8Y73: PDB entry 8Y73

positive allosteric modulator(MPAM-15)-bound mu-opioid receptor-Gi complex. Determined by electron microscopy at 2.84 Å resolution. Released 6 Aug 2025.

Method: Electron microscopy
Resolution: 2.84 Å
Organisms: Homo sapiens, Rattus norvegicus, Bos taurus
Chains: 6
Atoms: 9,038
Mol. weight: 160.66 kDa
Ligands: CLR, A1D6C
Released: 6 Aug 2025

Explore 8Y73 in 3D Show helices and sheets RCSB PDB PDBe

Secondary structure: helices and β-sheets

8Y73 contains 46 α-helices and 64 β-strands across 5 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: 12 helices, 8 β-strands

Element	Residues	Length	Sheet
α-helix	7-31	25
β-strand	33-39	7	1
α-helix	46-49	4
β-strand	185-191	7	1
β-strand	194-200	7	1
α-helix	208-210	3
α-helix	212-215	4
β-strand	220-226	7	1
α-helix	227-229	3
α-helix	232	1
β-strand	233	1	2
α-helix	234	1
β-strand	241	1	2
α-helix	242-254	13
β-strand	264-269	6	1
α-helix	271-280	10
α-helix	283-285	3
α-helix	296-308	13
β-strand	319-324	6	1
α-helix	331-351	21

Chain B: 5 helices, 28 β-strands

Element	Residues	Length	Sheet
α-helix	7-25	19
α-helix	30-33	4
α-helix	38-39	2
β-strand	47-52	6	3
β-strand	58-63	6	4
β-strand	69-74	6	4
β-strand	78-83	6	4
β-strand	88-94	7	4
α-helix	95	1
β-strand	100-105	6	5
β-strand	111-116	6	5
β-strand	121-125	5	5
β-strand	134-139	6	5
β-strand	146-153	8	6
β-strand	156-161	6	6
β-strand	165-170	6	6
β-strand	175-181	7	6
β-strand	187-192	6	7
β-strand	198-203	6	7
β-strand	207-212	6	7
β-strand	217-223	7	7
β-strand	229-234	6	8
β-strand	240-245	6	8
β-strand	250-254	5	8
β-strand	259-264	6	8
α-helix	272	1
β-strand	273-278	6	9
β-strand	284-289	6	9
β-strand	294-298	5	9
β-strand	304-308	5	9
β-strand	315-320	6	3
β-strand	327-331	5	3
β-strand	335-339	5	3

Chain C: 5 helices, 0 β-strands

Element	Residues	Length
α-helix	10-23	14
α-helix	30-43	14
α-helix	45-47	3
α-helix	53-55	3
α-helix	56-58	3

Chain E: 8 helices, 24 β-strands

Element	Residues	Length	Sheet
β-strand	3-7	5	10
β-strand	10-12	3	11
β-strand	18-25	8	10
α-helix	29-31	3
β-strand	33-39	7	11
β-strand	45-51	7	11
α-helix	53-55	3
β-strand	58-60	3	11
α-helix	62-64	3
β-strand	68-73	6	10
β-strand	78-83	6	10
α-helix	88-90	3
β-strand	92-99	8	11
β-strand	110-111	2	11
β-strand	115-119	5	11
β-strand	141-143	3	12
β-strand	147-149	3	13
β-strand	156-162	7	12
β-strand	167	1	14
β-strand	173	1	14
β-strand	175-180	6	13
β-strand	187-191	5	13
β-strand	195-196	2	13
α-helix	197	1
β-strand	204-209	6	12
β-strand	212-217	6	12
α-helix	222-224	3
β-strand	227-232	6	13
α-helix	239	1
β-strand	240	1	13
α-helix	241	1
β-strand	244-247	4	13

Chain R: 16 helices, 4 β-strands

Element	Residues	Length	Sheet
α-helix	67-94	28
α-helix	95-99	5
α-helix	104-120	17
α-helix	123-132	10
α-helix	140-172	33
α-helix	174-180	7
α-helix	183-196	14
α-helix	198-207	10
β-strand	208	1	15
β-strand	211-213	3	16
β-strand	216-218	3	16
β-strand	221	1	15
α-helix	231-239	9
α-helix	240-244	5
α-helix	245-263	19
α-helix	265-267	3
α-helix	271-307	37
α-helix	314-334	21
α-helix	335-339	5
α-helix	343-350	8

Molecules and chains

Molecule	Chains	Type	Length	Organism	UniProt
Guanine nucleotide-binding protein G(i) subunit alpha-1	A	protein	354	Homo sapiens	P63096 (AlphaFold model)
Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1	B	protein	353	Rattus norvegicus	P54311 (AlphaFold model)
Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2	C	protein	68	Bos taurus	P63212 (AlphaFold model)
scFv16	E	protein	248	synthetic construct
Mu-type opioid receptor	R	protein	403	Homo sapiens	P35372 (AlphaFold model)
Tyr-dal-gly-mea-eta	D	protein	5	synthetic construct

Sequence of entity 1 (A), FASTA

>8Y73_1 Guanine nucleotide-binding protein G(i) subunit alpha-1 (chains A)
MGCTLSAEDKAAVERSKMIDRNLREDGEKAAREVKLLLLGAGESGKSTIVKQMKIIHEAG
YSEEECKQYKAVVYSNTIQSIIAIIRAMGRLKIDFGDSARADDARQLFVLAGAAEEGFMT
AELAGVIKRLWKDSGVQACFNRSREYQLNDSAAYYLNDLDRIAQPNYIPTQQDVLRTRVK
TTGIVETHFTFKDLHFKMFDVGAQRSERKKWIHCFEGVTAIIFCVALSDYDLVLAEDEEM
NRMHESMKLFDSICNNKWFTDTSIILFLNKKDLFEEKIKKSPLTICYPEYAGSNTYEEAA
AYIQCQFEDLNKRKDTKEIYTHFTCSTDTKNVQFVFDAVTDVIIKNNLKDCGLF

