2X4S

Crystal structure of MHC CLass I HLA-A2.1 bound to a peptide representing the epitope of the H5N1 (Avian Flu) Nucleoprotein

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)	MHC CLASS I ANTIGEN A*2
2	B, E (B, E)	BETA-2-MICROGLOBULIN	polymer	100	11973.1	2	UniProt (P61769) Pfam (PF07654)	HOMO SAPIENS (HUMAN)
3	C, F (C, F)	H5N1 INFLUENZA A NUCLEOPROTEIN	polymer	9	993.1	2	UniProt (by SIFTS) (Q33CG5)	INFLUENZA VIRUS TYPE A
4	G (B)	GLYCEROL	non-polymer		92.1	1	Chemie (GOL)
5	H, I (B, E)	2-(N-MORPHOLINO)-ETHANESULFONIC ACID	non-polymer		195.2	2	Chemie (MES)
6	J, K, L, M (A, B, D, E)	water	water		18.0	140	Chemie (HOH)

Sequence modifications

B, E: 0 - 0 (PDB: 2X4S)
B, E: 1 - 99 (UniProt: P61769)

Contents of the asymmetric unit

Polymers	Number of chains	6
	Total formula weight	89640.9
Non-Polymers*	Number of molecules	3
	Total formula weight	482.6
All*	Total formula weight	90123.4

*Water molecules are not included.