9kps

Cryo-EM structure of Saccharomyces cerevisiae Mitochondrial Respiratory Complex II

Method: ELECTRON MICROSCOPY

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

Succinate dehydrogenase [ubiquinone] flavoprotein subunit, mitochondrial

OrganismNot specified

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 4	Succinate dehydrogenase [ubiquinone] iron-sulfur subunit, mitochondrial × 1 （P21801） Sdh3p × 1 （C7GVH5） Succinate dehydrogenase [ubiquinone] cytochrome b small subunit, mitochondrial × 1 （P37298） FLAVIN-ADENINE DINUCLEOTIDE × 1 FE2/S2 (INORGANIC) CLUSTER × 1 IRON/SULFUR CLUSTER × 1 FE3-S4 CLUSTER × 1 1,2-dioleoyl-sn-glycero-3-phosphoethanolamine × 1	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	SDHA_YEAST
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–593； UniProt 45–637

Succinate dehydrogenase [ubiquinone] iron-sulfur subunit, mitochondrial

OrganismNot specified

UniProt P21801

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 4	Succinate dehydrogenase [ubiquinone] flavoprotein subunit, mitochondrial × 1 （Q00711） Sdh3p × 1 （C7GVH5） Succinate dehydrogenase [ubiquinone] cytochrome b small subunit, mitochondrial × 1 （P37298） FLAVIN-ADENINE DINUCLEOTIDE × 1 FE2/S2 (INORGANIC) CLUSTER × 1 IRON/SULFUR CLUSTER × 1 FE3-S4 CLUSTER × 1 1,2-dioleoyl-sn-glycero-3-phosphoethanolamine × 1	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	SDHB_YEAST
Isoform	—
PDB entities	2
Chains and sequence ranges	Author chain B； PDBConstruct 1–238； UniProt 28–265

Sdh3p

OrganismNot specified

UniProt C7GVH5

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 4	Succinate dehydrogenase [ubiquinone] flavoprotein subunit, mitochondrial × 1 （Q00711） Succinate dehydrogenase [ubiquinone] iron-sulfur subunit, mitochondrial × 1 （P21801） Succinate dehydrogenase [ubiquinone] cytochrome b small subunit, mitochondrial × 1 （P37298） FLAVIN-ADENINE DINUCLEOTIDE × 1 FE2/S2 (INORGANIC) CLUSTER × 1 IRON/SULFUR CLUSTER × 1 FE3-S4 CLUSTER × 1 1,2-dioleoyl-sn-glycero-3-phosphoethanolamine × 1	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	C7GVH5_YEAS2
Isoform	—
PDB entities	3
Chains and sequence ranges	Author chain C； PDBConstruct 1–144； UniProt 55–198

Succinate dehydrogenase [ubiquinone] cytochrome b small subunit, mitochondrial

OrganismNot specified

UniProt P37298

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 4	Succinate dehydrogenase [ubiquinone] flavoprotein subunit, mitochondrial × 1 （Q00711） Succinate dehydrogenase [ubiquinone] iron-sulfur subunit, mitochondrial × 1 （P21801） Sdh3p × 1 （C7GVH5） FLAVIN-ADENINE DINUCLEOTIDE × 1 FE2/S2 (INORGANIC) CLUSTER × 1 IRON/SULFUR CLUSTER × 1 FE3-S4 CLUSTER × 1 1,2-dioleoyl-sn-glycero-3-phosphoethanolamine × 1	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	DHSD_YEAST
Isoform	—
PDB entities	4
Chains and sequence ranges	Author chain D； PDBConstruct 1–134； UniProt 34–167

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.

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2. Structure Basics 2. Structure Basics

Entry ID entry_id	9kps
Deposition date deposition_date	2024-11-24
Structure title title	Cryo-EM structure of Saccharomyces cerevisiae Mitochondrial Respiratory Complex II
Keywords keywords	Complex, mitochondria, ELECTRON TRANSPORT, MEMBRANE PROTEIN; MEMBRANE PROTEIN
Experimental Method method	ELECTRON MICROSCOPY

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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.

