1RXK

crystal structure of streptavidin mutant (M3) a combination of M1+M2

Entity

Entity ID	Chain ID	Description	Type	Chain length	Formula weight	Number of molecules	DB Name (Accession)	Biological source	Descriptive keywords
1	A, B	Streptavidin	polymer	125	13325.5	2	UniProt (P22629) Pfam (PF01382) In PDB	Streptomyces avidinii
2	A, B	5-(2-OXO-HEXAHYDRO-THIENO[3,4-D]IMIDAZOL-6-YL)-PENTANOIC ACID (4-NITRO-PHENYL)-AMIDE	non-polymer		364.4	2	Chemie (BNI)
3		water	water		18.0	153	Chemie (HOH)

Sequence modifications

A, B: 14 - 135 (UniProt: P22629)

PDB	External Database	Details
Thr 48	72	SEE REMARK 999
Ala 49	73	SEE REMARK 999
Thr 50	74	SEE REMARK 999
Ser 50	Gly 75	SEE REMARK 999
Asn 50	Asn 76	SEE REMARK 999
Glu 50	Ala 77	SEE REMARK 999
Ile 51	Glu 78	SEE REMARK 999
Lys 52	Ser 79	SEE REMARK 999
Arg 124	Leu 148	engineered mutation

Contents of the asymmetric unit

Polymers	Number of chains	2
	Total formula weight	26651.0
Non-Polymers*	Number of molecules	2
	Total formula weight	728.8
All*	Total formula weight	27379.8

*Water molecules are not included.