9ffo

Cryo-EM structure of the alpha1beta3 GABA(A) receptor in complex with GABA and Mb25 in the short-lived asymmetric bound-closed 2 state of branch 1

Method: ELECTRON MICROSCOPY

▼

1. Protein Identity and Related Structures Protein Identity & Related Structures

Gamma-aminobutyric acid receptor subunit alpha-1

Homo sapiens

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Other combination	Heteromer	Protein 6 其他Polymer 8	Gamma-aminobutyric acid receptor subunit beta-3 × 3 （P28472） Megabody25,Outer membrane protein × 1 （B5Z8H1） ;alpha-D-mannopyranose-(1-3)-[alpha-D-mannopyranose-(1-6)]beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose ; × 5 2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose × 3 (2S)-3-(hexadecanoyloxy)-2-[(9Z)-octadec-9-enoyloxy]propyl 2-(trimethylammonio)ethyl phosphate × 1 GAMMA-AMINO-BUTANOIC ACID × 2 DECANE × 2	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	GBRA1_HUMAN
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 58–365； UniProt 32–339 Author chain A； PDBConstruct 373–411； UniProt 418–456 Author chain D； PDBConstruct 58–365； UniProt 32–339 Author chain D； PDBConstruct 373–411； UniProt 418–456

Gamma-aminobutyric acid receptor subunit beta-3

Homo sapiens

UniProt P28472

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Other combination	Heteromer	Protein 6 其他Polymer 8	Gamma-aminobutyric acid receptor subunit alpha-1 × 2 （P14867） Megabody25,Outer membrane protein × 1 （B5Z8H1） ;alpha-D-mannopyranose-(1-3)-[alpha-D-mannopyranose-(1-6)]beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose ; × 5 2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose × 3 (2S)-3-(hexadecanoyloxy)-2-[(9Z)-octadec-9-enoyloxy]propyl 2-(trimethylammonio)ethyl phosphate × 1 GAMMA-AMINO-BUTANOIC ACID × 2 DECANE × 2	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	GBRB3_HUMAN
Isoform	—
PDB entities	2
Chains and sequence ranges	Author chain B； PDBConstruct 55–361； UniProt 26–332 Author chain B； PDBConstruct 369–395； UniProt 447–473 Author chain C； PDBConstruct 55–361； UniProt 26–332 Author chain C； PDBConstruct 369–395； UniProt 447–473 Author chain E； PDBConstruct 55–361； UniProt 26–332 Author chain E； PDBConstruct 369–395； UniProt 447–473

Megabody25,Outer membrane protein

Lama glama

UniProt B5Z8H1

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Other combination	Heteromer	Protein 6 其他Polymer 8	Gamma-aminobutyric acid receptor subunit alpha-1 × 2 （P14867） Gamma-aminobutyric acid receptor subunit beta-3 × 3 （P28472） ;alpha-D-mannopyranose-(1-3)-[alpha-D-mannopyranose-(1-6)]beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose ; × 5 2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose × 3 (2S)-3-(hexadecanoyloxy)-2-[(9Z)-octadec-9-enoyloxy]propyl 2-(trimethylammonio)ethyl phosphate × 1 GAMMA-AMINO-BUTANOIC ACID × 2 DECANE × 2	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	B5Z8H1_HELPG
Isoform	—
PDB entities	3
Chains and sequence ranges	Author chain F； PDBConstruct 13–233； UniProt 226–446 Author chain F； PDBConstruct 234–402； UniProt 53–221

The page prioritizes protein identity, the current assembly, associated components, oligomeric state and cross-PDB links. Chain mapping and sequence ranges are retained as data evidence. Internal IDs, import timestamps and assembly operation expressions are maintenance fields and are not shown here.

▼

2. Structure Basics 2. Structure Basics

Entry ID entry_id	9ffo
Deposition date deposition_date	2024-05-23
Structure title title	Cryo-EM structure of the alpha1beta3 GABA(A) receptor in complex with GABA and Mb25 in the short-lived asymmetric bound-closed 2 state of branch 1
Keywords keywords	GABA, neurotransmission, gating cycle, time-resolved cryo-EM, MEMBRANE PROTEIN; MEMBRANE PROTEIN
Experimental Method method	ELECTRON MICROSCOPY

▼

3. Official assembly/model SAXS Official SAXS Profiles

This page reads only the latest assembly calculations. Every curve maps to an explicit PDB entry, official biological assembly and coordinate model.

