2XGL

The X-ray structure of the Escherichia coli colicin M immunity protein demonstrates the presence of a disulphide bridge, which is functionally essential

Entity

Entity ID	Chain ID	Description	Type	Chain length	Formula weight	Number of molecules	DB Name (Accession)	Biological source	Descriptive keywords
1	A, B (A, B)	COLICIN-M IMMUNITY PROTEIN	polymer	103	12294.7	2	UniProt (P18002) Pfam (PF13995)	Escherichia coli	MICROCIN-M IMMUNITY PROTEIN
2	C, D, E, F, G... (A, B)	CADMIUM ION	non-polymer		112.4	7	Chemie (CD)
3	AA, BA, H, L, M... (B, A)	CHLORIDE ION	non-polymer		35.5	11	Chemie (CL)
4	CA, DA, EA, FA, GA... (B, A)	SODIUM ION	non-polymer		23.0	14	Chemie (NA)
5	IA, JA (A, B)	water	water		18.0	15	Chemie (HOH)

Sequence modifications

A, B: 24 - 117 (UniProt: P18002)

PDB	External Database	Details
Met 23	-	expression tag
Arg 118	-	expression tag
Ser 119	-	expression tag
His 120	-	expression tag
His 121	-	expression tag
His 122	-	expression tag
His 123	-	expression tag
His 124	-	expression tag
His 125	-	expression tag

Contents of the asymmetric unit

Polymers	Number of chains	2
	Total formula weight	24589.4
Non-Polymers*	Number of molecules	32
	Total formula weight	1498.7
All*	Total formula weight	26088.1

*Water molecules are not included.