25IK: MasR(FL)-Gq

Cryo-EM structure of MasR(FL)-Gq. Determined by electron microscopy at 3.0 Å resolution. Released 20 May 2026.

Method: Electron microscopy
Resolution: 3.0 Å
Organisms: Escherichia coli, Homo sapiens, synthetic construct
Chains: 5
Atoms: 8,338
Mol. weight: 174.54 kDa
Released: 20 May 2026

Explore 25IK in 3D Show helices and sheets RCSB PDB PDBe

Secondary structure: helices and β-sheets

25IK contains 38 α-helices and 58 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, 6 β-strands

Element	Residues	Length	Sheet
α-helix	7-31	25
β-strand	33-39	7	1
α-helix	42-44	3
α-helix	46-48	3
β-strand	69-76	8	1
β-strand	79-86	8	1
α-helix	95-100	6
β-strand	105-111	7	1
α-helix	118-129	12
β-strand	138-144	7	1
α-helix	146-154	9
α-helix	160-163	4
α-helix	165-168	4
α-helix	170-174	5
α-helix	178-179	2
α-helix	184-203	20
β-strand	211-215	5	1
α-helix	223-242	20

Chain B: 4 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	2
β-strand	58-63	6	3
β-strand	69-74	6	3
β-strand	78-83	6	3
β-strand	88-94	7	3
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	166-170	5	5
β-strand	175-180	6	5
β-strand	187-192	6	6
β-strand	198-203	6	6
β-strand	208-212	5	6
β-strand	218-222	5	6
β-strand	229-234	6	7
β-strand	240-245	6	7
β-strand	250-254	5	7
β-strand	260-264	5	7
α-helix	272	1
β-strand	273-278	6	8
β-strand	284-289	6	8
β-strand	294-298	5	8
β-strand	304-308	5	8
β-strand	317-320	4	2
β-strand	327-330	4	2
β-strand	336-339	4	2

Chain C: 3 helices, 0 β-strands

Element	Residues	Length
α-helix	7-23	17
α-helix	30-43	14
α-helix	53-55	3

Chain R: 14 helices, 0 β-strands

Element	Residues	Length
α-helix	34-59	26
α-helix	67-91	25
α-helix	92-94	3
α-helix	102-135	34
α-helix	137-141	5
α-helix	148-167	20
α-helix	168-172	5
α-helix	183-195	13
α-helix	199-215	17
α-helix	228-236	9
α-helix	237-241	5
α-helix	242-253	12
α-helix	260-277	18
α-helix	278-282	5

Chain S: 5 helices, 24 β-strands

Element	Residues	Length	Sheet
β-strand	3-6	4	9
β-strand	10-12	3	10
β-strand	18-25	8	9
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
β-strand	68-73	6	9
β-strand	78-83	6	9
α-helix	88-90	3
β-strand	93-99	7	11
β-strand	110-116	7	11
β-strand	117-119	3	10
β-strand	128-129	2	12
β-strand	134-137	4	13
β-strand	143-149	7	12
β-strand	154	1	14
β-strand	160	1	14
β-strand	162-167	6	13
β-strand	174-178	5	13
β-strand	182-183	2	13
α-helix	184	1
β-strand	191-196	6	12
β-strand	199-204	6	12
β-strand	213-219	7	13
α-helix	225	1
β-strand	227	1	13
β-strand	231-235	5	13

Molecules and chains

Molecule	Chains	Type	Length	Organism	UniProt
Soluble cytochrome b562,Proto-oncogene Mas,LgBiT tag	R	protein	620	Escherichia coli, Homo sapiens, synthetic construct	P04201 (AlphaFold model)
Gs-mini-Gq chimera	A	protein	246	Homo sapiens
Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1	B	protein	382	Homo sapiens	P62873 (AlphaFold model)
Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2	C	protein	70	Mus musculus	P63213 (AlphaFold model)
scFv16	S	protein	248	synthetic construct

