	Chain Function Process Component A
Primary reference	The mechanism of topoisomerase I poisoning by a camptothecin analog., Staker BL, Hjerrild K, Feese MD, Behnke CA, Burgin AB Jr, Stewart L, Proc Natl Acad Sci U S A 2002 Nov 26;99(24):15387-92. Epub 2002 Nov 8. PMID:12426403

Data retrieval

Asymmetric unit, PDB entry: [header only] [complete with coordinates] (105 Kb) [Save to disk] Biological Unit Coordinates (1k4s.pdb1.gz) 96 Kb LPC: Ligand-Protein Contacts for 1K4S CSU: Contacts of Structural Units for 1K4S Likely Quarternary Molecular Structure file(s) for 1K4S Retrieve 1K4S in mmCIF format [Save to disk] SEQRES to COORDINATES correlation for 1K4S from S2C, [Save to disk]

View 1K4S 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 1K4S

Ramachandran plot from PDBSum

Structure-derived information

Dipole moment, from Dipole Server at Weizmann Institute 3D motif for 1K4S, from MSDmotif at EBI Classification of representative domains in scop (Structural Classification of Proteins)     - Domain d1k4sa2, region A:201-430 [Jmol] [rasmolscript] [script source]     - Domain d1k4sa1, region A:431-632,A:708-765 [Jmol] [rasmolscript] [script source]

Sequence-derived information

View one-letter amino acid or nucleotide sequence for each chain: [1k4s_D] [1k4s_A] [1k4s_B] [1k4s_C] [1k4s] SWISS-PROT database: [P11387] Domain organization of [TOP1_HUMAN] by SWISSPFAM Domain found in 1K4S: [TOPEUc ] by SMART

Other resources with information on 1K4S

Community annotation for 1K4S 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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