9ffo__assembly_1__model_1

Assembly 1 · Model 1 · CRYSOL 4.1.3-1-20251215 (887e7ef)

Download this curve (.dat)

9ffo__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

9ffo__assembly_1__model_1 | P(r) · Pending

P(r) will be calculated and displayed separately for the same assembly/model.

Rg（Guinier）	39.30 Å
Rg (electron density)	38.91 Å
Total Rg	39.22 Å
Atom count	14984
Residues	1784
Excluded volume	270220 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`9ffo__assembly_1__model_1`	hexameric （6）	Success	4.1.3-1-20251215 (887e7ef)	View Download

▶

4. Crystallography and Experiment 4. Crystallography & Experiment

▶

5. Entities and Polymers Entities & Polymers (8)

Entity 1 Entity 1 polymer

Description description	Gamma-aminobutyric acid receptor subunit alpha-1
Molecular weight formula_weight	47059.6 kDa
Source method src_method	man
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	D,A
Atom count atom_count	15019

MDEKTTGWRGGHVVEGLAGELEQLRARLEHHPQGQREPDYDIPTTENLYFQGTGQPSQDELKDNTTVFTRILDRLLDGYDNRLRPGLGERVTEVKTDIFVTSFGPVSDHDMEYTIDVFFRQSWKDERLKFKGPMTVLRLNNLMASKIWTPDTFFHNGKKSVAHNMTMPNKLLRITEDGTLLYTMRLTVRAECPMHLEDFPMDAHACPLKFGSYAYTRAEVVYEWTREPARSVVVAEDGSRLNQYDLLGQTVDSGIVQSSTGEYVVMTTHFHLKRKIGYFVIQTYLPCIMTVILSQVSFWLNRESVPARTVFGVTTVLTMTTLSISARNSLPKVAYATAMDWFIAVCYAFVFSALIEFATVNYFTKSQPARAAKIDRLSRIAFPLLFGIFNLVYWATYLNREPQLKAPTPHQ

Source Source

Source organism organism	Homo sapiens
Common name common_name	human
NCBI taxonomy ID ncbi_taxonomy_id	9606
Host organism host_organism	Homo sapiens

Entity 2 Entity 2 polymer

Description description	Gamma-aminobutyric acid receptor subunit beta-3
Molecular weight formula_weight	45643.2 kDa
Source method src_method	man
Copy count entity_count	3

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	E,B,C

MDEKTTGWRGGHVVEGLAGELEQLRARLEHHPQGQREPDYDIPTTENLYFQGTGQSVNDPGNMSFVKETVDKLLKGYDIRLRPDFGGPPVCVGMNIDIASIDMVSEVNMDYTLTMYFQQYWRDKRLAYSGIPLNLTLDNRVADQLWVPDTYFLNDKKSFVHGVTVKNRMIRLHPDGTVLYGLRITTTAACMMDLRRYPLDEQNCTLEIESYGYTTDDIEFYWRGGDKAVTGVERIELPQFSIVEHRLVSRNVVFATGAYPRLSLSFRLKRNIGYFILQTYMPSILITILSWVSFWINYDASAARVALGITTVLTMTTINTHLRETLPKIPYVKAIDMYLMGCFVFVFLALLEYAFVNYIFFSQPARAAAIDRWSRIVFPFTFSLFNLVYWLYYVN

Source Source

Source organism organism	Homo sapiens
Common name common_name	human
NCBI taxonomy ID ncbi_taxonomy_id	9606
Host organism host_organism	Homo sapiens

Entity 3 Entity 3 polymer

Description description	Megabody25,Outer membrane protein
Molecular weight formula_weight	56300.6 kDa
Source method src_method	man
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	F

QVQLVESGGGLVQTKTTTSVIDTTNDAQNLLTQAQTIVNTLKDYCPILIAKSSSSNGGTNNANTPSWQTAGGGKNSCATFGAEFSAASDMINNAQKIVQETQQLSANQPKNITQPHNLNLNSPSSLTALAQKMLKNAQSQAEILKLANQVESDFNKLSSGHLKDYIGKCDASAISSANMTMQNQKNNWGNGCAGVEETQSLLKTSAADFNNQTPQINQAQNLANTLIQELGNNTYEQLSRLLTNDNGTNSKTSAQAINQAVNNLNERAKTLAGGTTNSPAYQATLLALRSVLGLWNSMGYAVICGGYTKSPGENNQKDFHYTDENGNGTTINCGGSTNSNGTHSYNGTNTLKADKNVSLSIEQYEKIHEAYQILSKALKQAGLAPLNSKGEKLEAHVTTSKYGSLRLSCAASGHTFNYPIMGWFRQAPGKEREFVGAISWSGGSTSYADSVKDRFTISRDNAKNTVYLEMNNLKPEDTAVYYCAAKGRYSGGLYYPTNYDYWGQGTQVTVSSHHHHHHEPEA

