9OUP: Gamma-aminobutyric acid receptor subunit alpha-1

Native GABA-A receptor from rat cerebella, beta2-alpha1-beta1-alpha6-gamma2 subtype, in complex with GABA. Determined by electron microscopy at 2.82 Å resolution. Released 18 Feb 2026.

Method: Electron microscopy
Resolution: 2.82 Å
Organisms: Rattus norvegicus, Mus musculus
Chains: 7
Atoms: 10,642
Mol. weight: 318.92 kDa
Ligands: NAG, ABU
Released: 18 Feb 2026

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

Secondary structure: helices and β-sheets

9OUP contains 24 α-helices and 91 β-strands across 7 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: 3 helices, 14 β-strands

Element	Residues	Length	Sheet
α-helix	12-22	11
β-strand	38-53	16	1
β-strand	58-70	13	1
β-strand	82-85	4	1
α-helix	87-90	4
β-strand	98-100	3	2
β-strand	103	1	1
β-strand	107-108	2	1
β-strand	116-121	6	1
β-strand	125-137	13	1
β-strand	149-158	10	2
β-strand	166-170	5	1
α-helix	174-176	3
β-strand	178-180	3	1
β-strand	185	1	1
β-strand	190-203	14	2
β-strand	208-220	13	2

Chain B: 5 helices, 14 β-strands

Element	Residues	Length	Sheet
α-helix	9-20	12
α-helix	35	1
β-strand	36-47	12	3
β-strand	51	1	3
β-strand	56-68	13	3
α-helix	80	1
β-strand	81-83	3	3
α-helix	85-89	5
β-strand	96-98	3	4
β-strand	101-106	6	3
β-strand	110	1	2
β-strand	114-118	5	3
β-strand	123-135	13	3
β-strand	147-156	10	4
β-strand	164-168	5	3
α-helix	171-174	4
β-strand	175-176	2	3
β-strand	186-199	14	4
β-strand	204-216	13	4

Chain C: 3 helices, 14 β-strands

Element	Residues	Length	Sheet
α-helix	10-20	11
α-helix	35-36	2
β-strand	37-52	16	5
β-strand	57-69	13	5
β-strand	81-83	3	5
α-helix	88-91	4
β-strand	97-99	3	6
β-strand	102	1	5
β-strand	106-107	2	5
β-strand	115-120	6	5
β-strand	124-136	13	5
β-strand	148-157	10	6
β-strand	165-169	5	5
β-strand	177-178	2	5
β-strand	184	1	5
β-strand	189-202	14	6
β-strand	207-219	13	6

Chain D: 2 helices, 11 β-strands

Element	Residues	Length	Sheet
α-helix	26-35	10
β-strand	51-66	16	7
β-strand	71-83	13	7
β-strand	95-98	4	7
α-helix	100-105	6
β-strand	111-113	3	8
β-strand	116-121	6	7
β-strand	129-134	6	7
β-strand	138-150	13	7
β-strand	162-171	10	8
β-strand	179-190	12	7
β-strand	201-213	13	8
β-strand	220-231	12	8

Chain E: 7 helices, 13 β-strands

Element	Residues	Length	Sheet
α-helix	8-20	13
α-helix	28	1
α-helix	35	1
β-strand	36-51	16	9
β-strand	56-68	13	9
α-helix	70-72	3
α-helix	80	1
β-strand	81-83	3	9
α-helix	85-89	5
β-strand	96-98	3	10
β-strand	101-106	6	9
β-strand	110	1	8
β-strand	114-118	5	9
β-strand	123-135	13	9
β-strand	147-156	10	10
β-strand	164-168	5	9
α-helix	171-174	4
β-strand	175-176	2	9
β-strand	186-200	15	10
β-strand	203-216	14	10

Chain H: 2 helices, 13 β-strands

Element	Residues	Length	Sheet
β-strand	3-6	4	11
β-strand	10-12	3	12
β-strand	18-25	8	11
β-strand	34-39	6	12
β-strand	45-52	8	12
β-strand	56-59	4	12
α-helix	61-63	3
β-strand	64	1	11
β-strand	67-72	6	11
β-strand	77-82	6	11
α-helix	84-86	3
β-strand	88-95	8	12
β-strand	100A-103	4	12
β-strand	104	1	11
β-strand	107-111	5	12

Chain L: 2 helices, 12 β-strands

Element	Residues	Length	Sheet
β-strand	4-6	3	13
β-strand	10-12	3	14
β-strand	19-25	7	13
β-strand	33-38	6	14
β-strand	45-49	5	14
β-strand	53-54	2	14
α-helix	55	1
β-strand	62-66	5	13
β-strand	70-75	6	13
α-helix	80-82	3
β-strand	85-90	6	14
β-strand	96-97	2	14
β-strand	98	1	13
β-strand	101-104	4	14