9kps__assembly_1__model_1

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

Download this curve (.dat)

9kps__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

9kps__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	33.51 Å
Rg (electron density)	33.79 Å
Total Rg	33.98 Å
Atom count	8809
Residues	1109
Excluded volume	157070 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`9kps__assembly_1__model_1`	tetrameric （4）	Success	4.1.3-1-20251215 (887e7ef)	View Download

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4. Crystallography and Experiment 4. Crystallography & Experiment

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5. Entities and Polymers Entities & Polymers (9)

Entity 1 Entity 1 polymer

Description description	Succinate dehydrogenase [ubiquinone] flavoprotein subunit, mitochondrial
Molecular weight formula_weight	65307.6 kDa
EC 编号 ec_number	1.3.5.1
Source method src_method	nat
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A
Atom count atom_count	8809

KYHIIDHEYDCVVIGAGGAGLRAAFGLAEAGYKTACISKLFPTRSHTVAAQGGINAALGNMHKDNWKWHMYDTVKGSDWLGDQDSIHYMTREAPKSIIELEHYGVPFSRTENGKIYQRAFGGQTKEYGKGAQAYRTCAVADRTGHALLHTLYGQALRHDTHFFIEYFALDLLTHNGEVVGVIAYNQEDGTIHRFRAHKTIIATGGYGRAYFSCTSAHTCTGDGNAMVSRAGFPLQDLEFVQFHPSGIYGSGCLITEGARGEGGFLVNSEGERFMERYAPTAKDLACRDVVSRAITMEIREGRGVGKKKDHMYLQLSHLPPEVLKERLPGISETAAIFAGVDVTKEPIPIIPTVHYNMGGIPTKWNGEALTIDEETGEDKVIPGLMACGEAACVSVHGANRLGANSLLDLVVFGRAVAHTVADTLQPGLPHKPLPSDLGKESIANLDKLRNANGSRSTAEIRMNMKQTMQKDVSVFRTQSSLDEGVRNITAVEKTFDDVKTTDRSMIWNSDLVETLELQNLLTCASQTAVSAANRKESRGAHAREDYPNRDDEHWMKHTLSWQKDVAAPVTLKYRRVIDHTLDEKECPSVPPTV

Entity 2 Entity 2 polymer

Description description	Succinate dehydrogenase [ubiquinone] iron-sulfur subunit, mitochondrial
Molecular weight formula_weight	27332.7 kDa
EC 编号 ec_number	1.3.5.1
Source method src_method	nat
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	B

THTPRLKTFKVYRWNPDEPSAKPHLQSYQVDLNDCGPMVLDALLKIKDEQDSTLTFRRSCREGICGSCAMNIGGRNTLACICKIDQNESKQLKIYPLPHMFIVKDLVPDLTNFYQQYKSIQPYLQRSSFPKDGTEVLQSIEDRKKLDGLYECILCACCSTSCPSYWWNQEQYLGPAVLMQAYRWLIDSRDQATKTRKAMLNNSMSLYRCHTIMNCTRTCPKGLNPGLAIAEIKKSLAF

Entity 3 Entity 3 polymer

Description description	Sdh3p
Molecular weight formula_weight	16396.1 kDa
Source method src_method	nat
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	C

EMNTKAAIAEEQILNKQRARRPISPHLTIYQPQLTWYLSSFHRISLVLMGLGFYLFTILFGVSGLLGLGLTTEKVSNWYHQKFSKITEWSIKGSFAYLFAIHYGGAIRHLIWDTAKELTLKGVYRTGYALIGFTAVLGTYLLTL

Entity 4 Entity 4 polymer

Description description	Succinate dehydrogenase [ubiquinone] cytochrome b small subunit, mitochondrial
Molecular weight formula_weight	14799.1 kDa
Source method src_method	nat
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	D

IPFLPVLPQKPGGVRGTPNDAYVPPPENKLEGSYHWYMEKIFALSVVPLATTAMLTTGPLSTAADSFFSVMLLGYCYMEFNSCITDYISGRVYGVWHKYAMYMLGLGSAVSLFGIYKLETENDGVVGLVKSLWD

