8XXX: CXCR2

Structure of CXCR2 bound to CXCL6 (Composite map). Determined by electron microscopy at 3.17 Å resolution. Released 15 Jan 2025.

Method: Electron microscopy
Resolution: 3.17 Å
Organisms: Homo sapiens, Mus musculus
Chains: 6
Atoms: 9,083
Mol. weight: 154.92 kDa
Released: 15 Jan 2025

Explore 8XXX in 3D Show helices and sheets RCSB PDB PDBe

Secondary structure: helices and β-sheets

8XXX contains 35 α-helices and 65 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: 7 helices, 7 β-strands

Element	Residues	Length	Sheet
α-helix	7-29	23
β-strand	33-40	8	3
β-strand	186-188	3	3
β-strand	191-192	2	3
β-strand	195-201	7	3
α-helix	209-211	3
α-helix	213-216	4
β-strand	221-227	7	3
α-helix	246-255	10
β-strand	265-270	6	3
α-helix	272-281	10
α-helix	297-309	13
β-strand	319-323	5	3
α-helix	331-351	21

Chain B: 4 helices, 28 β-strands

Element	Residues	Length	Sheet
α-helix	6-25	20
α-helix	30-33	4
α-helix	38-39	2
β-strand	47-51	5	4
β-strand	58-63	6	5
β-strand	69-74	6	5
β-strand	78-83	6	5
β-strand	88-94	7	5
α-helix	95	1
β-strand	100-105	6	6
β-strand	111-116	6	6
β-strand	121-125	5	6
β-strand	134-139	6	6
β-strand	146-153	8	7
β-strand	156-161	6	7
β-strand	165-170	6	7
β-strand	176-181	6	7
β-strand	187-192	6	8
β-strand	198-203	6	8
β-strand	207-212	6	8
β-strand	218-223	6	8
β-strand	229-234	6	9
β-strand	240-245	6	9
β-strand	250-254	5	9
β-strand	260-263	4	9
β-strand	273-277	5	10
β-strand	284-289	6	10
β-strand	294-298	5	10
β-strand	304-307	4	10
β-strand	315-320	6	4
β-strand	327-331	5	4
β-strand	336-339	4	4

Chain D: 2 helices, 3 β-strands

Element	Residues	Length	Sheet
α-helix	23-25	3
β-strand	26-32	7	1
β-strand	42-47	6	1
β-strand	52-55	4	1
α-helix	60-68	9

Chain G: 4 helices, 0 β-strands

Element	Residues	Length
α-helix	13-23	11
α-helix	30-43	14
α-helix	54-55	2
α-helix	56-58	3

Chain R: 13 helices, 2 β-strands

Element	Residues	Length	Sheet
α-helix	45-75	31
α-helix	82-110	29
α-helix	116-148	33
α-helix	154-160	7
α-helix	162-182	21
β-strand	185-187	3	2
β-strand	195-197	3	2
α-helix	204-211	8
α-helix	213-216	4
α-helix	217-221	5
α-helix	222-239	18
α-helix	246-278	33
α-helix	286-304	19
α-helix	306-314	9
α-helix	319-328	10

Chain S: 5 helices, 25 β-strands

Element	Residues	Length	Sheet
β-strand	3-7	5	11
β-strand	11-12	2	12
β-strand	18-25	8	11
α-helix	29-31	3
β-strand	33-40	8	13
β-strand	44-51	8	13
α-helix	53-55	3
β-strand	58-60	3	13
β-strand	68-73	6	11
β-strand	78-83	6	11
β-strand	92-99	8	13
β-strand	111	1	13
β-strand	115-117	3	13
β-strand	118-119	2	12
α-helix	125-127	3
β-strand	128-130	3	14
β-strand	134-136	3	15
β-strand	143-149	7	14
β-strand	154	1	16
β-strand	160	1	16
β-strand	162-167	6	15
β-strand	174-177	4	15
β-strand	183	1	15
β-strand	191-196	6	14
β-strand	199-204	6	14
α-helix	209-211	3
β-strand	214-219	6	15
α-helix	225	1
β-strand	226-227	2	15
β-strand	231-234	4	15

Molecules and chains

Molecule	Chains	Type	Length	Organism	UniProt
C-X-C motif chemokine 6	D	protein	77	Homo sapiens	P80162 (AlphaFold model)
C-X-C chemokine receptor type 2	R	protein	416	Homo sapiens	P25025 (AlphaFold model)
Guanine nucleotide-binding protein G(o) subunit alpha	A	protein	240	Homo sapiens	P09471 (AlphaFold model)
Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1	B	protein	350	Homo sapiens	P62873 (AlphaFold model)
Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2	G	protein	71	Homo sapiens	P59768
Antibody fragment ScFv16	S	protein	248	Mus musculus

