4O89

Crystal structure of RtcA, the RNA 3'-terminal phosphate cyclase from Pyrococcus horikoshii.

Entity

Entity ID	Chain ID	Description	Type	Chain length	Formula weight	Number of molecules	DB Name (Accession)	Biological source	Descriptive keywords
1	A, B	RNA 3'-terminal phosphate cyclase	polymer	341	37221.1	2	UniProt (O59198) Pfam (PF01137) Pfam (PF05189) In PDB	Pyrococcus horikoshii	RNA cyclase, RNA-3'-phosphate cyclase
2	A, B	CITRIC ACID	non-polymer		192.1	2	Chemie (CIT)
3		water	water		18.0	546	Chemie (HOH)

Contents of the asymmetric unit

Polymers	Number of chains	2
	Total formula weight	74442.2
Non-Polymers*	Number of molecules	2
	Total formula weight	384.2
All*	Total formula weight	74826.4

*Water molecules are not included.