3MRC: MHC class I HLA-A2 molecule

Crystal Structure of MHC class I HLA-A2 molecule complexed with HCMV pp65-495-503 nonapeptide V6C variant. Determined by X-ray diffraction at 1.8 Å resolution. Released 25 May 2011.

Method: X-ray diffraction
Resolution: 1.8 Å
Organisms: Homo sapiens, Human Cytomegalovirus HCMV
Chains: 3
Atoms: 3,459
Mol. weight: 44.81 kDa
Released: 25 May 2011

Explore 3MRC in 3D Show helices and sheets RCSB PDB PDBe

Secondary structure: helices and β-sheets

3MRC contains 13 α-helices and 30 β-strands across 3 chains. Residue ranges use author residue numbering, as in the PDB file, from PDBe. To see them in 3D, choose the Cartoon representation with Secondary structure coloring: helices, sheets and coils get different colors.

Chain A: 10 helices, 19 β-strands

Element	Residues	Length	Sheet
β-strand	3-12	10	1
α-helix	20	1
β-strand	21-28	8	1
β-strand	31-37	7	1
β-strand	46-47	2	1
α-helix	50-54	5
α-helix	57-84	28
β-strand	94-103	10	1
β-strand	109-118	10	1
β-strand	121-126	6	1
β-strand	133-135	3	1
α-helix	138-149	12
α-helix	152-161	10
α-helix	163-174	12
α-helix	176-179	4
β-strand	183	1	2
α-helix	184-185	2
β-strand	186-193	8	3
β-strand	198-208	11	3
β-strand	209	1	2
β-strand	214-219	6	4
β-strand	222-224	3	4
β-strand	228-230	3	3
α-helix	231-233	3
β-strand	234-235	2	3
β-strand	241-250	10	3
α-helix	254-256	3
β-strand	257-262	6	4
β-strand	270-273	4	4

Chain B: 2 helices, 11 β-strands

Element	Residues	Length	Sheet
β-strand	3	1	5
α-helix	4-5	2
β-strand	6-11	6	6
β-strand	21-30	10	6
β-strand	31	1	5
β-strand	36-41	6	7
β-strand	44-45	2	7
β-strand	50-51	2	6
α-helix	52-54	3
β-strand	55-56	2	6
β-strand	62-70	9	6
β-strand	78-83	6	7
β-strand	91-94	4	7

Chain P: 1 helix, 0 β-strands

Element	Residues	Length	Sheet
α-helix	2-4	3

Molecules and chains

Molecule	Chains	Type	Length	Organism	UniProt
HLA class I histocompatibility antigen, A-2 alpha chain	A	protein	276	Homo sapiens	P04439 (AlphaFold model)
Beta-2-microglobulin	B	protein	100	Homo sapiens	P61769 (AlphaFold model)
9-meric peptide from Tegument protein pp65	P	protein	9	Human Cytomegalovirus HCMV	P06725

Sequence of entity 1 (A), FASTA

>3MRC_1 HLA class I histocompatibility antigen, A-2 alpha chain (chains A)
GSHSMRYFFTSVSRPGRGEPRFIAVGYVDDTQFVRFDSDAASQRMEPRAPWIEQEGPEYW
DGETRKVKAHSQTHRVDLGTLRGYYNQSEAGSHTVQRMYGCDVGSDWRFLRGYHQYAYDG
KDYIALKEDLRSWTAADMAAQTTKHKWEAAHVAEQLRAYLEGTCVEWLRRYLENGKETLQ
RTDAPKTHMTHHAVSDHEATLRCWALSFYPAEITLTWQRDGEDQTQDTELVETRPAGDGT
FQKWVAVVVPSGQEQRYTCHVQHEGLPKPLTLRWEP

Sequence of entity 2 (B), FASTA

>3MRC_2 Beta-2-microglobulin (chains B)
MIQRTPKIQVYSRHPAENGKSNFLNCYVSGFHPSDIEVDLLKNGERIEKVEHSDLSFSKD
WSFYLLYYTEFTPTEKDEYACRVNHVTLSQPKIVKWDRDM

Sequence of entity 3 (P), FASTA

>3MRC_3 9-meric peptide from Tegument protein pp65 (chains P)
NLVPMCATV

Primary citation

Analysis of Relationships between Peptide/MHC Structural Features and Naive T Cell Frequency in Humans. Reiser, J.B., Legoux, F., Gras, S. et al. J Immunol (2014) 193:5816-5826. DOI 10.4049/jimmunol.1303084 · PubMed

Other PDB entries of the same protein (UniProt P04439 (AlphaFold model), which also has an AlphaFold model), best resolution first:

3MRE 1.1 Å, Crystal Structure of MHC class I HLA-A2 molecule complexed with EBV bmlf1-280-288…
3D25 1.3 Å, Crystal structure of HA-1 minor histocompatibility antigen bound to human class I MHC…
3MRG 1.3 Å, Crystal Structure of MHC class I HLA-A2 molecule complexed with HCV NS3-1073-1081…
6JOZ 1.35 Å, Crystal structure of BRLF peptide from EBV in complex with HLA-A1101.
5C0G 1.37 Å, HLA-A02 carrying YLGGPDFPTI
5N1Y 1.39 Å, HLA-A02 carrying MVWGPDPLYV
1I4F 1.4 Å, Crystal structure of HLA-A*0201/MAGE-A4-peptide complex
1OGA 1.4 Å, A structural basis for immunodominant human T-cell receptor recognition.
3MRB 1.4 Å, Crystal Structure of MHC class I HLA-A2 molecule complexed with HCMV pp65-495-503…
3MRK 1.4 Å, Crystal Structure of MHC class I HLA-A2 molecule complexed with AFP137 nonapeptide
6J2A 1.4 Å, The structure of HLA-A*3003/NP44
1X7Q 1.45 Å, Crystal structure of HLA-A*1101 with sars nucleocapsid peptide

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