Molecules and chains

Molecule	Chains	Type	Length	Organism	UniProt
Gamma-aminobutyric acid receptor subunit alpha-1	A	protein	455	Rattus norvegicus	P62813 (AlphaFold model)
Gamma-aminobutyric acid receptor subunit beta-1	B	protein	474	Rattus norvegicus	P15431 (AlphaFold model)
Gamma-aminobutyric acid receptor subunit alpha-6	C	protein	453	Rattus norvegicus	P30191 (AlphaFold model)
Gamma-aminobutyric acid receptor subunit gamma-2	D	protein	466	Rattus norvegicus	P18508 (AlphaFold model)
Gamma-aminobutyric acid receptor subunit beta-2	E	protein	474	Rattus norvegicus	P63138
8E3 fab heavy chain	H	protein	223	Mus musculus
8E3 fab light chain	L	protein	213	Mus musculus

Sequence of entity 1 (A), FASTA

>9OUP_1 Gamma-aminobutyric acid receptor subunit alpha-1 (chains A)
MKKSRGLSDYLWAWTLILSTLSGRSYGQPSQDELKDNTTVFTRILDRLLDGYDNRLRPGL
GERVTEVKTDIFVTSFGPVSDHDMEYTIDVFFRQSWKDERLKFKGPMTVLRLNNLMASKI
WTPDTFFHNGKKSVAHNMTMPNKLLRITEDGTLLYTMRLTVRAECPMHLEDFPMDAHACP
LKFGSYAYTRAEVVYEWTREPARSVVVAEDGSRLNQYDLLGQTVDSGIVQSSTGEYVVMT
THFHLKRKIGYFVIQTYLPCIMTVILSQVSFWLNRESVPARTVFGVTTVLTMTTLSISAR
NSLPKVAYATAMDWFIAVCYAFVFSALIEFATVNYFTKRGYAWDGKSVVPEKPKKVKDPL
IKKNNTYAPTATSYTPNLARGDPGLATIAKSATIEPKEVKPETKPPEPKKTFNSVSKIDR
LSRIAFPLLFGIFNLVYWATYLNREPQLKAPTPHQ

Sequence of entity 2 (B), FASTA

>9OUP_2 Gamma-aminobutyric acid receptor subunit beta-1 (chains B)
MWTVQNRESLGLLSFPVMVAMVCCAHSSNEPSNMSYVKETVDRLLKGYDIRLRPDFGGPP
VDVGMRIDVASIDMVSEVNMDYTLTMYFQQSWKDKRLSYSGIPLNLTLDNRVADQLWVPD
TYFLNDKKSFVHGVTVKNRMIRLHPDGTVLYGLRITTTAACMMDLRRYPLDEQNCTLEIE
SYGYTTDDIEFYWNGGEGAVTGVNKIELPQFSIVDYKMVSKKVEFTTGAYPRLSLSFRLK
RNIGYFILQTYMPSTLITILSWVSFWINYDASAARVALGITTVLTMTTISTHLRETLPKI
PYVKAIDIYLMGCFVFVFLALLEYAFVNYIFFGKGPQKKGASKQDQSANEKNKLEMNKVQ
VDAHGNILLSTLEIRNETSGSEVLTGVSDPKATMYSYDSASIQYRKPLSSREGFGRGLDR
HGVPGKGRIRRRASQLKVKIPDLTDVNSIDKWSRMFFPITFSLFNVVYWLYYVH

Sequence of entity 3 (C), FASTA

>9OUP_3 Gamma-aminobutyric acid receptor subunit alpha-6 (chains C)
MLLLLPWLFSLLWIENAQAQLEDEGNFYSENVSRILDNLLEGYDNRLRPGFGGAVTEVKT
DIYVTSFGPVSDVEMEYTMDVFFRQTWTDERLKFKGPAEILSLNNLMVSKIWTPDTFFRN
GKKSIAHNMTTPNKLFRLMHNGTILYTMRLTINADCPMRLVNFPMDGHACPLKFGSYAYP
KSEIIYTWKKGPLYSVEVPEESSSLLQYDLIGQTVSSETIKSNTGEYVIMTVYFHLQRKM
GYFMIQIYTPCIMTVILSQVSFWINKESVPARTVFGITTVLTMTTLSISARHSLPKVSYA
TAMDWFIAVCFAFVFSALIEFAAVNYFTNLQSQKAERQAQTAAKPPVAKSKTTESLEAEI
VVHSDSKYHLKKRISSLTLPIVPSSEASKVLSRTPILPSTPVTPPLLLPAIGGTSKIDQY
SRILFPVAFAGFNLVYWIVYLSKDTMEVSSTVE

