9X3Z: NPFF bound Mas1 Receptor Complex

NPFF bound Mas1 Receptor Complex. Determined by electron microscopy at 2.54 Å resolution. Released 15 Apr 2026.

Method: Electron microscopy
Resolution: 2.54 Å
Organism: Homo sapiens
Chains: 6
Atoms: 8,360
Mol. weight: 152.15 kDa
Released: 15 Apr 2026

Explore 9X3Z in 3D Show helices and sheets RCSB PDB PDBe

Secondary structure: helices and β-sheets

9X3Z contains 37 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: 8 helices, 6 β-strands

Element	Residues	Length	Sheet
α-helix	7-32	26
β-strand	33-40	8	1
α-helix	46-52	7
β-strand	184-191	8	1
β-strand	194-201	8	1
α-helix	211-215	5
β-strand	220-226	7	1
α-helix	233-244	12
α-helix	247-249	3
β-strand	254-259	6	1
α-helix	261-267	7
α-helix	299-317	19
β-strand	326-330	5	1
α-helix	338-357	20

Chain B: 4 helices, 28 β-strands

Element	Residues	Length	Sheet
α-helix	12-30	19
α-helix	35-38	4
α-helix	43-44	2
β-strand	52-56	5	2
β-strand	63-68	6	3
β-strand	74-79	6	3
β-strand	83-88	6	3
β-strand	94-99	6	3
β-strand	105-110	6	4
β-strand	116-121	6	4
β-strand	126-130	5	4
β-strand	139-144	6	4
β-strand	151-156	6	5
β-strand	161-166	6	5
β-strand	171-175	5	5
β-strand	180-185	6	5
β-strand	192-197	6	6
β-strand	203-208	6	6
β-strand	213-217	5	6
β-strand	223-227	5	6
β-strand	234-239	6	7
β-strand	245-250	6	7
β-strand	255-259	5	7
β-strand	264-269	6	7
α-helix	277	1
β-strand	278-283	6	8
β-strand	289-294	6	8
β-strand	299-303	5	8
β-strand	309-313	5	8
β-strand	320-325	6	2
β-strand	332-336	5	2
β-strand	341-344	4	2

Chain G: 5 helices, 0 β-strands

Element	Residues	Length
α-helix	9-23	15
α-helix	30-43	14
α-helix	45-47	3
α-helix	53-55	3
α-helix	56-58	3

Chain R: 14 helices, 0 β-strands

Element	Residues	Length
α-helix	34-59	26
α-helix	65-92	28
α-helix	102-135	34
α-helix	137-142	6
α-helix	148-166	19
α-helix	167-172	6
α-helix	182-193	12
α-helix	194-199	6
α-helix	200-215	16
α-helix	226-236	11
α-helix	237-241	5
α-helix	242-254	13
α-helix	261-277	17
α-helix	278-282	5

Chain S: 6 helices, 24 β-strands

Element	Residues	Length	Sheet
β-strand	3-7	5	9
β-strand	10-12	3	10
β-strand	17-25	9	9
α-helix	29-31	3
β-strand	33-39	7	10
β-strand	45-51	7	10
β-strand	58-60	3	10
α-helix	62-64	3
β-strand	68-73	6	9
β-strand	78-84	7	9
α-helix	88-90	3
β-strand	92-99	8	10
β-strand	110-111	2	10
β-strand	115-119	5	10
α-helix	138-139	2
β-strand	140-141	2	11
β-strand	146	1	12
β-strand	155-161	7	11
β-strand	166	1	13
β-strand	172	1	13
β-strand	174-179	6	12
β-strand	186-190	5	12
β-strand	194-195	2	12
α-helix	196	1
β-strand	203-207	5	11
β-strand	211-216	6	11
α-helix	221-223	3
β-strand	226-231	6	12
β-strand	238-239	2	12
β-strand	243-244	2	12

Molecules and chains

Molecule	Chains	Type	Length	Organism	UniProt
Proto-oncogene Mas	R	protein	325	Homo sapiens	P04201 (AlphaFold model)
Chimeric Gi protein	A	protein	361	Homo sapiens	A0A5A9NRD5 (AlphaFold model)
Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1	B	protein	345	Homo sapiens	P62873 (AlphaFold model)
ScFv16	S	protein	247	Homo sapiens
Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2	G	protein	70	Homo sapiens	P59768 (AlphaFold model)
Npff	L	protein	8	Homo sapiens

