2P4A

X-ray structure of a camelid affinity matured single-domain vhh antibody fragment in complex with RNASE A

Entity

Entity ID	Chain ID	Description	Type	Chain length	Formula weight	Number of molecules	DB Name (Accession)	Biological source	Descriptive keywords
1	A, C	Ribonuclease pancreatic	polymer	124	13708.3	2	UniProt (P61823) Pfam (PF00074) In PDB	Bos taurus (cattle)	RNase 1, RNase A
2	B, D	ANTIBODY CAB-RN05	polymer	121	12830.3	2	Pfam (PF07686) UniProt (by SIFTS) (A2KD57) In PDB	Camelus dromedarius (Arabian camel)
3	A, C	SULFATE ION	non-polymer		96.1	2	Chemie (SO4)
4		water	water		18.0	361	Chemie (HOH)

Contents of the asymmetric unit

Polymers	Number of chains	4
	Total formula weight	53077.2
Non-Polymers*	Number of molecules	2
	Total formula weight	192.1
All*	Total formula weight	53269.3

*Water molecules are not included.