8PXG

Structure of Streptactin, solved at wavelength 2.75 A

Entity

Entity ID	Chain ID	Description	Type	Chain length	Formula weight	Number of molecules	DB Name (Accession)	Biological source	Descriptive keywords
1	A	Streptavidin	polymer	127	13346.4	1	UniProt (P22629) Pfam (PF01382) In PDB	Streptomyces avidinii
2	A	CHLORIDE ION	non-polymer		35.5	7	Chemie (CL)
3	A	GLYCEROL	non-polymer		92.1	1	Chemie (GOL)
4		water	water		18.0	69	Chemie (HOH)

Sequence modifications

A: 2 - 127 (UniProt: P22629)

PDB	External Database	Details
Met 1	-	initiating methionine
Val 32	Glu 68	engineered mutation
Thr 33	Ser 69	engineered mutation
Arg 35	Val 71	engineered mutation
Glu 105	Ala 141	engineered mutation
Gly 108	Trp 144	engineered mutation
Tyr 109	Lys 145	engineered mutation

Contents of the asymmetric unit

Polymers	Number of chains	1
	Total formula weight	13346.4
Non-Polymers*	Number of molecules	8
	Total formula weight	340.3
All*	Total formula weight	13686.7

*Water molecules are not included.