4PXG

Crystal Structure of TypeII restriction Enzyme Sau3AI

Entity

Entity ID	Chain ID	Description	Type	Chain length	Formula weight	Number of molecules	DB Name (Accession)	Biological source	Descriptive keywords
1	A, B	Type-2 restriction enzyme Sau3AI	polymer	509	59089.1	2	UniProt (P16667) Pfam (PF02976) In PDB	Staphylococcus aureus	R.Sau3AI, Endonuclease Sau3AI, Type II restriction enzyme Sau3AI
2	A	CALCIUM ION	non-polymer		40.1	1	Chemie (CA)
3		water	water		18.0	31	Chemie (HOH)

Sequence modifications

A, B: 1 - 489 (UniProt: P16667)

PDB	External Database	Details
Mse -19	-	EXPRESSION TAG
Gly -18	-	EXPRESSION TAG
Ser -17	-	EXPRESSION TAG
Ser -16	-	EXPRESSION TAG
His -15	-	EXPRESSION TAG
His -14	-	EXPRESSION TAG
His -13	-	EXPRESSION TAG
His -12	-	EXPRESSION TAG
His -11	-	EXPRESSION TAG
His -10	-	EXPRESSION TAG
Ser -9	-	EXPRESSION TAG
Ser -8	-	EXPRESSION TAG
Gly -7	-	EXPRESSION TAG
Leu -6	-	EXPRESSION TAG
Val -5	-	EXPRESSION TAG
Pro -4	-	EXPRESSION TAG
Arg -3	-	EXPRESSION TAG
Gly -2	-	EXPRESSION TAG
Ser -1	-	EXPRESSION TAG
His 0	-	EXPRESSION TAG
Ala 64	Glu 64	ENGINEERED MUTATION

Contents of the asymmetric unit

Polymers	Number of chains	2
	Total formula weight	118178.2
Non-Polymers*	Number of molecules	1
	Total formula weight	40.1
All*	Total formula weight	118218.2

*Water molecules are not included.