Sequence of entity 1 (R), FASTA

>9X3Z_1 Proto-oncogene Mas (chains R)
MDGSNVTSFVVEEPTNISTGRNASVGNAHRQIPIVHWVIMSISPVGFVENGILLWFLCFR
MRRNPFTVYITHLSIADISLLFCIFILSIDYALDYELSSGHYYTIVTLSVTFLFGYNTGL
YLLTAISVERCLSVLYPIWYRCHRPKYQSALVCALLWALSCLVTTMEYVMCIDREEESHS
RNDCRAVIIFIAILSFLVFTPLMLVSSTILVVKIRKNTWASHSSKLYIVIMVTIIIFLIF
AMPMRLLYLLYYEYWSTFGNLHHISLLFSTINSSANPFIYFFVGSSKKKRFKESLKVVLT
RAFKDEMQPRRQKDNCNTVTVETVV

Sequence of entity 2 (A), FASTA

>9X3Z_2 Chimeric Gi protein (chains A)
MGCTLSAEDKAAVERSKMIEKQLQKDKQVYRATHRLLLLGADNSGKSTIVKQMRIYHVNG
YSEEECKQYKAVVYSNTIQSIIAIIRAMGRLKIDFGDSARADDARQLFVLAGAAEEGFMT
AELAGVIKRLWKDSGVQACFNRSREYQLNDSAAYYLNDLDRIAQPNYIPTQQDVLRTRVK
TSGIFETKFQVDKVNFHMFDVGAQRDERRKWIQCFNDVTAIIFVVDSSDYNRLQEALNDF
KSIWNNRWLRTISVILFLNKQDLLAEKVLAGKSKIEDYFPEFARYTTPEDATPEPGEDPR
VTRAKYFIRDEFLRISTASGDGRHYCYPHFTCSVDTENARRIFNDVTDIIIKMNLRDCGL
F

Sequence of entity 3 (B), FASTA

>9X3Z_3 Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1 (chains B)
MGSLLQSELDQLRQEAEQLKNQIRDARKACADATLSQITNNIDPVGRIQMRTRRTLRGHL
AKIYAMHWGTDSRLLVSASQDGKLIIWDSYTTNKVHAIPLRSSWVMTCAYAPSGNYVACG
GLDNICSIYNLKTREGNVRVSRELAGHTGYLSCCRFLDDNQIVTSSGDTTCALWDIETGQ
QTTTFTGHTGDVMSLSLAPDTRLFVSGACDASAKLWDVREGMCRQTFTGHESDINAICFF
PNGNAFATGSDDATCRLFDLRADQELMTYSHDNIICGITSVSFSKSGRLLLAGYDDFNCN
VWDALKADRAGVLAGHDNRVSCLGVTDDGMAVATGSWDSFLKIWN

Sequence of entity 4 (S), FASTA

>9X3Z_4 ScFv16 (chains S)
VQLVESGGGLVQPGGSRKLSCSASGFAFSSFGMHWVRQAPEKGLEWVAYISSGSGTIYYA
DTVKGRFTISRDDPKNTLFLQMTSLRSEDTAMYYCVRSIYYYGSSPFDFWGQGTTLTVSA
GGGGSGGGGSGGGGSADIVMTQATSSVPVTPGESVSISCRSSKSLLHSNGNTYLYWFLQR
PGQSPQLLIYRMSNLASGVPDRFSGSGSGTAFTLTISRLEAEDVGVYYCMQHLEYPLTFG
AGTKLEL

Sequence of entity 5 (G), FASTA

>9X3Z_5 Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2 (chains G)
ASNNTASIAQARKLVEQLKMEANIDRIKVSKAAADLMAYCEAHAKEDPLLTPVPASENPF
REKKFFCAIL

Sequence of entity 6 (L), FASTA

>9X3Z_6 NPFF (chains L)
FLFQPQRF

Primary citation

Structural insight into ligand binding and activation of the orphan GPCR Mas1. Zhang, Y., Wang, Q., Liu, H. et al. EMBO J (2026) 45:3500-3513. DOI 10.1038/s44318-026-00764-6 · PubMed

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

9X3Y 2.77 Å, NPFF bound Mas1 Receptor
9JLC 2.98 Å, Cryo-EM structure of MAS1-Gi Complex with AVE 0991
25IK 3.0 Å, Cryo-EM structure of MasR(FL)-Gq
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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