1TM1

CRYSTAL STRUCTURE OF THE COMPLEX OF SUBTILISIN BPN' WITH CHYMOTRYPSIN INHIBITOR 2

Entity

Entity ID	Chain ID	Description	Type	Chain length	Formula weight	Number of molecules	DB Name (Accession)	Biological source	Descriptive keywords
1	E	Subtilisin BPN' precursor	polymer	281	28381.4	1	UniProt (P00782) Pfam (PF00082) In PDB	Bacillus amyloliquefaciens	Subtilisin Novo, Alkaline protease
2	I	chymotrypsin inhibitor 2	polymer	64	7283.6	1	GenBank (19005) Pfam (PF00280) UniProt (by SIFTS) (Q40059) In PDB	Hordeum vulgare subsp. vulgare (domesticated barley)
3	E	CALCIUM ION	non-polymer		40.1	1	Chemie (CA)
4	E	SODIUM ION	non-polymer		23.0	1	Chemie (NA)
5	E	CITRIC ACID	non-polymer		192.1	3	Chemie (CIT)
6	E	PENTAETHYLENE GLYCOL	non-polymer		238.3	4	Chemie (1PE)
7		water	water		18.0	511	Chemie (HOH)

Sequence modifications

E: 1 - 275 (UniProt: P00782)

PDB	External Database	Details
His 276	-	expression tag
His 277	-	expression tag
His 278	-	expression tag
His 279	-	expression tag
His 280	-	expression tag
His 281	-	expression tag

I: 21 - 83 (GenBank: 19005)

PDB	External Database	Details
Met 20	-	initiating methionine

Contents of the asymmetric unit

Polymers	Number of chains	2
	Total formula weight	35665.0
Non-Polymers*	Number of molecules	9
	Total formula weight	1592.6
All*	Total formula weight	37257.5

*Water molecules are not included.