1CYY

CRYSTAL STRUCTURE OF THE 30 KDA FRAGMENT OF E. COLI DNA TOPOISOMERASE I. HEXAGONAL FORM

Functional Information from GO Data

Chain	GOid	namespace	contents
A	0003677	molecular_function	DNA binding
A	0003916	molecular_function	DNA topoisomerase activity
A	0003917	molecular_function	DNA topoisomerase type I (single strand cut, ATP-independent) activity
A	0006265	biological_process	DNA topological change
B	0003677	molecular_function	DNA binding
B	0003916	molecular_function	DNA topoisomerase activity
B	0003917	molecular_function	DNA topoisomerase type I (single strand cut, ATP-independent) activity
B	0006265	biological_process	DNA topological change

Functional Information from PDB Data

site_id	AC1
Number of Residues	3
Details	BINDING SITE FOR RESIDUE ZN A 1001

Chain	Residue
A	HIS365
A	HIS469
B	GLU463

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Functional Information from PROSITE/UniProt

site_id	PS00396
Number of Residues	15
Details	TOPO_IA_1 Topoisomerase (Topo) IA-type active site signature. QrLYEagy.........ITYmRTD

Chain	Residue	Details
A	GLN309-ASP323

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Functional Information from SwissProt/UniProt

site_id	SWS_FT_FI1
Number of Residues	2
Details	ACT_SITE: O-(5'-phospho-DNA)-tyrosine intermediate => ECO:0000255|PROSITE-ProRule:PRU01383, ECO:0000269|PubMed:21482796, ECO:0000269|PubMed:8114910, ECO:0000269|PubMed:9497321

Chain	Residue	Details
A	TYR319
B	TYR319

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site_id	SWS_FT_FI2
Number of Residues	2
Details	SITE: Interaction with DNA

Chain	Residue	Details
A	ARG321
B	ARG321

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Catalytic Information from CSA

site_id	MCSA1
Number of Residues	3
Details	M-CSA 366

Chain	Residue	Details
A	TYR319	activator, covalently attached, hydrogen bond acceptor, nucleofuge, nucleophile, proton acceptor, proton donor
A	ARG321	electrostatic stabiliser
A	HIS365	electrostatic stabiliser, hydrogen bond acceptor, hydrogen bond donor, increase acidity, proton acceptor, proton donor

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site_id	MCSA2
Number of Residues	3
Details	M-CSA 366

Chain	Residue	Details
B	TYR319	activator, covalently attached, hydrogen bond acceptor, nucleofuge, nucleophile, proton acceptor, proton donor
B	ARG321	electrostatic stabiliser
B	HIS365	electrostatic stabiliser, hydrogen bond acceptor, hydrogen bond donor, increase acidity, proton acceptor, proton donor

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