Sequence of entity 1 (R), FASTA

>25IK_1 Soluble cytochrome b562,Proto-oncogene Mas,LgBiT tag (chains R)
MKTIIALSYIFCLVFADYKDDDDKADLEDNWETLNDNLKVIEKADNAAQVKDALTKMRAA
ALDAQKATPPKLEDKSPDSPEMKDFRHGFDILVGQIDDALKLANEGKVKEAQAAAEQLKT
TRNAYIQKYLDGSNVTSFVVEEPTNISTGRNASVGNAHRQIPIVHWVIMSISPVGFVENG
ILLWFLCFRMRRNPFTVYITHLSIADISLLFCIFILSIDYALDYELSSGHYYTIVTLSVT
FLFGYNTGLYLLTAISVERCLSVLYPIWYRCHRPKYQSALVCALLWALSCLVTTMEYVMC
IDREEESHSRNDCRAVIIFIAILSFLVFTPLMLVSSTILVVKIRKNTWASHSSKLYIVIM
VTIIIFLIFAMPMRLLYLLYYEYWSTFGNLHHISLLFSTINSSANPFIYFFVGSSKKKRF
KESLKVVLTRAFKDEMQPRRQKDNCNTVTVETVVENLYFQGSVFTLEDFVGDWEQTAAYN
LDQVLEQGGVSSLLQNLAVSVTPIQRIVRSGENALKIDIHVIIPYEGLSADQMAQIEEVF
KVVYPVDDHHFKVILPYGTLVIDGVTPNMLNYFGRPYEGIAVFDGKKITVTGTLWNGNKI
IDERLITPDGSMLFRVTINS

Sequence of entity 2 (A), FASTA

>25IK_2 Gs-mini-Gq chimera (chains A)
MGSTVSAEDKAAAERSKMIDKNLREDGEKARRTLRLLLLGADNSGKSTIVKQMRILHGGS
GGSGGTSGIFETKFQVDKVNFHMFDVGGQRDERRKWIQCFNDVTAIIFVVDSSDYNRLQE
ALNDFKSIWNNRWLRTISVILFLNKQDLLAEKVLAGKSKIEDYFPEFARYTTPEDATPEP
GEDPRVTRAKYFIRKEFVDISTASGDGRHICYPHFTCAVDTENARRIFNDCKDIILQMNL
REYNLV

Sequence of entity 3 (B), FASTA

>25IK_3 Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1 (chains B)
MHHHHHHHHENLYFQGSSELDQLRQEAEQLKNQIRDARKACADATLSQITNNIDPVGRIQ
MRTRRTLRGHLAKIYAMHWGTDSRLLVSASQDGKLIIWDSYTTNKVHAIPLRSSWVMTCA
YAPSGNYVACGGLDNICSIYNLKTREGNVRVSRELAGHTGYLSCCRFLDDNQIVTSSGDT
TCALWDIETGQQTTTFTGHTGDVMSLSLAPDTRLFVSGACDASAKLWDVREGMCRQTFTG
HESDINAICFFPNGNAFATGSDDATCRLFDLRADQELMTYSHDNIICGITSVSFSKSGRL
LLAGYDDFNCNVWDALKADRAGVLAGHDNRVSCLGVTDDGMAVATGSWDSFLKIWNGGSG
GGGSGGSSSGGVSGWRLFKKIS

Sequence of entity 4 (C), FASTA

>25IK_4 Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2 (chains C)
ASNNTASIAQARKLVEQLKMEANIDRIKVSKAAADLMAYCEAHAKEDPLLTPVPASENPF
REKKFFCAIL

Sequence of entity 5 (S), FASTA

>25IK_5 scFv16 (chains S)
DVQLVESGGGLVQPGGSRKLSCSASGFAFSSFGMHWVRQAPEKGLEWVAYISSGSGTIYY
ADTVKGRFTISRDDPKNTLFLQMTSLRSEDTAMYYCVRSIYYYGSSPFDFWGQGTTLTVS
SGGGGSGGGGSGGGGSDIVMTQATSSVPVTPGESVSISCRSSKSLLHSNGNTYLYWFLQR
PGQSPQLLIYRMSNLASGVPDRFSGSGSGTAFTLTISRLEAEDVGVYYCMQHLEYPLTFG
AGTKLELK

Primary citation

Cryo-EM Structure of the Human Mas Receptor Reveals N-terminal Occlusion of the Orthosteric Ligand Binding Pocket. Suzuki, S., Tanaka, K., Nishikawa, K. et al. J Mol Biol (2026) 438:169844-169844. DOI 10.1016/j.jmb.2026.169844 · PubMed

Other PDB entries of the same protein (UniProt P04201 (AlphaFold model), which also has an AlphaFold model), best resolution first:

9X3Z 2.54 Å, NPFF bound Mas1 Receptor Complex
9X3Y 2.77 Å, NPFF bound Mas1 Receptor
9JLC 2.98 Å, Cryo-EM structure of MAS1-Gi Complex with AVE 0991
9X40 3.07 Å, AR234958 bound Mas1 Receptor Complex
25IL 3.2 Å, Cryo-EM structure of MasR(del2-25)-Gq
9X41 3.31 Å, AR234958 bound Mas1 Receptor

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