2CN4

The crystal structure of the secreted dimeric form of the hemophore HasA reveals a domain swapping with an exchanged heme ligand

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)	HEMOPHORE HASA	polymer	173	17767.9	2	UniProt (Q54450) Pfam (PF06438)	SERRATIA MARCESCENS	HEME BINDING PROTEIN HASA, HEME ACQUISITION SYSTEM PROTEIN A
2	C, E (A, B)	PROTOPORPHYRIN IX CONTAINING FE	non-polymer		616.5	2	Chemie (HEM)
3	D, F (A, B)	PHOSPHATE ION	non-polymer		95.0	2	Chemie (PO4)
4	G, H (A, B)	water	water		18.0	149	Chemie (HOH)

Contents of the asymmetric unit

Polymers	Number of chains	2
	Total formula weight	35535.8
Non-Polymers*	Number of molecules	4
	Total formula weight	1422.9
All*	Total formula weight	36958.7

*Water molecules are not included.