26XH: Maleic Acid bound OXGR1-Gq complex

Cryo-EM structure of Maleic Acid bound OXGR1-Gq complex. Determined by electron microscopy at 2.82 Å resolution. Released 17 Jun 2026.

Method: Electron microscopy
Resolution: 2.82 Å
Organisms: Homo sapiens, Lama glama
Chains: 6
Atoms: 9,915
Mol. weight: 168.07 kDa
Ligands: MAE
Released: 17 Jun 2026

Explore 26XH in 3D Show helices and sheets RCSB PDB PDBe

Secondary structure: helices and β-sheets

26XH contains 40 α-helices and 73 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: 9 helices, 7 β-strands

Element	Residues	Length	Sheet
α-helix	16-39	24
β-strand	40-47	8	1
α-helix	53-59	7
β-strand	207-214	8	1
β-strand	217-224	8	1
α-helix	236-238	3
β-strand	243-249	7	1
α-helix	266-278	13
β-strand	286-292	7	1
α-helix	294-303	10
α-helix	313-317	5
α-helix	326-327	2
α-helix	332-352	21
β-strand	359	1	1
β-strand	362-363	2	1
α-helix	371-390	20

Chain B: 3 helices, 28 β-strands

Element	Residues	Length	Sheet
α-helix	4-25	22
α-helix	30-33	4
α-helix	38-39	2
β-strand	47-51	5	5
β-strand	58-63	6	6
β-strand	69-74	6	6
β-strand	78-83	6	6
β-strand	88-94	7	6
β-strand	100-105	6	7
β-strand	111-116	6	7
β-strand	121-125	5	7
β-strand	134-139	6	7
β-strand	146-151	6	8
β-strand	156-161	6	8
β-strand	166-170	5	8
β-strand	175-180	6	8
β-strand	187-192	6	9
β-strand	198-203	6	9
β-strand	207-212	6	9
β-strand	217-223	7	9
β-strand	229-234	6	10
β-strand	240-245	6	10
β-strand	250-254	5	10
β-strand	259-264	6	10
β-strand	273-278	6	11
β-strand	284-289	6	11
β-strand	294-298	5	11
β-strand	304-308	5	11
β-strand	317-320	4	5
β-strand	327-330	4	5
β-strand	336-339	4	5

Chain G: 5 helices, 0 β-strands

Element	Residues	Length
α-helix	7-23	17
α-helix	27-29	3
α-helix	30-44	15
α-helix	45-47	3
α-helix	53-55	3

Chain N: 3 helices, 11 β-strands

Element	Residues	Length	Sheet
β-strand	3-7	5	2
β-strand	10-12	3	3
β-strand	17-25	9	2
α-helix	29-31	3
β-strand	34-39	6	3
β-strand	45-51	7	3
β-strand	58-60	3	3
α-helix	62-64	3
β-strand	68-73	6	2
β-strand	78-84	7	2
α-helix	88-90	3
β-strand	92-98	7	3
β-strand	118	1	3
β-strand	122-126	5	3

Chain R: 16 helices, 2 β-strands

Element	Residues	Length	Sheet
α-helix	29-30	2
α-helix	31-35	5
α-helix	36-59	24
α-helix	67-94	28
α-helix	103-136	34
α-helix	142-145	4
α-helix	147-165	19
α-helix	166-170	5
β-strand	174-176	3	4
β-strand	181-183	3	4
α-helix	192-202	11
α-helix	203-208	6
α-helix	209-226	18
α-helix	234-269	36
α-helix	274-292	19
α-helix	294-298	5
α-helix	299-304	6
α-helix	307-316	10

Chain S: 4 helices, 25 β-strands

Element	Residues	Length	Sheet
β-strand	3-7	5	12
β-strand	10-12	3	13
β-strand	18-25	8	12
α-helix	29-31	3
β-strand	33-39	7	13
β-strand	45-51	7	13
β-strand	58-60	3	13
β-strand	65	1	12
β-strand	68-73	6	12
β-strand	78-83	6	12
α-helix	88-90	3
β-strand	92-99	8	13
β-strand	111	1	13
β-strand	115-119	5	13
β-strand	140-141	2	14
β-strand	146-148	3	15
β-strand	155-161	7	14
β-strand	166	1	16
β-strand	172	1	16
β-strand	174-179	6	15
β-strand	186-190	5	15
β-strand	194-195	2	15
α-helix	196	1
β-strand	203-207	5	14
β-strand	211-216	6	14
α-helix	221-223	3
β-strand	225-231	7	15
β-strand	239	1	15
β-strand	243-246	4	15

Molecules and chains

Molecule	Chains	Type	Length	Organism	UniProt
G protein subunit q	A	protein	361	Homo sapiens
Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2	G	protein	71	Homo sapiens	P59768 (AlphaFold model)
Nanobody35	N	protein	138	Lama glama
2-oxoglutarate receptor 1	R	protein	337	Homo sapiens	Q96P68 (AlphaFold model)
Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1	B	protein	351	Homo sapiens	P62873 (AlphaFold model)
scFv16	S	protein	247	Homo sapiens

Sequence of entity 1 (A), FASTA

>26XH_1 G protein subunit q (chains A)
MGCTLSAEDKAAVERSKMIEKQLQKDKQVYRRTLRLLLLGADNSGKSTIVKQMRIYHVNG
YSEEECKQYKAVVYSNTIQSIIAIIRAMGRLKIDFGDSARADDARQLFVLAGAAEEGFMT
AELAGVIKRLWKDSGVQACFNRSREYQLNDSAAYYLNDLDRIAQPNYIPTQQDVLRTRVK
TSGIFETKFQVDKVNFHMFDVGAQRDERRKWIQCFNDVTAIIFVVDSSDTNRLQEALNDF
DSIWNNRWLRTISVILFLNKQDLLAEKVLAGKSKIEDYFPEFARYTTPEDATPEPGEDPR
VTRAKYFIRKEFVDISTASGDGRHICYPHFTCAVDTENARRIFNDCKDIILQMNLREYNL
V

