4GD9

Circular Permuted Streptavidin N49/G48

Entity

Entity ID	Chain ID	Description	Type	Chain length	Formula weight	Number of molecules	DB Name (Accession)	Biological source	Descriptive keywords
1	A, B, C, D	Streptavidin	polymer	132	13670.8	4	UniProt (P22629) In PDB	Streptomyces avidinii
2	A, B, C, D	BIOTIN	non-polymer		244.3	4	Chemie (BTN)
3	C, D	SULFATE ION	non-polymer		96.1	2	Chemie (SO4)
4		water	water		18.0	366	Chemie (HOH)

Sequence modifications

A, B, C, D: 49 - 139 (UniProt: P22629)

PDB	External Database	Details
Met 48	-	expression tag

A, B, C, D: 213 - 248 (UniProt: P22629)

PDB	External Database	Details
Gly 140	-	linker
Gly 141	-	linker
Gly 142	-	linker
Ser 143	-	linker

Contents of the asymmetric unit

Polymers	Number of chains	4
	Total formula weight	54683.1
Non-Polymers*	Number of molecules	6
	Total formula weight	1169.4
All*	Total formula weight	55852.5

*Water molecules are not included.