1KU2

Crystal Structure of Thermus aquaticus RNA Polymerase Sigma Subunit Fragment Containing Regions 1.2 to 3.1

Entity

Entity ID	Chain ID	Description	Type	Chain length	Formula weight	Number of molecules	DB Name (Accession)	Biological source	Descriptive keywords
1	A, B (A, B)	sigma factor sigA	polymer	241	27614.9	2	UniProt (Q9EZJ8) Pfam (PF00140) Pfam (PF04542) Pfam (PF04539)	Thermus aquaticus
2	C, D (A)	SULFATE ION	non-polymer		96.1	2	Chemie (SO4)

Contents of the asymmetric unit

Polymers	Number of chains	2
	Total formula weight	55229.8
Non-Polymers*	Number of molecules	2
	Total formula weight	192.1
All*	Total formula weight	55421.9

*Water molecules are not included.