2FTM

Crystal structure of trypsin complexed with the BPTI variant (Tyr35->Gly)

Entity

Entity ID	Chain ID	Description	Type	Chain length	Formula weight	Number of molecules	DB Name (Accession)	Biological source	Descriptive keywords
1	A	Cationic trypsin	polymer	223	23325.3	1	UniProt (P00760) Pfam (PF00089) In PDB	Bos taurus	Beta-trypsin
2	B	Pancreatic trypsin inhibitor	polymer	58	6421.4	1	UniProt (P00974) Pfam (PF00014) In PDB	Bos taurus	Basic protease inhibitor, BPI, BPTI, Aprotinin
3	A	SODIUM ION	non-polymer		23.0	1	Chemie (NA)
4	A, B	SULFATE ION	non-polymer		96.1	9	Chemie (SO4)
5	A, B	CALCIUM ION	non-polymer		40.1	2	Chemie (CA)
6	A	1,2-ETHANEDIOL	non-polymer		62.1	4	Chemie (EDO)
7		water	water		18.0	238	Chemie (HOH)

Sequence modifications

A: 16 - 238 (UniProt: P00760)

PDB	External Database	Details
Ias 115	Asn 117	engineered mutation
Asp 115	Asn 117	microheterogeneity

B: 1 - 58 (UniProt: P00974)

PDB	External Database	Details
Gly 35	Tyr 70	engineered mutation

Contents of the asymmetric unit

Polymers	Number of chains	2
	Total formula weight	29746.7
Non-Polymers*	Number of molecules	16
	Total formula weight	1216.0
All*	Total formula weight	30962.7

*Water molecules are not included.