4H26: PDB entry 4H26

TCR interaction with peptide mimics of nickel offers structure insight to nickel contact allergy. Determined by X-ray diffraction at 2.5 Å resolution. Released 16 Oct 2013.

Method: X-ray diffraction
Resolution: 2.5 Å
Organism: Homo sapiens
Chains: 6
Atoms: 6,478
Mol. weight: 89.26 kDa
Released: 16 Oct 2013

Explore 4H26 in 3D Show helices and sheets RCSB PDB PDBe

Secondary structure: helices and β-sheets

4H26 contains 24 α-helices and 64 β-strands across 6 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: 4 helices, 16 β-strands

Element	Residues	Length	Sheet
β-strand	5-15	11	1
β-strand	19-26	8	1
β-strand	29-35	7	1
β-strand	40-43	4	1
α-helix	48-51	4
β-strand	53	1	2
α-helix	57-75	19
α-helix	80-82	3
β-strand	85	1	3
α-helix	86-87	2
β-strand	88-93	6	4
β-strand	103-112	10	4
β-strand	113	1	3
β-strand	118-123	6	5
β-strand	126-128	3	5
β-strand	133-134	2	4
β-strand	138	1	4
β-strand	145-153	9	4
β-strand	160-166	7	5
β-strand	174-179	6	5

Chain B: 5 helices, 15 β-strands

Element	Residues	Length	Sheet
β-strand	7-18	12	1
β-strand	23-32	10	1
β-strand	35-41	7	1
β-strand	47-49	3	1
α-helix	54-61	8
α-helix	65-74	10
α-helix	75-80	6
α-helix	81-86	6
α-helix	87-89	3
β-strand	95	1	6
β-strand	98-104	7	7
β-strand	114-122	9	7
β-strand	123	1	6
β-strand	128-133	6	8
β-strand	136-138	3	8
β-strand	142-144	3	7
β-strand	148-149	2	7
β-strand	155-162	8	7
β-strand	170-176	7	8
β-strand	184-189	6	8

Chain C: 2 helices, 1 β-strand

Element	Residues	Length	Sheet
β-strand	307	1	2
α-helix	308-310	3
α-helix	312-315	4

Chain D: 5 helices, 16 β-strands

Element	Residues	Length	Sheet
β-strand	5-15	11	9
β-strand	19-26	8	9
β-strand	29-35	7	9
β-strand	40-43	4	9
α-helix	46-51	6
β-strand	53	1	10
α-helix	57-76	20
α-helix	80-84	5
β-strand	85	1	11
α-helix	86-87	2
β-strand	88-93	6	12
β-strand	103-112	10	12
β-strand	113	1	11
β-strand	118-123	6	13
β-strand	126-127	2	13
β-strand	133-134	2	12
α-helix	137	1
β-strand	138-139	2	12
β-strand	145-153	9	12
β-strand	160-166	7	13
β-strand	174-179	6	13

Chain E: 7 helices, 15 β-strands

Element	Residues	Length	Sheet
β-strand	7-18	12	9
β-strand	23-32	10	9
β-strand	36-41	6	9
β-strand	47-49	3	9
α-helix	54-62	9
α-helix	65-72	8
α-helix	74	1
α-helix	75-80	6
α-helix	81-86	6
α-helix	87-89	3
β-strand	95	1	14
α-helix	96-97	2
β-strand	98-104	7	15
β-strand	114-122	9	15
β-strand	123	1	14
β-strand	128-133	6	16
β-strand	136-138	3	16
β-strand	142-144	3	15
β-strand	148-149	2	15
β-strand	155-162	8	15
β-strand	170-176	7	16
β-strand	184-189	6	16

Chain F: 1 helix, 1 β-strand

Element	Residues	Length	Sheet
β-strand	307	1	10
α-helix	308-311	4

Molecules and chains

Molecule	Chains	Type	Length	Organism	UniProt
HLA class II histocompatibility antigen, DR alpha chain	A, D	protein	179	Homo sapiens	P01903 (AlphaFold model)
MHC class II antigen	B, E	protein	188	Homo sapiens	B8YAC7 (AlphaFold model)
peptide	C, F	protein	11

Sequence of entity 1 (A, D), FASTA

>4H26_1 HLA class II histocompatibility antigen, DR alpha chain (chains A, D)
EEHVIIQAEFYLNPDQSGEFMFDFDGDEIFHVDMAKKETVWRLEEFGRFASFEAQGALAN
IAVDKANLEIMTKRSNYTPITNVPPEVTVLTNSPVELREPNVLICFIDKFTPPVVNVTWL
RNGKPVTTGVSETVFLPREDHLFRKFHYLPFLPSTEDVYDCRVEHWGLDEPLLKHWEFD

Sequence of entity 2 (B, E), FASTA

>4H26_2 MHC class II antigen (chains B, E)
TRPRFLELLKSECHFFNGTERVRFLERYFHNQEEFVRFDSDVGEYRAVTELGRPVAESWN
SQKDLLEQKRGQVDTYCRHNYGVVESFTVQRRVHPQVTVYPAKTQPLQHHNLLVCSVSGF
YPGSIEVRWFRNGQEEKTGVVSTGLIHNGDWTFQTLVMLETVPRSGEVYTCQVEHPSVTS
PLTVEWRA

Sequence of entity 3 (C, F), FASTA

>4H26_3 peptide (chains C, F)
QWIRVNIPKRI

Primary citation

T-cell receptor (TCR) interaction with peptides that mimic nickel offers insight into nickel contact allergy. Yin, L., Crawford, F., Marrack, P. et al. Proc Natl Acad Sci U S A (2012) 109:18517-18522. DOI 10.1073/pnas.1215928109 · PubMed

Other PDB entries of the same protein (UniProt P01903 (AlphaFold model), which also has an AlphaFold model), best resolution first:

5NI9 1.33 Å, Crystal structure of HLA-DRB1*04:01 with the alpha-enolase peptide 326-340
4X5W 1.34 Å, HLA-DR1 with CLIP102-120(M107W)
5NIG 1.35 Å, Crystal structure of HLA-DRB1*04:01 with modified alpha-enolase peptide 326-340…
8CMC 1.42 Å, Human Leukocyte Antigen class II allotype DR1 presenting SARS-CoV-2 Spike peptide S511-530
8PJF 1.48 Å, Human Leukocyte Antigen class II allotype DR1 presenting P11T->R modified influenza A…
6QZC 1.64 Å, HLA-DR1 with the QAR Peptide
8CMG 1.64 Å, Human Leukocyte Antigen class II allotype DR1 presenting SARS-CoV-2 nsp14 peptide…
8CMH 1.64 Å, Human Leukocyte Antigen class II allotype DR1 presenting SARS-CoV-2 Omicron (BA.1) Spike…
4MD5 1.65 Å, Immune Receptor
4MDJ 1.7 Å, Immune Receptor
8PJE 1.7 Å, Human Leukocyte Antigen class II allotype DR1 presenting influenza A virus…
7YX9 1.76 Å, MHC-II dynamics are maintained in HLA-DR allotypes to ensure catalyzed peptide exchange

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