1C9V

H12A VARIANT OF RIBONUCLEASE A

Entity

Entity ID	Chain ID	Description	Type	Chain length	Formula weight	Number of molecules	DB Name (Accession)	Biological source	Descriptive keywords
1	A	RIBONUCLEASE A	polymer	124	13641.3	1	UniProt (P61823) Pfam (PF00074) In PDB	Bos taurus (cattle)
2	A	CHLORIDE ION	non-polymer		35.5	2	Chemie (CL)
3		water	water		18.0	98	Chemie (HOH)

Sequence modifications

A: 1 - 124 (UniProt: P61823)

PDB	External Database	Details
Ala 12	His 38	engineered mutation

Contents of the asymmetric unit

Polymers	Number of chains	1
	Total formula weight	13641.3
Non-Polymers*	Number of molecules	2
	Total formula weight	70.9
All*	Total formula weight	13712.2

*Water molecules are not included.