2xhe

Crystal structure of the Unc18-syntaxin 1 complex from Monosiga brevicollis

Method: X-RAY DIFFRACTION
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1. Protein Identity and Related Structures Protein Identity & Related Structures

UNC18

MONOSIGA BREVICOLLIS

UniProt A9V0L3

State in the Current Structure

Assembly Physical composition Protein state Molecular copy count Associated components Data consistency
1 Protein heterocomplex Heteromer Protein 2 SYNTAXIN1 × 1 (A9UTG5) water × 2 Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence
UniProt name A9V0L3_MONBE
Isoform —
PDB entities 1
Chains and sequence ranges Author chain A; PDBConstruct 2–650; UniProt 1–649

SYNTAXIN1

MONOSIGA BREVICOLLIS

UniProt A9UTG5

State in the Current Structure

Assembly Physical composition Protein state Molecular copy count Associated components Data consistency
1 Protein heterocomplex Heteromer Protein 2 UNC18 × 1 (A9V0L3) water × 2 Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence
UniProt name A9UTG5_MONBE
Isoform —
PDB entities 2
Chains and sequence ranges Author chain B; PDBConstruct 1–279; UniProt 1–279

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_id2xhe
Deposition date deposition_date2010-06-14
Structure title titleCrystal structure of the Unc18-syntaxin 1 complex from Monosiga brevicollis
Keywords keywordsEXOCYTOSIS, EXOCYTOSIS COMPLEX, SNARE, NEURO FUSION, SM PROTEIN, CHOANOFLAGELLATES; EXOCYTOSIS
Experimental Method methodX-RAY DIFFRACTION
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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.

2xhe__assembly_1__model_1

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

Download this curve (.dat)

2xhe__assembly_1__model_1 | I(q)

10-2 10-1 106 107 108 q (1/Angstrom) I(q)
100 plotted points; both axes use logarithmic scales.

2xhe__assembly_1__model_1 | P(r) · Pending

The new assembly/model P(r) has not been calculated yet This placeholder does not display legacy data r (Angstrom) P(r)
P(r) will be calculated and displayed separately for the same assembly/model.
Rg(Guinier)31.93 Å
Rg (electron density)30.94 Å
Total Rg31.56 Å
Atom count6267
Residues787
Excluded volume111020 ų
Maximum q0.500 Å⁻¹
Assembly Model Structure unit Oligomeric description Status CRYSOL Actions
1 1 2xhe__assembly_1__model_1 dimeric (2) 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 (3)

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6. Fold Classification (SCOP + CATH) 5 domains

CATH v4.4 (5 domains)

Domain ID domain_id2xheA01
Class class3 — Alpha Beta
Architecture architecture40 — 3-Layer(aba) Sandwich
Topology topology50 — Rossmann fold
Homologous superfamily homologous superfamily2060 — Sec1/Munc18 (SM) protein, domain 1
Domain ID domain_id2xheA02
Class class3 — Alpha Beta
Architecture architecture40 — 3-Layer(aba) Sandwich
Topology topology50 — Rossmann fold
Homologous superfamily homologous superfamily1910 — Sec1/Munc18 (SM) protein, domain 2
Domain ID domain_id2xheA03
Class class3 — Alpha Beta
Architecture architecture90 — Alpha-Beta Complex
Topology topology830 — Syntaxin Binding Protein 1; Chain A, domain 2
Homologous superfamily homologous superfamily10 — Sec1/Munc18 (SM) protein, domain 3a
Domain ID domain_id2xheA04
Class class1 — Mainly Alpha
Architecture architecture25 — Alpha Horseshoe
Topology topology40 — Serine Threonine Protein Phosphatase 5, Tetratricopeptide repeat
Homologous superfamily homologous superfamily60 —
Domain ID domain_id2xheB01
Class class1 — Mainly Alpha
Architecture architecture20 — Up-down Bundle
Topology topology58 — Methane Monooxygenase Hydroxylase; Chain G, domain 1
Homologous superfamily homologous superfamily70 —
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7. Citations (1)