3I2A

Crystal structure of a chimeric trypsin inhibitor protein STI(L)-WCI(S)

Entity

Entity ID	Chain ID	Description	Type	Chain length	Formula weight	Number of molecules	DB Name (Accession)	Biological source	Descriptive keywords
1	A, B (A, B)	Chymotrypsin inhibitor 3	polymer	187	20779.5	2	UniProt (P10822) Pfam (PF00197)	Psophocarpus tetragonolobus (Goa bean)	WCI-3
2	C, D (A, B)	CHLORIDE ION	non-polymer		35.5	2	Chemie (CL)
3	E, F (A, B)	water	water		18.0	161	Chemie (HOH)

Sequence modifications

A, B: 4 - 186 (UniProt: P10822)

PDB	External Database	Details
Gly 0	-	expression tag
Ser 1	-	expression tag
His 2	-	expression tag
Met 3	-	expression tag
Pro 66	Gln 87	engineered mutation
Tyr 67	Phe 88	engineered mutation
Arg 68	Leu 89	engineered mutation
Ile 69	Ser 90	engineered mutation
Arg 70	Leu 91	engineered mutation

Contents of the asymmetric unit

Polymers	Number of chains	2
	Total formula weight	41558.9
Non-Polymers*	Number of molecules	2
	Total formula weight	70.9
All*	Total formula weight	41629.8

*Water molecules are not included.