3cu3
Crystal structure of a domain of unknown function with a cystatin-like fold (npun_r1993) from nostoc punctiforme pcc 73102 at 2.00 A resolution
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 homooligomer | Homooligomer | 2 / 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 | 3cu3 |
| Deposition date deposition_date | 2008-04-15 |
| Structure title title | Crystal structure of a domain of unknown function with a cystatin-like fold (npun_r1993) from nostoc punctiforme pcc 73102 at 2.00 A resolution |
| Keywords keywords | Structural genomics, Joint Center for Structural Genomics, JCSG, Protein Structure Initiative, PSI-2, metal binding protein; METAL BINDING PROTEIN |
| 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.
3cu3__assembly_1__model_1
Assembly 1 · Model 1 · CRYSOL 4.1.3-1-20251215 (887e7ef)
3cu3__assembly_1__model_1 | I(q)
3cu3__assembly_1__model_1 | P(r) · Pending
| Rg（Guinier） | 21.56 Å |
| Rg (electron density) | 20.26 Å |
| Total Rg | 21.11 Å |
| Atom count | 2572 |
| Residues | 320 |
| Excluded volume | 45593 ų |
| Maximum q | 0.500 Å⁻¹ |
4. Crystallography and Experiment 4. Crystallography & Experiment
5. Entities and Polymers Entities & Polymers (5)
6. Fold Classification (SCOP + CATH) 2 domains
SCOP 2.08 (1 domains)
| Domain ID domain_id | d3cu3a1 |
| Class class | d — Alpha and beta proteins (a+b) |
| Fold Fold fold | d.17 — Cystatin-like |
| Superfamily Superfamily superfamily | d.17.4 — NTF2-like |
| Family Family family | d.17.4.28 — BaiE/LinA-like |
CATH v4.4 (1 domains)
| Domain ID domain_id | 3cu3A00 |
| Class class | 3 — Alpha Beta |
| Architecture architecture | 10 — Roll |
| Topology topology | 450 — Nuclear Transport Factor 2; Chain: A, |
| Homologous superfamily homologous superfamily | 50 — |