1yq4
Avian respiratory complex ii with 3-nitropropionate and ubiquinone
1. Protein Identity and Related Structures Protein Identity & Related Structures
No usable UniProt protein identity is available for this entry.
The relationship tables retain this entry's assembly and composition data, but cross-PDB links for the same protein cannot be established reliably without a unified protein identity.
Assembly Composition of the Current Entry
| Assembly | Physical composition | Protein state | 蛋白 / DNA / RNA / 其他Polymer | Data consistency |
|---|---|---|---|---|
| 1 | Protein heterocomplex | Heteromer | 4 / 0 / 0 / 0 | Consistent with protein count |
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 | 1yq4 |
| Deposition date deposition_date | 2005-02-01 |
| Structure title title | Avian respiratory complex ii with 3-nitropropionate and ubiquinone |
| Keywords keywords | ;COMPLEX II, MEMBRANE PROTEIN, HEME PROTEIN, IRON SULFUR PROTEIN, CYTOCHROME B, OXIDOREDUCTASE, REDOX ENZYME, RESPIRATORY CHAIN, OXALOACETATE NITROPROPIONATE UBIQUINONE ;; OXIDOREDUCTASE |
| Experimental Method method | X-RAY DIFFRACTION |
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.
1yq4__assembly_1__model_1
Assembly 1 · Model 1 · CRYSOL 4.1.3-1-20251215 (887e7ef)
1yq4__assembly_1__model_1 | I(q)
1yq4__assembly_1__model_1 | P(r) · Pending
| Rg（Guinier） | 32.21 Å |
| Rg (electron density) | 32.95 Å |
| Total Rg | 33.05 Å |
| Atom count | 8716 |
| Residues | 1098 |
| Excluded volume | 155610 ų |
| Maximum q | 0.500 Å⁻¹ |
4. Crystallography and Experiment 4. Crystallography & Experiment
5. Entities and Polymers Entities & Polymers (15)
6. Fold Classification (SCOP + CATH) 13 domains
SCOP 2.08 (4 domains)
| Domain ID domain_id | d1yq4b1 |
| Class class | d — Alpha and beta proteins (a+b) |
| Fold Fold fold | d.15 — beta-Grasp (ubiquitin-like) |
| Superfamily Superfamily superfamily | d.15.4 — 2Fe-2S ferredoxin-like |
| Family Family family | d.15.4.2 — 2Fe-2S ferredoxin domains from multidomain proteins |
| Domain ID domain_id | d1yq4b2 |
| Class class | a — All alpha proteins |
| Fold Fold fold | a.1 — Globin-like |
| Superfamily Superfamily superfamily | a.1.2 — alpha-helical ferredoxin |
| Family Family family | a.1.2.1 — Fumarate reductase/Succinate dehydogenase iron-sulfur protein, C-terminal domain |
| Domain ID domain_id | d1yq4c_ |
| Class class | f — Membrane and cell surface proteins and peptides |
| Fold Fold fold | f.21 — Heme-binding four-helical bundle |
| Superfamily Superfamily superfamily | f.21.2 — Fumarate reductase respiratory complex transmembrane subunits |
| Family Family family | f.21.2.2 — Succinate dehydrogenase/Fumarate reductase transmembrane subunits (SdhC/FrdC and SdhD/FrdD) |
| Domain ID domain_id | d1yq4d_ |
| Class class | f — Membrane and cell surface proteins and peptides |
| Fold Fold fold | f.21 — Heme-binding four-helical bundle |
| Superfamily Superfamily superfamily | f.21.2 — Fumarate reductase respiratory complex transmembrane subunits |
| Family Family family | f.21.2.2 — Succinate dehydrogenase/Fumarate reductase transmembrane subunits (SdhC/FrdC and SdhD/FrdD) |
CATH v4.4 (9 domains)
| Domain ID domain_id | 1yq4A01 |
| Class class | 3 — Alpha Beta |
| Architecture architecture | 50 — 3-Layer(bba) Sandwich |
| Topology topology | 50 — FAD/NAD(P)-binding domain |
| Homologous superfamily homologous superfamily | 60 — FAD/NAD(P)-binding domain |
| Domain ID domain_id | 1yq4A02 |
| Class class | 3 — Alpha Beta |
| Architecture architecture | 90 — Alpha-Beta Complex |
| Topology topology | 700 — Flavocytochrome C3; Chain A, domain 1 |
| Homologous superfamily homologous superfamily | 10 — Succinate dehydrogenase/fumarate reductase flavoprotein, catalytic domain |
| Domain ID domain_id | 1yq4A03 |
| Class class | 1 — Mainly Alpha |
| Architecture architecture | 20 — Up-down Bundle |
| Topology topology | 58 — Methane Monooxygenase Hydroxylase; Chain G, domain 1 |
| Homologous superfamily homologous superfamily | 100 — Fumarate reductase/succinate dehydrogenase flavoprotein-like, C-terminal domain |
| Domain ID domain_id | 1yq4A04 |
| Class class | 4 — Few Secondary Structures |
| Architecture architecture | 10 — Irregular |
| Topology topology | 80 — Rhinovirus 14, subunit 4 |
| Homologous superfamily homologous superfamily | 40 — succinate dehydrogenase protein domain |
| Domain ID domain_id | 1yq4B01 |
| Class class | 3 — Alpha Beta |
| Architecture architecture | 10 — Roll |
| Topology topology | 20 — Ubiquitin-like (UB roll) |
| Homologous superfamily homologous superfamily | 30 — Beta-grasp domain |
| Domain ID domain_id | 1yq4B02 |
| Class class | 1 — Mainly Alpha |
| Architecture architecture | 10 — Orthogonal Bundle |
| Topology topology | 1060 — Fumarate Reductase Iron-sulfur Protein; Chain B, domain 2 |
| Homologous superfamily homologous superfamily | 10 — Alpha-helical ferredoxin |
| Domain ID domain_id | 1yq4C01 |
| Class class | 1 — Mainly Alpha |
| Architecture architecture | 20 — Up-down Bundle |
| Topology topology | 5 — Single alpha-helices involved in coiled-coils or other helix-helix interfaces |
| Homologous superfamily homologous superfamily | 540 — Single helix bin |
| Domain ID domain_id | 1yq4C02 |
| Class class | 1 — Mainly Alpha |
| Architecture architecture | 20 — Up-down Bundle |
| Topology topology | 1300 — 3 helical TM bundles of succinate and fumarate reductases |
| Homologous superfamily homologous superfamily | 10 — Fumarate reductase/succinate dehydrogenase, transmembrane subunit |
| Domain ID domain_id | 1yq4D00 |
| Class class | 1 — Mainly Alpha |
| Architecture architecture | 20 — Up-down Bundle |
| Topology topology | 1300 — 3 helical TM bundles of succinate and fumarate reductases |
| Homologous superfamily homologous superfamily | 10 — Fumarate reductase/succinate dehydrogenase, transmembrane subunit |