Sequence of entity 2 (G), FASTA

>26XH_2 Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2 (chains G)
MASNNTASIAQARKLVEQLKMEANIDRIKVSKAAADLMAYCEAHAKEDPLLTPVPASENP
FREKKFFCAIL

Sequence of entity 3 (N), FASTA

>26XH_3 Nanobody35 (chains N)
QVQLQESGGGLVQPGGSLRLSCAASGFTFSNYKMNWVRQAPGKGLEWVSDISQSGASISY
TGSVKGRFTISRDNAKNTLYLQMNSLKPEDTAVYYCARCPAPFTRDCFDVTSTTYAYRGQ
GTQVTVSSHHHHHHEPEA

Sequence of entity 4 (R), FASTA

>26XH_4 2-oxoglutarate receptor 1 (chains R)
MNEPLDYLANASDFPDYAAAFGNCTDENIPLKMHYLPVIYGIIFLVGFPGNAVVISTYIF
KMRPWKSSTIIMLNLACTDLLYLTSLPFLIHYYASGENWIFGDFMCKFIRFSFHFNLYSS
ILFLTCFSIFRYCVIIHPMSCFSIHKTRCAVVACAVVWIISLVAVIPMTFLITSTNRTNR
SACLDLTSSDELNTIKWYNLILTATTFCLPLVIVTLCYTTIIHTLTHGLQTDSCLKQKAR
RLTILLLLAFYVCFLPFHILRVIRIESRLLSISCSIENQIHEAYIVSRPLAALNTFGNLL
LYVVVSDNFQQAVCSTVRCKVSGNLEQAKKISYSNNP

Sequence of entity 5 (B), FASTA

>26XH_5 Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1 (chains B)
MHHHHHHGSLLQSELDQLRQEAEQLKNQIRDARKACADATLSQITNNIDPVGRIQMRTRR
TLRGHLAKIYAMHWGTDSRLLVSASQDGKLIIWDSYTTNKVHAIPLRSSWVMTCAYAPSG
NYVACGGLDNICSIYNLKTREGNVRVSRELAGHTGYLSCCRFLDDNQIVTSSGDTTCALW
DIETGQQTTTFTGHTGDVMSLSLAPDTRLFVSGACDASAKLWDVREGMCRQTFTGHESDI
NAICFFPNGNAFATGSDDATCRLFDLRADQELMTYSHDNIICGITSVSFSKSGRLLLAGY
DDFNCNVWDALKADRAGVLAGHDNRVSCLGVTDDGMAVATGSWDSFLKIWN

Sequence of entity 6 (S), FASTA

>26XH_6 scFv16 (chains S)
VQLVESGGGLVQPGGSRKLSCSASGFAFSSFGMHWVRQAPEKGLEWVAYISSGSGTIYYA
DTVKGRFTISRDDPKNTLFLQMTSLRSEDTAMYYCVRSIYYYGSSPFDFWGQGTTLTVSA
GGGGSGGGGSGGGGSSDIVMTQATSSVPVTPGESVSISCRSSKSLLHSNGNTYLYWFLQR
PGQSPQLLIYRMSNLASGVPDRFSGSGSGTAFTLTISRLEAEDVGVYYCMQHLEYPLTFG
AGTKLEL

Ligands and cofactors

ID	Name	Formula	Copies
MAE	Maleic acid	C4 H4 O4	1

Primary citation

Molecular architecture of OXGR1 reveals an evolutionary conserved mechanisms for metabolite surveillance. Zhang, X., Lu, Y., He, X. et al. EMBO J (2026) 45:4931-4955. DOI 10.1038/s44318-026-00823-y · PubMed

Other PDB entries of the same protein (UniProt P59768 (AlphaFold model), which also has an AlphaFold model), best resolution first:

8QEH 1.43 Å, Crystal structure of the G11 protein heterotrimer bound to FR900359 inhibitor
8QEG 1.7 Å, Crystal structure of the G11 protein heterotrimer bound to YM-254890 inhibitor
8F0K 1.9 Å, Human Amylin3 Receptor in complex with Gs and Pramlintide analogue peptide San385
9YDQ 1.94 Å, Human delta opioid receptor complex with mini-Gi and agonist DADLE and allosteric…
7MBX 1.95 Å, Human Cholecystokinin 1 receptor (CCK1R) Gs complex
9YDP 1.95 Å, Human delta opioid receptor complex with mini-Gi and agonist DADLE
6CRK 2.0 Å, Heterotrimeric G-protein in complex with an antibody fragment
8F0J 2.0 Å, Calcitonin Receptor in complex with Gs and Pramlintide analogue peptide San45
8F2B 2.0 Å, Amylin 3 Receptor in complex with Gs and Pramlintide analogue peptide San45
9XXT 2.0 Å, Cryo-EM structure of lysophosphatidylserine (18:0)-bound GPR174-Gs complex
9EJZ 2.06 Å, Human M5 muscarinic acetylcholine receptor complex with mini-Gq, agonist acetylcholine…
6X18 2.1 Å, GLP-1 peptide hormone bound to Glucagon-Like peptide-1 (GLP-1) Receptor

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