2X4P

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	11879.4	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, H, L, N, P... (A, B, D, E)	GLYCEROL	non-polymer		92.1	6	Chemie (GOL)
5	I, J, K, M, O (B, D, E)	2-(N-MORPHOLINO)-ETHANESULFONIC ACID	non-polymer		195.2	5	Chemie (MES)
6	R, S, T, U, V... (A, B, C, D, E...)	water	water		18.0	434	Chemie (HOH)

Sequence modifications

B, E: 0 - 0 (PDB: 2X4P)
B, E: 1 - 99 (UniProt: P61769)

Contents of the asymmetric unit

Polymers	Number of chains	6
	Total formula weight	89857.6
Non-Polymers*	Number of molecules	11
	Total formula weight	1528.7
All*	Total formula weight	91386.3

*Water molecules are not included.