1K4S	Isomerase Dna	date	Oct 08, 2001
title	Human Dna Topoisomerase I In Covalent Complex With A 22 Base Pair Dna Duplex
authors	B.L.Staker, K.Hjerrild, M.D.Feese, C.A.Behnke, A.B.Burgin Jr., L.J.Stewart
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)P(5iu)Pt)-3'; Chain: C Engineered: Yes		Synthetic: Yes
Molecule: 5'-D(Apapapapaptp(Ido)Up(Ido)Up(Ido) Up(Ido)Upcpapapapgp(Ido)Upcp(Ido)Up(Ido)Up(Ido) Up(Ido)Upt)-3'; Chain: D Engineered: Yes		Synthetic: Yes
Molecule: Dna Topoisomerase I Chain: A Fragment: Core Domain And C-Terminal Domain, Residues 174- 765; 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] (107 Kb) [Save to disk] Biological Unit Coordinates (1k4s.pdb1.gz) 98 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

Cartoon representation from PDB Cartoon Ramachandran plot from PDBSum

Structure-derived information

Dipole moment, from Dipole Server at Weizmann Institute Crystal Contacts, from CryCo 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] Fold representative 1k4s from FSSP and Dali (Families of Structurally Similar Proteins)

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)

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