Sequence of entity 4 (D), FASTA

>9OUP_4 Gamma-aminobutyric acid receptor subunit gamma-2 (chains D)
MSSPNTWSTGSTVYSPVFSQKMTLWILLLLSLYPGFTSQKSDDDYEDYASNKTWVLTPKV
PEGDVTVILNNLLEGYDNKLRPDIGVKPTLIHTDMYVNSIGPVNAINMEYTIDIFFAQTW
YDRRLKFNSTIKVLRLNSNMVGKIWIPDTFFRNSKKADAHWITTPNRMLRIWNDGRVLYT
LRLTIDAECQLQLHNFPMDEHSCPLEFSSYGYPREEIVYQWKRSSVEVGDTRSWRLYQFS
FVGLRNTTEVVKTTSGDYVVMSVYFDLSRRMGYFTIQTYIPCTLIVVLSWVSFWINKDAV
PARTSLGITTVLTMTTLSTIARKSLPKVSYVTAMDLFVSVCFIFVFSALVEYGTLHYFVS
NRKPSKDKDKKKKNPAPTIDIRPRSATIQMNNATHLQERDEEYGYECLDGKDCASFFCCF
EDCRTGAWRHGRIHIRIAKMDSYARIFFPTAFCLFNLVYWVSYLYL

Sequence of entity 5 (E), FASTA

>9OUP_5 Gamma-aminobutyric acid receptor subunit beta-2 (chains E)
MWRVRKRGYFGIWSFPLIIAAVCAQSVNDPSNMSLVKETVDRLLKGYDIRLRPDFGGPPV
AVGMNIDIASIDMVSEVNMDYTLTMYFQQAWRDKRLSYNVIPLNLTLDNRVADQLWVPDT
YFLNDKKSFVHGVTVKNRMIRLHPDGTVLYGLRITTTAACMMDLRRYPLDEQNCTLEIES
YGYTTDDIEFYWRGDDNAVTGVTKIELPQFSIVDYKLITKKVVFSTGSYPRLSLSFKLKR
NIGYFILQTYMPSILITILSWVSFWINYDASAARVALGITTVLTMTTINTHLRETLPKIP
YVKAIDMYLMGCFVFVFMALLEYALVNYIFFGRGPQRQKKAAEKAANANNEKMRLDVNKM
DPHENILLSTLEIKNEMATSEAVMGLGDPRSTMLAYDASSIQYRKAGLPRHSFGRNALER
HVAQKKSRLRRRASQLKITIPDLTDVNAIDRWSRIFFPVVFSFFNIVYWLYYVN

Sequence of entity 6 (H), FASTA

>9OUP_6 8E3 fab heavy chain (chains H)
EIQLQQSGPELVKPGTSVKVSCKASGYSFTDYNMYWVKQSHGKSLEWIGYIDPYNADTTY
NREFKGKATLTVDKSSSTAFMHLNSLTSEDSAVYYCARKRNNFYFDYWGQGTPLTVSSAK
TTPPSVYPLAPGCGDTTGSSVTLGCLVKGYFPESVTVTWNSGSLSSSVHTFPALLQSGLY
TMSSSVTVPSSTWPSQTVTCSVAHPASSTTVDKKSAALEVLFQ

Sequence of entity 7 (L), FASTA

>9OUP_7 8E3 fab light chain (chains L)
YIVMTQSPKSMSMSLGERVTLSCRASEYVGSYVSWYQQKPEQSPKLLIYGASNRYTGVPD
RFAGSGSATDFTLTITSVQAEDLADYHCGQTYNYPTFGGGTKLEIKRADAAPTVSIFPPS
SEQLTSGGASVVCFLNNFYPKDINVKWKIDGSERQNGVLNSWTDQDSKDSTYSMSSTLTL
TKDEYERHNSYTCEATHKTSTSPIVKSFNRNEC

Ligands and cofactors

ID	Name	Formula	Copies
NAG	2-acetamido-2-deoxy-beta-D-glucopyranose	C8 H15 N O6	1
ABU	Gamma-amino-butanoic acid	C4 H9 N O2	2

Primary citation

Molecular assemblies and pharmacology of cerebellar GABA A receptors. Sun, C., Jahncke, J.N., Wright, K.M. et al. Proc Natl Acad Sci U S A (2026) 123:e2524504123-e2524504123. DOI 10.1073/pnas.2524504123 · PubMed

Other PDB entries of the same protein (UniProt P62813 (AlphaFold model), which also has an AlphaFold model), best resolution first:

9OUN 2.74 Å, Native GABA-A receptor from rat cerebella, beta2-alpha1-beta2-alpha1-gamma2 subtype, in…
9OUR 2.84 Å, Native GABA-A receptor from rat cerebella, beta2-alpha1-beta2-alpha1-gamma2 subtype, in…
9OUQ 2.89 Å, Native GABA-A receptor from rat cerebella, beta1-alpha1-beta2-alpha1-gamma2 subtype, in…
9OUM 2.9 Å, Native GABA-A receptor from rat cerebella, beta2-alpha1-beta1-alpha6-gamma2 subtype, in…
9OUO 2.92 Å, Native GABA-A receptor from rat cerebella, beta1-alpha1-beta1-alpha1-gamma2 subtype, in…
9OV4 2.93 Å, Native GABA-A receptor from rat cerebella, beta1-alpha1-beta2-alpha1-gamma2 subtype, in…
6DW1 3.1 Å, Cryo-EM structure of the benzodiazepine-sensitive alpha1beta1gamma2S tri-heteromeric…
6DW0 3.8 Å, Cryo-EM structure of the benzodiazepine-sensitive alpha1beta1gamma2S tri-heteromeric…

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