2csd
Crystal structure of Topoisomerase V (61 kDa fragment)
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 monomer | Monomer | 1 / 0 / 0 / 0 | Consistent with protein count |
| 2 | Protein monomer | Monomer | 1 / 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 | 2csd |
| Deposition date deposition_date | 2005-05-21 |
| Structure title title | Crystal structure of Topoisomerase V (61 kDa fragment) |
| Keywords keywords | topoisomerase IB, topoisomerase V, helix-turn-helix, helix-hairpin-helix, HhH motif, three helix bundle, ISOMERASE; ISOMERASE |
| 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.
2csd__assembly_1__model_1
Assembly 1 · Model 1 · CRYSOL 4.1.3-1-20251215 (887e7ef)
2csd__assembly_1__model_1 | I(q)
2csd__assembly_1__model_1 | P(r) · Pending
| Rg（Guinier） | 26.52 Å |
| Rg (electron density) | 25.45 Å |
| Total Rg | 26.25 Å |
| Atom count | 4195 |
| Residues | 516 |
| Excluded volume | 74282 ų |
| Maximum q | 0.500 Å⁻¹ |
4. Crystallography and Experiment 4. Crystallography & Experiment
5. Entities and Polymers Entities & Polymers (1)
6. Fold Classification (SCOP + CATH) 12 domains
SCOP 2.08 (10 domains)
| Domain ID domain_id | d2csda1 |
| Class class | a — All alpha proteins |
| Fold Fold fold | a.267 — Topoisomerase V catalytic domain-like |
| Superfamily Superfamily superfamily | a.267.1 — Topoisomerase V catalytic domain-like |
| Family Family family | a.267.1.1 — Topoisomerase V catalytic domain-like |
| Domain ID domain_id | d2csda2 |
| Class class | a — All alpha proteins |
| Fold Fold fold | a.60 — SAM domain-like |
| Superfamily Superfamily superfamily | a.60.2 — RuvA domain 2-like |
| Family Family family | a.60.2.4 — Topoisomerase V repeat domain |
| Domain ID domain_id | d2csda3 |
| Class class | a — All alpha proteins |
| Fold Fold fold | a.60 — SAM domain-like |
| Superfamily Superfamily superfamily | a.60.2 — RuvA domain 2-like |
| Family Family family | a.60.2.4 — Topoisomerase V repeat domain |
| Domain ID domain_id | d2csda4 |
| Class class | a — All alpha proteins |
| Fold Fold fold | a.60 — SAM domain-like |
| Superfamily Superfamily superfamily | a.60.2 — RuvA domain 2-like |
| Family Family family | a.60.2.4 — Topoisomerase V repeat domain |
| Domain ID domain_id | d2csda5 |
| Class class | a — All alpha proteins |
| Fold Fold fold | a.60 — SAM domain-like |
| Superfamily Superfamily superfamily | a.60.2 — RuvA domain 2-like |
| Family Family family | a.60.2.4 — Topoisomerase V repeat domain |
| Domain ID domain_id | d2csdb1 |
| Class class | a — All alpha proteins |
| Fold Fold fold | a.267 — Topoisomerase V catalytic domain-like |
| Superfamily Superfamily superfamily | a.267.1 — Topoisomerase V catalytic domain-like |
| Family Family family | a.267.1.1 — Topoisomerase V catalytic domain-like |
| Domain ID domain_id | d2csdb2 |
| Class class | a — All alpha proteins |
| Fold Fold fold | a.60 — SAM domain-like |
| Superfamily Superfamily superfamily | a.60.2 — RuvA domain 2-like |
| Family Family family | a.60.2.4 — Topoisomerase V repeat domain |
| Domain ID domain_id | d2csdb3 |
| Class class | a — All alpha proteins |
| Fold Fold fold | a.60 — SAM domain-like |
| Superfamily Superfamily superfamily | a.60.2 — RuvA domain 2-like |
| Family Family family | a.60.2.4 — Topoisomerase V repeat domain |
| Domain ID domain_id | d2csdb4 |
| Class class | a — All alpha proteins |
| Fold Fold fold | a.60 — SAM domain-like |
| Superfamily Superfamily superfamily | a.60.2 — RuvA domain 2-like |
| Family Family family | a.60.2.4 — Topoisomerase V repeat domain |
| Domain ID domain_id | d2csdb5 |
| Class class | a — All alpha proteins |
| Fold Fold fold | a.60 — SAM domain-like |
| Superfamily Superfamily superfamily | a.60.2 — RuvA domain 2-like |
| Family Family family | a.60.2.4 — Topoisomerase V repeat domain |
CATH v4.4 (2 domains)
| Domain ID domain_id | 2csdA02 |
| Class class | 6 — Special |
| Architecture architecture | 10 — Helix non-globular |
| Topology topology | 250 — Single alpha-helices involved in coiled-coils or other helix-helix interfaces |
| Homologous superfamily homologous superfamily | 950 — |
| Domain ID domain_id | 2csdB02 |
| Class class | 6 — Special |
| Architecture architecture | 10 — Helix non-globular |
| Topology topology | 250 — Single alpha-helices involved in coiled-coils or other helix-helix interfaces |
| Homologous superfamily homologous superfamily | 950 — |