Sequence of entity 1 (D), FASTA

>8XXX_1 C-X-C motif chemokine 6 (chains D)
GPVSAVLTELRCTCLRVTLRVNPKTIGKLQVFPAGPQCSKVEVVASLKNGKQVCLDPEAP
FLKKVIQKILDSGNKKN

Sequence of entity 2 (R), FASTA

>8XXX_2 C-X-C chemokine receptor type 2 (chains R)
MGKTIIALSYIFCLVFADYKDDDDAANFTPVNGSSGNQSVRLVTSSSLEVLFQGPGSEDF
NMESDSFEDFWKGEDLSNYSYSSTLPPFLLDAAPCEPESLEINKYFVVIIYALVFLLSLL
GNSLVMLVILYSRVGRSVTDVYLLNLALADLLFALTLPIWAASKVNGWIFGTFLCKVVSL
LKEVNFYSGILLLACISVDRYLAIVHATRTLTQKRYLVKFICLSIWGLSLLLALPVLLFR
RTVYSSNVSPACYEDMGNNTANWRMLLRILPQSFGFIVPLLIMLFCYGFTLRTLFKAHMG
QKHRAMRVIFAVVLIFLLCWLPYNLVLLADTLMRTQVIQETCERRNHIDRALDATEILGI
LHSCLNPLIYAFIGQKFRHGLLKILAIHGLISKDSLPKDSRPSFVGSSSGHTSTTL

Sequence of entity 3 (A), FASTA

>8XXX_3 Guanine nucleotide-binding protein G(o) subunit alpha (chains A)
MGHHHHHHENLYFQGTLSAEERAALERSKAIEKNLKEDGISAAKDVKLLLLGADNSGKST
IVKQMKIIHGGSGGSGGTTGIVETHFTFKNLHFRLFDVGGQRSERKKWIHCFEDVTAIIF
CVDLSDYNRMHESLMLFDSICNNKFFIDTSIILFLNKKDLFGEKIKKSPLTICFPEYTGP
NTYEDAAAYIQAQFESKNRSPNKEIYCHMTCATDTNNAQVIFDAVTDIIIANNLRGCGLY

Sequence of entity 4 (B), FASTA

>8XXX_4 Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1 (chains B)
MHHHHHHGSSGSELDQLRQEAEQLKNQIRDARKACADATLSQITNNIDPVGRIQMRTRRT
LRGHLAKIYAMHWGTDSRLLVSASQDGKLIIWDSYTTNKVHAIPLRSSWVMTCAYAPSGN
YVACGGLDNICSIYNLKTREGNVRVSRELAGHTGYLSCCRFLDDNQIVTSSGDTTCALWD
IETGQQTTTFTGHTGDVMSLSLAPDTRLFVSGACDASAKLWDVREGMCRQTFTGHESDIN
AICFFPNGNAFATGSDDATCRLFDLRADQELMTYSHDNIICGITSVSFSKSGRLLLAGYD
DFNCNVWDALKADRAGVLAGHDNRVSCLGVTDDGMAVATGSWDSFLKIWN

Sequence of entity 5 (G), FASTA

>8XXX_5 Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2 (chains G)
MASNNTASIAQARKLVEQLKMEANIDRIKVSKAAADLMAYCEAHAKEDPLLTPVPASENP
FREKKFFCAIL

Sequence of entity 6 (S), FASTA

>8XXX_6 Antibody fragment ScFv16 (chains S)
DVQLVESGGGLVQPGGSRKLSCSASGFAFSSFGMHWVRQAPEKGLEWVAYISSGSGTIYY
ADTVKGRFTISRDDPKNTLFLQMTSLRSEDTAMYYCVRSIYYYGSSPFDFWGQGTTLTVS
SGGGGSGGGGSGGGGSDIVMTQATSSVPVTPGESVSISCRSSKSLLHSNGNTYLYWFLQR
PGQSPQLLIYRMSNLASGVPDRFSGSGSGTAFTLTISRLEAEDVGVYYCMQHLEYPLTFG
AGTKLELK

Primary citation

Molecular basis of promiscuous chemokine binding and structural mimicry at the C-X-C chemokine receptor, CXCR2. Saha, S., Sano, F.K., Sharma, S. et al. Mol Cell (2025) 85:976-988.e9. DOI 10.1016/j.molcel.2025.01.024 · PubMed

Other PDB entries of the same protein (UniProt P80162 (AlphaFold model), which also has an AlphaFold model), best resolution first:

8XWM 3.71 Å, Structure of CXCR2 bound to CXCL6 (Ligand-receptor focused map)

Browse structure collections

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