Sequence of entity 2 (B), FASTA

>8Y73_2 Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1 (chains B)
MHHHHHHHHGSLLQSELDQLRQEAEQLKNQIRDARKACADATLSQITNNIDPVGRIQMRT
RRTLRGHLAKIYAMHWGTDSRLLVSASQDGKLIIWDSYTTNKVHAIPLRSSWVMTCAYAP
SGNYVACGGLDNICSIYNLKTREGNVRVSRELAGHTGYLSCCRFLDDNQIVTSSGDTTCA
LWDIETGQQTTTFTGHTGDVMSLSLAPDTRLFVSGACDASAKLWDVREGMCRQTFTGHES
DINAICFFPNGNAFATGSDDATCRLFDLRADQELMTYSHDNIICGITSVSFSKSGRLLLA
GYDDFNCNVWDALKADRAGVLAGHDNRVSCLGVTDDGMAVATGSWDSFLKIWN

Sequence of entity 3 (C), FASTA

>8Y73_3 Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2 (chains C)
MASNNTASIAQARKLVEQLKMEANIDRIKVSKAAADLMAYCEAHAKEDPLLTPVPASENP
FREKKFFC

Sequence of entity 4 (E), FASTA

>8Y73_4 scFv16 (chains E)
MVQLVESGGGLVQPGGSRKLSCSASGFAFSSFGMHWVRQAPEKGLEWVAYISSGSGTIYY
ADTVKGRFTISRDDPKNTLFLQMTSLRSEDTAMYYCVRSIYYYGSSPFDFWGQGTTLTVS
AGGGGSGGGGSGGGGSADIVMTQATSSVPVTPGESVSISCRSSKSLLHSNGNTYLYWFLQ
RPGQSPQLLIYRMSNLASGVPDRFSGSGSGTAFTLTISRLEAEDVGVYYCMQHLEYPLTF
GAGTKLEL

Sequence of entity 5 (R), FASTA

>8Y73_5 Mu-type opioid receptor (chains R)
DYKDDDDVDSSAAPTNASNCTDALAYSSCSPAPSPGSWVNLSHLDGNLSDPCGPNRTDLG
GRDSLCPPTGSPSMITAITIMALYSIVCVVGLFGNFLVMYVIVRYTKMKTATNIYIFNLA
LADALATSTLPFQSVNYLMGTWPFGTILCKIVISIDYYNMFTSIFTLCTMSVDRYIAVCH
PVKALDFRTPRNAKIINVCNWILSSAIGLPVMFMATTKYRQGSIDCTLTFSHPTWYWENL
LKICVFIFAFIMPVLIITVCYGLMILRLKSVRMLSGSKEKDRNLRRITRMVLVVVAVFIV
CWTPIHIYVIIKALVTIPETTFQTVSWHFCIALGYTNSCLNPVLYAFLDENFKRCFREFC
IPTSSNIEQQNSTRIRQNTRDHPSTANTVDRTNHQHHHHHHHH

Sequence of entity 6 (D), FASTA

>8Y73_6 TYR-DAL-GLY-MEA-ETA (chains D)
YAGFX

Ligands and cofactors

ID	Name	Formula	Copies
CLR	Cholesterol	C27 H46 O	2
A1D6C	9-[5-(3-chlorophenyl)furan-2-yl]-3,3,6,6-tetramethyl-4,5,7,9-tetrahydro-2~{H}-x…	C27 H27 Cl O4	1

Primary citation

Structure-based design of an opioid receptor modulator for enhanced morphine analgesia. Wang, Y., Luo, P., Xu, H. et al. Sci Adv (2026) 12:eaea9832-eaea9832. DOI 10.1126/sciadv.aea9832 · PubMed

Other PDB entries of the same protein (UniProt P63096 (AlphaFold model), which also has an AlphaFold model), best resolution first:

6CRK 2.0 Å, Heterotrimeric G-protein in complex with an antibody fragment
3UMR 2.04 Å, Crystal structure of the G202D mutant of human G-alpha-i1
9P7Z 2.1 Å, NTSR1-Gi-NTS(8-13) Complex in the Canonical, AHD Open State (C-Open-Apo)
2OM2 2.2 Å, Crystal Structure Of Human G[alpha]i1 Bound To The Goloco Motif Of Rgs14
8YN9 2.3 Å, Cryo-EM structure of histamine H4 receptor in complex with histamine and Gi
9HYI 2.3 Å, DP81-bound serotonin 5-HT1A receptor - Gi Protein Complex
9O36 2.3 Å, CryoEM structure of mu-opioid receptor - Gi protein complex bound to fluornitrazene (FNZ)
9P80 2.3 Å, NTSR1-Gi-NTS(8-13) Complex in the Non-Canonical, AHD Open State (NC-Open-Apo)
8XXV 2.33 Å, Cryo-EM Structure of the Prostaglandin D2 Receptor 2-indomethacin Coupled to G Protein
3UMS 2.34 Å, Crystal structure of the G202A mutant of human G-alpha-i1
3ONW 2.38 Å, Structure of a G-alpha-i1 mutant with enhanced affinity for the RGS14 GoLoco motif.
20ZG 2.4 Å, Cryo-EM structure of the human neurotensin receptor 1 (hNTSR1)-Gi1 complex in the…

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