1R5I

Crystal structure of the MAM-MHC complex

Entity

Entity ID	Chain ID	Description	Type	Chain length	Formula weight	Number of molecules	DB Name (Accession)	Biological source	Descriptive keywords
1	A, E	HLA class II histocompatibility antigen, DR alpha chain	polymer	181	21225.5	2	UniProt (P01903) Pfam (PF00993) Pfam (PF07654) In PDB	Homo sapiens (human)	MHC class II antigen DRA
2	B, F	HLA class II histocompatibility antigen, DRB1-1 beta chain	polymer	190	22080.7	2	UniProt (P04229) Pfam (PF00969) Pfam (PF07654) UniProt (by SIFTS) (P01911) In PDB	Homo sapiens (human)	MHC class I antigen DRB1*1, DR-1, DR1
3	C, G	Hemagglutinin peptide	polymer	13	1506.8	2	UniProt (P11133) In PDB
4	D, H	superantigen	polymer	216	25589.6	2	UniProt (Q48898) Pfam (PF09245) In PDB	Mycoplasma arthritidis	Mycoplasma arthritidis-derived mitogen
5	C, D, E, H	PHOSPHATE ION	non-polymer		95.0	4	Chemie (PO4)
6		water	water		18.0	106	Chemie (HOH)

Sequence modifications

A, E: 1 - 181 (UniProt: P01903)

PDB	External Database	Details
Mse 23	Met 48	modified residue
Mse 36	Met 61	modified residue
Mse 73	Met 98	modified residue

D, H: 1 - 213 (UniProt: Q48898)

PDB	External Database	Details
Leu -2	-	cloning artifact
Gly -1	-	cloning artifact
Ser 0	-	cloning artifact

Contents of the asymmetric unit

Polymers	Number of chains	8
	Total formula weight	140805.2
Non-Polymers*	Number of molecules	4
	Total formula weight	379.9
All*	Total formula weight	141185.1

*Water molecules are not included.