1KLU: HLA-DR1/TPI(23-37)

Crystal structure of HLA-DR1/TPI(23-37) complexed with staphylococcal enterotoxin C3 variant 3B2 (SEC3-3B2). Determined by X-ray diffraction at 1.93 Å resolution. Released 2 Aug 2002.

Method: X-ray diffraction
Resolution: 1.93 Å
Organisms: Homo sapiens, Staphylococcus aureus
Chains: 4
Atoms: 5,415
Mol. weight: 72.06 kDa
Released: 2 Aug 2002

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

Secondary structure: helices and β-sheets

1KLU contains 22 α-helices and 51 β-strands across 4 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	52-53	2	2
α-helix	57-76	20
α-helix	80-84	5
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	138-139	2	4
β-strand	145-153	9	4
β-strand	160-166	7	5
β-strand	174-179	6	5

Chain B: 7 helices, 15 β-strands

Element	Residues	Length	Sheet
β-strand	7-18	12	1
β-strand	23-31	9	1
β-strand	36-41	6	1
β-strand	47-49	3	1
α-helix	52-54	3
α-helix	55-62	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
α-helix	96-97	2
β-strand	98-103	6	7
β-strand	113-122	10	7
β-strand	123	1	6
β-strand	128-133	6	8
β-strand	136-137	2	8
β-strand	142-144	3	7
β-strand	148-149	2	7
β-strand	155-163	9	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	24-25	2	2
α-helix	26-27	2
α-helix	29-36	8

Chain D: 9 helices, 19 β-strands

Element	Residues	Length	Sheet
α-helix	2-7	6
α-helix	8-10	3
α-helix	14-16	3
β-strand	17	1	9
α-helix	22-28	7
β-strand	33-38	6	10
β-strand	42	1	11
β-strand	48-52	5	11
β-strand	63-67	5	11
α-helix	71-78	8
β-strand	82-86	5	10
β-strand	89	1	11
β-strand	108-112	5	11
β-strand	115-117	3	10
β-strand	122	1	12
β-strand	129-137	9	13
β-strand	140-149	10	13
β-strand	151	1	12
β-strand	153-155	3	14
α-helix	156-171	16
β-strand	183-189	7	13
β-strand	195-199	5	13
α-helix	202-203	2
β-strand	205	1	9
α-helix	210-214	5
α-helix	215-219	5
β-strand	222-224	3	14
β-strand	229-235	7	13

Molecules and chains

Molecule	Chains	Type	Length	Organism	UniProt
HLA class II histocompatibility antigen, dr alpha chain	A	protein	179	Homo sapiens	P01903 (AlphaFold model)
HLA class II histocompatibility antigen, dr-1 beta chain	B	protein	190	Homo sapiens	P01911 (AlphaFold model)
Triosephosphate isomerase peptide	C	protein	15		P60174 (AlphaFold model)
Enterotoxin type C-3	D	protein	239	Staphylococcus aureus	P0A0L5 (AlphaFold model)

Sequence of entity 1 (A), FASTA

>1KLU_1 HLA CLASS II HISTOCOMPATIBILITY ANTIGEN, DR ALPHA CHAIN (chains A)
EHVIIQAEFYLNPDQSGEFMFDFDGDEIFHVDMAKKETVWRLEEFGRFASFEAQGALANI
AVDKANLEIMTKRSNYTPITNVPPEVTVLTNSPVELREPNVLICFIDKFTPPVVNVTWLR
NGKPVTTGVSETVFLPREDHLFRKFHYLPFLPSTEDVYDCRVEHWGLDEPLLKHWEFDA

Sequence of entity 2 (B), FASTA

>1KLU_2 HLA CLASS II HISTOCOMPATIBILITY ANTIGEN, DR-1 BETA CHAIN (chains B)
GDTRPRFLWQLKFECHFFNGTERVRLLERCIYNQEESVRFDSDVGEYRAVTELGRPDAEY
WNSQKDLLEQRRAAVDTYCRHNYGVGESFTVQRRVEPKVTVYPSKTQPLQHHNLLVCSVS
GFYPGSIEVRWFRNGQEEKAGVVSTGLIQNGDWTFQTLVMLETVPRSGEVYTCQVEHPSV
TSPLTVEWRA

Sequence of entity 3 (C), FASTA

>1KLU_3 Triosephosphate isomerase peptide (chains C)
GELIGTLNAAKVPAD

Sequence of entity 4 (D), FASTA

>1KLU_4 ENTEROTOXIN TYPE C-3 (chains D)
ESQPDPMPDDLHKSSEFTGTMGNMKYLYDDHYVSATKVKSVDSFFKWDLIYNISDKKLKN
YDKVKTELLNEDLAKKYKDEVVDVYGSNYYVNCYFSSKDNVGKVTGGKTCMYGGITKHEG
NHFDNGNLQNVLVRVYENKRNTISFEVQTDKKSVTAQELDIKARNFLINKKNLYEFNSSP
YETGYIKFIENNGNTFWYDMMPAPGDKFDQSKYLMMYNDNKTVDSKSVKIEVHLTTKNG

Primary citation

Minor structural changes in a mutated human melanoma antigen correspond to dramatically enhanced stimulation of a CD4+ tumor-infiltrating lymphocyte line. Sundberg, E.J., Sawicki, M.W., Southwood, S. et al. J Mol Biol (2002) 319:449-461. DOI 10.1016/S0022-2836(02)00370-4 · 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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