2HHW

ddTTP:O6-methyl-guanine pair in the polymerase active site, in the closed conformation

Entity

Entity ID	Chain ID	Description	Type	Chain length	Formula weight	Number of molecules	DB Name (Accession)	Biological source	Descriptive keywords
1	E, B	5'-D(*CP*CP*TP*GP*AP*CP*TP*CP*(DDG))-3'	polymer	9	2675.8	2
2	F, C	5'-D(*CP*AP*TP*(6OG)P*CP*GP*AP*GP*TP*CP*AP*GP*G)-3'	polymer	13	4030.7	2
3	A, D	DNA Polymerase I	polymer	580	66144.8	2	UniProt (Q5KWC1) Pfam (PF22619) Pfam (PF00476) In PDB	Geobacillus stearothermophilus
4	G, H	beta-D-fructofuranose-(2-1)-alpha-D-glucopyranose	branched		342.3	2	In PDB BIRD (PRD_900003)		sucrose
5	A, D	MANGANESE (II) ION	non-polymer		54.9	2	Chemie (MN)
6	A, D	SULFATE ION	non-polymer		96.1	3	Chemie (SO4)
7	A, D	2',3'-DIDEOXY-THYMIDINE-5'-TRIPHOSPHATE	non-polymer		466.2	2	Chemie (D3T)
8		water	water		18.0	794	Chemie (HOH)

Contents of the asymmetric unit

Polymers	Number of chains	6
	Total formula weight	145702.5
Branched	Number of molecules	2
	Total formula weight	684.6
Non-Polymers*	Number of molecules	7
	Total formula weight	1330.4
All*	Total formula weight	147717.5

*Water molecules are not included.