Entity 5 Entity 5 non-polymer

Description description	FLAVIN-ADENINE DINUCLEOTIDE
Molecular weight formula_weight	785.5 kDa
Source method src_method	syn
Copy count entity_count	1

Entity 6 Entity 6 non-polymer

Description description	FE2/S2 (INORGANIC) CLUSTER
Molecular weight formula_weight	175.8 kDa
Source method src_method	syn
Copy count entity_count	1

Entity 7 Entity 7 non-polymer

Description description	IRON/SULFUR CLUSTER
Molecular weight formula_weight	351.6 kDa
Source method src_method	syn
Copy count entity_count	1

Entity 8 Entity 8 non-polymer

Description description	FE3-S4 CLUSTER
Molecular weight formula_weight	295.8 kDa
Source method src_method	syn
Copy count entity_count	1

Entity 9 Entity 9 non-polymer

Description description	1,2-dioleoyl-sn-glycero-3-phosphoethanolamine
Molecular weight formula_weight	744.0 kDa
Source method src_method	syn
Copy count entity_count	1

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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	3.360 Å
Low-resolution limit resolution_low	— Å
R factor r_factor	—
R_work r_work	—
R_free r_free	—

Resolution resolution	3.36 Å
Resolution测定Method resolution_method	—
颗粒数 num_particles	79821

Cryo-EM structure of Saccharomyces cerevisiae Mitochondrial Respiratory Complex II

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

Succinate dehydrogenase [ubiquinone] flavoprotein subunit, mitochondrial

State in the Current Structure

Other States of the Same Protein in the Database

Succinate dehydrogenase [ubiquinone] iron-sulfur subunit, mitochondrial

State in the Current Structure

Other States of the Same Protein in the Database

Sdh3p

State in the Current Structure

Other States of the Same Protein in the Database

Succinate dehydrogenase [ubiquinone] cytochrome b small subunit, mitochondrial

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

9kps__assembly_1__model_1

9kps__assembly_1__model_1 | I(q)

9kps__assembly_1__model_1 | P(r) · Pending

4. Crystallography and Experiment 4. Crystallography & Experiment

Unit cell Unit Cell

Symmetry Symmetry

Refinement Refinement

冷冻电镜 EM 3D

5. Entities and Polymers Entities & Polymers (9)

Entity 1 Entity 1 polymer

Polymer Polymer

Entity 2 Entity 2 polymer

Polymer Polymer

Entity 3 Entity 3 polymer

Polymer Polymer

Entity 4 Entity 4 polymer

Polymer Polymer

Entity 5 Entity 5 non-polymer

Entity 6 Entity 6 non-polymer

Entity 7 Entity 7 non-polymer

Entity 8 Entity 8 non-polymer

Entity 9 Entity 9 non-polymer

7. Citations (1)

Cryo-EM structure of Saccharomyces cerevisiae Mitochondrial Respiratory Complex II

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

Succinate dehydrogenase [ubiquinone] flavoprotein subunit, mitochondrial

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

Succinate dehydrogenase [ubiquinone] iron-sulfur subunit, mitochondrial

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

Sdh3p

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

Succinate dehydrogenase [ubiquinone] cytochrome b small subunit, mitochondrial

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

9kps__assembly_1__model_1

9kps__assembly_1__model_1 | I(q)

9kps__assembly_1__model_1 | P(r) · Pending

4. Crystallography and Experiment 4. Crystallography & Experiment

Unit cell Unit Cell

Symmetry Symmetry

Refinement Refinement

冷冻电镜 EM 3D

5. Entities and Polymers Entities & Polymers (9)

Entity 1 Entity 1 polymer

Polymer Polymer

Entity 2 Entity 2 polymer

Polymer Polymer

Entity 3 Entity 3 polymer

Polymer Polymer

Entity 4 Entity 4 polymer

Polymer Polymer

Entity 5 Entity 5 non-polymer

Entity 6 Entity 6 non-polymer

Entity 7 Entity 7 non-polymer

Entity 8 Entity 8 non-polymer

Entity 9 Entity 9 non-polymer

7. Citations (1)