1QMH

Crystal structure of RNA 3'-terminal phosphate cyclase, an ubiquitous enzyme with unusual topology

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	347	37014.2	2	UniProt (P46849) Pfam (PF01137) Pfam (PF05189) In PDB	ESCHERICHIA COLI	RNA CYCLASE, RNA-3'-PHOSPHATE CYCLASE
2	A, B	CITRIC ACID	non-polymer		192.1	2	Chemie (CIT)
3	B	1-HYDROXYSULFANYL-4-MERCAPTO-BUTANE-2,3-DIOL	non-polymer		170.3	1	Chemie (DTO)
4		water	water		18.0	424	Chemie (HOH)

Sequence modifications

A, B: 3 - 339 (UniProt: P46849)

PDB	External Database	Details
Met 1	-	expression tag
Val 2	-	expression tag
Gly 340	-	expression tag
Ser 341	-	expression tag
His 342	-	expression tag
His 343	-	expression tag
His 344	-	expression tag
His 345	-	expression tag
His 346	-	expression tag
His 347	-	expression tag

Contents of the asymmetric unit

Polymers	Number of chains	2
	Total formula weight	74028.5
Non-Polymers*	Number of molecules	3
	Total formula weight	554.5
All*	Total formula weight	74583.0

*Water molecules are not included.