1RXJ

Crystal structure of streptavidin mutant (M2) where the L3,4 loop was replace by that of avidin

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	121	12881.0	4	UniProt (P22629) Pfam (PF01382) In PDB	Streptomyces avidinii
2	A, B, C, D	5-(2-OXO-HEXAHYDRO-THIENO[3,4-D]IMIDAZOL-6-YL)-PENTANOIC ACID (4-NITRO-PHENYL)-AMIDE	non-polymer		364.4	4	Chemie (BNI)
3		water	water		18.0	598	Chemie (HOH)

Sequence modifications

A, B, C, D: 15 - 135 (UniProt: P22629)

PDB	External Database	Details
Ser 48	72	SEE REMARK 999
Ala 46	73	SEE REMARK 999
Thr 47	74	SEE REMARK 999
Ser 48	Gly 75	SEE REMARK 999
Asn 49	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

Contents of the asymmetric unit

Polymers	Number of chains	4
	Total formula weight	51524.1
Non-Polymers*	Number of molecules	4
	Total formula weight	1457.7
All*	Total formula weight	52981.7

*Water molecules are not included.