9W0U: T2R46

CryoEM structure of the T2R46 in complex with tangeretin and heterotrimeric G protein complex. Determined by electron microscopy at 2.9 Å resolution. Released 22 Apr 2026.

Method: Electron microscopy
Resolution: 2.9 Å
Organism: Homo sapiens
Chains: 4
Atoms: 6,672
Mol. weight: 128.99 kDa
Ligands: A1EUI
Released: 22 Apr 2026

Explore 9W0U in 3D Show helices and sheets RCSB PDB PDBe

Secondary structure: helices and β-sheets

9W0U contains 25 α-helices and 35 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: 7 helices, 7 β-strands

Element	Residues	Length	Sheet
α-helix	9-31	23
β-strand	34-39	6	1
β-strand	54	1	1
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	242-254	13
β-strand	263-269	7	1
α-helix	271-280	10
α-helix	296-309	14
β-strand	319-322	4	1
α-helix	328-350	23

Chain B: 5 helices, 28 β-strands

Element	Residues	Length	Sheet
α-helix	6-25	20
α-helix	30-33	4
α-helix	34-36	3
α-helix	38-40	3
β-strand	47-52	6	2
β-strand	58-62	5	3
β-strand	70-74	5	3
β-strand	78-83	6	3
β-strand	88-94	7	3
α-helix	95	1
β-strand	100-105	6	4
β-strand	111-116	6	4
β-strand	121-125	5	4
β-strand	134-139	6	4
β-strand	146-151	6	5
β-strand	156-161	6	5
β-strand	165-170	6	5
β-strand	176-181	6	5
β-strand	189-192	4	6
β-strand	198-202	5	6
β-strand	207-212	6	6
β-strand	218-223	6	6
β-strand	229-234	6	7
β-strand	240-245	6	7
β-strand	250-254	5	7
β-strand	259-264	6	7
β-strand	273-278	6	8
β-strand	284-289	6	8
β-strand	293-298	6	8
β-strand	304-309	6	8
β-strand	317-320	4	2
β-strand	327-330	4	2
β-strand	335-339	5	2

Chain C: 2 helices, 0 β-strands

Element	Residues	Length	Sheet
α-helix	10-23	14
α-helix	30-44	15

Chain R: 11 helices, 0 β-strands

Element	Residues	Length
α-helix	9-37	29
α-helix	43-71	29
α-helix	80-110	31
α-helix	116-123	8
α-helix	126-151	26
α-helix	174-180	7
α-helix	181-185	5
α-helix	186-211	26
α-helix	219-250	32
α-helix	263-282	20
α-helix	284-300	17

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	351	Homo sapiens	P62873 (AlphaFold model)
Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2	C	protein	71	Homo sapiens	P59768 (AlphaFold model)
Taste receptor type 2 member 46	R	protein	363	Homo sapiens	P59540 (AlphaFold model)

Sequence of entity 1 (A), FASTA

>9W0U_1 Guanine nucleotide-binding protein G(i) subunit alpha-1 (chains A)
MGCTLSAEDKAAVERSKMIDRNLREDGEKAAREVKLLLLGAGESGKNTIVKQMKIIHEAG
YSEEECKQYKAVVYSNTIQSIIAIIRAMGRLKIDFGDSARADDARQLFVLAGAAEEGFMT
AELAGVIKRLWKDSGVQACFNRSREYQLNDSAAYYLNDLDRIAQPNYIPTQQDVLRTRVK
TTGIVETHFTFKDLHFKMFDVTAQRSERKKWIHCFEGVTAIIFCVALSDYDLVLAEDEEM
NRMHASMKLFDSICNNKWFTDTSIILFLNKKDLFEEKIKKSPLTICYPEYAGSNTYEEAA
AYIQCQFEDLNKRKDTKEIYTHFTCSTDTKNVQFVFDAVTDVIIKNNLKDCGLF

Sequence of entity 2 (B), FASTA

>9W0U_2 Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1 (chains B)
MHHHHHHGSLLQSELDQLRQEAEQLKNQIRDARKACADATLSQITNNIDPVGRIQMRTRR
TLRGHLAKIYAMHWGTDSRLLVSASQDGKLIIWDSYTTNKVHAIPLRSSWVMTCAYAPSG
NYVACGGLDNICSIYNLKTREGNVRVSRELAGHTGYLSCCRFLDDNQIVTSSGDTTCALW
DIETGQQTTTFTGHTGDVMSLSLAPDTRLFVSGACDASAKLWDVREGMCRQTFTGHESDI
NAICFFPNGNAFATGSDDATCRLFDLRADQELMTYSHDNIICGITSVSFSKSGRLLLAGY
DDFNCNVWDALKADRAGVLAGHDNRVSCLGVTDDGMAVATGSWDSFLKIWN

Sequence of entity 3 (C), FASTA

>9W0U_3 Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2 (chains C)
MASNNTASIAQARKLVEQLKMEANIDRIKVSKAAADLMAYCEAHAKEDPLLTPVPASENP
FREKKFFCAIL

Sequence of entity 4 (R), FASTA

>9W0U_4 Taste receptor type 2 member 46 (chains R)
MKTIIALSYIFCLVFADYKDDDMITFLPIIFSILIVVTFVIGNFANGFIALVNSIEWFKR
QKISFADQILTALAVSRVGLLWVLLLNWYATELNPAFNSIEVRITAYNVWAVINHFSNWL
ATSLSIFYLLKIANFSNLIFLHLKRRVKSVVLVILLGPLLFLVCHLFVINMNQIIWTKEY
EGNMTWKIKLRSAMYLSNTTVTILANLVPFTLTLISFLLLICSLCKHLKKMQLHGKGSQD
PSMKVHIKALQTVTSFLLLCAIYFLSIIMSVWSFESLENKPVFMFCEAIAFSYPSTHPFI
LIWGNKKLKQTFLSVLWHVRYWVKGEFLEVLFQGPWSHPQFEKGGGSGGGSGGSAWSHPQ
FEK

Ligands and cofactors

ID	Name	Formula	Copies
A1EUI	5,6,7,8-tetramethoxy-2-(4-methoxyphenyl)chromen-4-one	C20 H20 O7	1

Primary citation

Ligand binding modes of the bitter taste receptor T2R14 and T2R46. Tan, Q., Yu, Y., Han, X. et al. Nat Struct Mol Biol (2026) 33:691-700. DOI 10.1038/s41594-026-01786-8 · 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…

Browse structure collections

About this viewer

MolViewer shows 9W0U directly in your browser with nothing to install. Switch between cartoon, ball-and-stick, spacefill and surface views, color by chain, secondary structure or B-factor, measure distances, angles and dihedrals, and share or embed the view.