1G7Q: MHC class I H-2KB heavy chain

Crystal structure of MHC class I H-2KB heavy chain complexed with beta-2 microglobulin and MUC1 vntr peptide sapdtrpa. Determined by X-ray diffraction at 1.6 Å resolution. Released 17 Jul 2002.

Method: X-ray diffraction
Resolution: 1.6 Å
Organism: Mus musculus
Chains: 3
Atoms: 3,397
Mol. weight: 44.96 kDa
Ligands: NAG
Released: 17 Jul 2002

Explore 1G7Q in 3D Show helices and sheets RCSB PDB PDBe

Secondary structure: helices and β-sheets

1G7Q contains 11 α-helices and 29 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: 9 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	138-150	13
α-helix	152-158	7
α-helix	159-164	6
α-helix	165-174	10
α-helix	176-179	4
β-strand	183	1	2
β-strand	186-194	9	3
β-strand	198-208	11	3
β-strand	209	1	2
β-strand	214-219	6	4
β-strand	222-223	2	4
β-strand	229-230	2	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	270-272	3	4

Chain B: 1 helix, 10 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	50-56	7	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
H-2 class I histocompatibility antigen, K-B alpha chain	A	protein	274	Mus musculus	P01901 (AlphaFold model)
Beta-2 microglobulin	B	protein	99	Mus musculus	P01887 (AlphaFold model)
Mucin 1, transmembrane	P	protein	8

Sequence of entity 1 (A), FASTA

>1G7Q_1 H-2 CLASS I HISTOCOMPATIBILITY ANTIGEN, K-B ALPHA CHAIN (chains A)
GPHSLRYFVTAVSRPGLGEPRYMEVGYVDDTEFVRFDSDAENPRYEPRARWMEQEGPEYW
ERETQKAKGNEQSFRVDLRTLLGYYNQSKGGSHTIQVISGCEVGSDGRLLRGYQQYAYDG
CDYIALNEDLKTWTAADMAALITKHKWEQAGEAERLRAYLEGTCVEWLRRYLKNGNATLL
RTDSPKAHVTHHSRPEDKVTLRCWALGFYPADITLTWQLNGEELIQDMELVETRPAGDGT
FQKWASVVVPLGKEQYYTCHVYHQGLPEPLTLRW

Sequence of entity 2 (B), FASTA

>1G7Q_2 BETA-2 MICROGLOBULIN (chains B)
IQKTPQIQVYSRHPPENGKPNILNCYVTQFHPPHIEIQMLKNGKKIPKVEMSDMSFSKDW
SFYILAHTEFTPTETDTYACRVKHDSMAEPKTVYWDRDM

Sequence of entity 3 (P), FASTA

>1G7Q_3 MUCIN 1, TRANSMEMBRANE (chains P)
SAPDTRPA

Ligands and cofactors

ID	Name	Formula	Copies
NAG	2-acetamido-2-deoxy-beta-D-glucopyranose	C8 H15 N O6	1

Primary citation

Crystal structure of a non-canonical low-affinity peptide complexed with MHC class I: a new approach for vaccine design. Apostolopoulos, V., Yu, M., Corper, A.L. et al. J Mol Biol (2002) 318:1293-1305. DOI 10.1016/S0022-2836(02)00196-1 · PubMed

Other PDB entries of the same protein (UniProt P01901 (AlphaFold model), which also has an AlphaFold model), best resolution first:

1LK2 1.35 Å, 1.35A crystal structure of H-2Kb complexed with the GNYSFYAL peptide
1G7P 1.5 Å, Crystal structure of MHC class I H-2KB heavy chain complexed with beta-2 microglobulin…
1KPU 1.5 Å, High resolution crystal structure of the MHC class I complex H-2Kb/VSV8
3TID 1.65 Å, Crystal structure of the LCMV derived peptide GP34 in complex with the murine mhc class…
1FZK 1.7 Å, MHC class I natural mutant H-2KBM1 heavy chain complexed with beta-2 microglobulin and…
1KPV 1.71 Å, High resolution crystal structure of the MHC class I complex H-2Kb/SEV9
1LEG 1.75 Å, Crystal Structure of H-2Kb bound to the dEV8 peptide
6GB6 1.78 Å, Structure of H-2Kb with dipeptide GL
1FZM 1.8 Å, MHC class I natural mutant H-2KBM8 heavy chain complexed with beta-2 microglobulin and…
1FZO 1.8 Å, MHC class I natural mutant H-2KBM8 heavy chain complexed with beta-2 microglobulin and…
1T0N 1.8 Å, Conformational switch in polymorphic H-2K molecules containing an HSV peptide
2QRT 1.8 Å, Crystal Structure of a disulfide trapped single chain trimer composed of the MHC I heavy…

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