2X4Q

Crystal structure of MHC CLass I HLA-A2.1 bound to a photocleavable peptide

Entity

Entity ID	Chain ID	Description	Type	Chain length	Formula weight	Number of molecules	DB Name (Accession)	Biological source	Descriptive keywords
1	A, D (A, D)	HLA CLASS I HISTOCOMPATIBILITY ANTIGEN, A-2.1	polymer	275	31854.2	2	UniProt (P01892) Pfam (PF00129) Pfam (PF07654) UniProt (by SIFTS) (P04439)	HOMO SAPIENS (HUMAN)	HLA CLASS I HISTOCOMPATIBILITY ANTIGEN, A-2 ALPHA CHAIN
2	B, E (B, E)	BETA-2-MICROGLOBULIN	polymer	100	11973.1	2	UniProt (P61769) Pfam (PF07654)	HOMO SAPIENS (HUMAN)	BETA-2-MICROGLOBULIN FORM PI 5.3
3	C, F (C, F)	HLA-A2.1-RESTRICTED INFLUENZA A MATRIX EPITOPE	polymer	9	1195.2	2		INFLUENZA A VIRUS
4	G, I, J (B, D, E)	2-(N-MORPHOLINO)-ETHANESULFONIC ACID	non-polymer		195.2	3	Chemie (MES)
5	H (B)	GLYCEROL	non-polymer		92.1	1	Chemie (GOL)
6	K, L, M, N, O... (A, B, C, D, E...)	water	water		18.0	312	Chemie (HOH)

Sequence modifications

B, E: 0 - 0 (PDB: 2X4Q)
B, E: 1 - 99 (UniProt: P61769)

Contents of the asymmetric unit

Polymers	Number of chains	6
	Total formula weight	90045.1
Non-Polymers*	Number of molecules	4
	Total formula weight	677.8
All*	Total formula weight	90723.0

*Water molecules are not included.