Source Source

Source organism organism	Lama glama
NCBI taxonomy ID ncbi_taxonomy_id	9844
Host organism host_organism	Escherichia coli

Entity 4 Entity 4 branched

Description description	;alpha-D-mannopyranose-(1-3)-[alpha-D-mannopyranose-(1-6)]beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose ;
Molecular weight formula_weight	910.8 kDa
Source method src_method	man
Copy count entity_count	5

Entity 5 Entity 5 branched

Description description	2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose
Molecular weight formula_weight	424.4 kDa
Source method src_method	man
Copy count entity_count	3

Entity 6 Entity 6 non-polymer

Description description	(2S)-3-(hexadecanoyloxy)-2-[(9Z)-octadec-9-enoyloxy]propyl 2-(trimethylammonio)ethyl phosphate
Molecular weight formula_weight	760.1 kDa
Source method src_method	syn
Copy count entity_count	1

Entity 7 Entity 7 non-polymer

Description description	GAMMA-AMINO-BUTANOIC ACID
Molecular weight formula_weight	103.1 kDa
Source method src_method	syn
Copy count entity_count	2

Entity 8 Entity 8 non-polymer

Description description	DECANE
Molecular weight formula_weight	142.3 kDa
Source method src_method	syn
Copy count entity_count	2

▶

Unit-cell length a length_a	1.000 Å
Unit-cell length b length_b	1.000 Å
Unit-cell length c length_c	1.000 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	90.00 °
Unit-cell angle γ angle_gamma	90.00 °
Molecules per unit cell Z z_pdb	—

Space group space_group	P 1
Space-group number int_tables_number	1
Crystal system crystal_system	—

Resolution resolution	3.20 Å
Resolution测定Method resolution_method	—
颗粒数 num_particles	56000

Cryo-EM structure of the alpha1beta3 GABA(A) receptor in complex with GABA and Mb25 in the short-lived asymmetric bound-closed 2 state of branch 1

1. Protein Identity and Related Structures Protein Identity & Related Structures

Gamma-aminobutyric acid receptor subunit alpha-1

State in the Current Structure

Other States of the Same Protein in the Database

Gamma-aminobutyric acid receptor subunit beta-3

State in the Current Structure

Other States of the Same Protein in the Database

Megabody25,Outer membrane protein

State in the Current Structure

Other States of the Same Protein in the Database

2. Structure Basics 2. Structure Basics

3. Official assembly/model SAXS Official SAXS Profiles

9ffo__assembly_1__model_1

9ffo__assembly_1__model_1 | I(q)

9ffo__assembly_1__model_1 | P(r) · Pending

4. Crystallography and Experiment 4. Crystallography & Experiment

Unit cell Unit Cell

Symmetry Symmetry

冷冻电镜 EM 3D

5. Entities and Polymers Entities & Polymers (8)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 polymer

Polymer Polymer

Source Source

Entity 3 Entity 3 polymer

Polymer Polymer

Source Source

Entity 4 Entity 4 branched

Entity 5 Entity 5 branched

Entity 6 Entity 6 non-polymer

Entity 7 Entity 7 non-polymer

Entity 8 Entity 8 non-polymer

7. Citations (1)

Cryo-EM structure of the alpha1beta3 GABA(A) receptor in complex with GABA and Mb25 in the short-lived asymmetric bound-closed 2 state of branch 1

1. Protein Identity and Related Structures Protein Identity & Related Structures

Gamma-aminobutyric acid receptor subunit alpha-1

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

Gamma-aminobutyric acid receptor subunit beta-3

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

Megabody25,Outer membrane protein

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

2. Structure Basics 2. Structure Basics

3. Official assembly/model SAXS Official SAXS Profiles

9ffo__assembly_1__model_1

9ffo__assembly_1__model_1 | I(q)

9ffo__assembly_1__model_1 | P(r) · Pending

4. Crystallography and Experiment 4. Crystallography & Experiment

Unit cell Unit Cell

Symmetry Symmetry

冷冻电镜 EM 3D

5. Entities and Polymers Entities & Polymers (8)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 polymer

Polymer Polymer

Source Source

Entity 3 Entity 3 polymer

Polymer Polymer

Source Source

Entity 4 Entity 4 branched

Entity 5 Entity 5 branched

Entity 6 Entity 6 non-polymer

Entity 7 Entity 7 non-polymer

Entity 8 Entity 8 non-polymer

7. Citations (1)