SAXSdb — 5kj8

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

Vesicle-associated membrane protein 3

Rattus norvegicus

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 5	Syntaxin-1A × 1 （P32851） Synaptosomal-associated protein 25 × 1 （P60881） Synaptosomal-associated protein 25 × 1 （P60881） Synaptotagmin-1 × 1 （P21707） CALCIUM ION × 6	Consistent with protein count
3	Protein heterocomplex	Heteromer	Protein 5	Syntaxin-1A × 1 （P32851） Synaptosomal-associated protein 25 × 1 （P60881） Synaptosomal-associated protein 25 × 1 （P60881） Synaptotagmin-1 × 1 （P21707） CALCIUM ION × 4	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	VAMP3_RAT
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–63； UniProt 14–76 Author chain G； PDBConstruct 1–63； UniProt 14–76

Syntaxin-1A

Rattus norvegicus

UniProt P32851

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 5	Vesicle-associated membrane protein 3 × 1 （P63025） Synaptosomal-associated protein 25 × 1 （P60881） Synaptosomal-associated protein 25 × 1 （P60881） Synaptotagmin-1 × 1 （P21707） CALCIUM ION × 6	Consistent with protein count
3	Protein heterocomplex	Heteromer	Protein 5	Vesicle-associated membrane protein 3 × 1 （P63025） Synaptosomal-associated protein 25 × 1 （P60881） Synaptosomal-associated protein 25 × 1 （P60881） Synaptotagmin-1 × 1 （P21707） CALCIUM ION × 4	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	STX1A_RAT
Isoform	—
PDB entities	2
Chains and sequence ranges	Author chain B； PDBConstruct 1–66； UniProt 191–256 Author chain H； PDBConstruct 1–66； UniProt 191–256

Synaptosomal-associated protein 25

Rattus norvegicus

UniProt P60881

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 5	Vesicle-associated membrane protein 3 × 1 （P63025） Syntaxin-1A × 1 （P32851） Synaptotagmin-1 × 1 （P21707） CALCIUM ION × 6	Consistent with protein count
3	Protein heterocomplex	Heteromer	Protein 5	Vesicle-associated membrane protein 3 × 1 （P63025） Syntaxin-1A × 1 （P32851） Synaptotagmin-1 × 1 （P21707） CALCIUM ION × 4	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	SNP25_RAT
Isoform	P60881-2
PDB entities	3, 4
Chains and sequence ranges	Author chain C； PDBConstruct 1–75； UniProt 9–83 Author chain I； PDBConstruct 1–75； UniProt 9–83 Author chain D； PDBConstruct 1–64； UniProt 141–204 Author chain J； PDBConstruct 1–64； UniProt 141–204

Synaptotagmin-1

Rattus norvegicus

UniProt P21707

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 5	Vesicle-associated membrane protein 3 × 1 （P63025） Syntaxin-1A × 1 （P32851） Synaptosomal-associated protein 25 × 1 （P60881） Synaptosomal-associated protein 25 × 1 （P60881） CALCIUM ION × 6	Consistent with protein count
2	Protein monomer	Monomer	Protein 1	CALCIUM ION × 4	Consistent with protein count
3	Protein heterocomplex	Heteromer	Protein 5	Vesicle-associated membrane protein 3 × 1 （P63025） Syntaxin-1A × 1 （P32851） Synaptosomal-associated protein 25 × 1 （P60881） Synaptosomal-associated protein 25 × 1 （P60881） CALCIUM ION × 4	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	SYT1_RAT
Isoform	—
PDB entities	5
Chains and sequence ranges	Author chain E； PDBConstruct 1–279； UniProt 141–419 Author chain F； PDBConstruct 1–279； UniProt 141–419 Author chain K； PDBConstruct 1–279； UniProt 141–419

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	5kj8
Deposition date deposition_date	2016-06-17
Structure title title	Structure of the Ca2+-bound synaptotagmin-1 SNARE complex (long unit cell form) - from synchrotron diffraction
Keywords keywords	XFEL STRUCTURE, SYNAPTIC FUSION COMPLEX, SYNAPTOTAGMIN1, NEURONAL SNARE COMPLEX, ENDOCYTOSIS, EXOCYTOSIS; ENDOCYTOSIS,EXOCYTOSIS
Experimental Method method	X-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.

5kj8__assembly_1__model_1

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

Download this curve (.dat)

5kj8__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

5kj8__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	33.56 Å
Rg (electron density)	33.55 Å
Total Rg	33.60 Å
Atom count	4244
Residues	545
Excluded volume	74987 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`5kj8__assembly_1__model_1`	pentameric （5）	Success	4.1.3-1-20251215 (887e7ef)	View Download
2	1	`5kj8__assembly_2__model_1`	monomeric （1）	Success	4.1.3-1-20251215 (887e7ef)	View Download
3	1	`5kj8__assembly_3__model_1`	pentameric （5）	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 (6)

Entity 1 Entity 1 polymer

Description description	Vesicle-associated membrane protein 3
Molecular weight formula_weight	7231.1 kDa
Source method src_method	man
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,G
Atom count atom_count	10515

GSNRRLQQTQAQVDEVVDIMRVNVDKVLERDQKLSELDDRADALQAGASQFETSAAKLKRKYW

Source Source

Source organism organism	Rattus norvegicus
Common name common_name	Rat
NCBI taxonomy ID ncbi_taxonomy_id	10116
Host organism host_organism	Escherichia coli

Entity 2 Entity 2 polymer

Description description	Syntaxin-1A
Molecular weight formula_weight	7706.8 kDa
Source method src_method	man
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	B,H

ALSEIETRHSEIIKLENSIRELHDMFMDMAMLVESQGEMIDRIEYNVEHAVDYVERAVSDTKKAVK

Source Source

Source organism organism	Rattus norvegicus
Common name common_name	Rat
NCBI taxonomy ID ncbi_taxonomy_id	10116
Host organism host_organism	Escherichia coli

Entity 3 Entity 3 polymer

Description description	Synaptosomal-associated protein 25
Molecular weight formula_weight	8741.7 kDa
Source method src_method	man
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	C,I

NELEEMQRRADQLADESLESTRRMLQLVEESKDAGIRTLVMLDEQGEQLDRVEEGMNHINQDMKEAEKNLKDLGK

Source Source

Source organism organism	Rattus norvegicus
Common name common_name	Rat
NCBI taxonomy ID ncbi_taxonomy_id	10116
Host organism host_organism	Escherichia coli

Entity 4 Entity 4 polymer

Description description	Synaptosomal-associated protein 25
Molecular weight formula_weight	7340.2 kDa
Source method src_method	man
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	D,J

ARENEMDENLEQVSGIIGNLRHMALDMGNEIDTQNRQIDRIMEKADSNKTRIDEANQRATKMLG

Source Source

Source organism organism	Rattus norvegicus
Common name common_name	Rat
NCBI taxonomy ID ncbi_taxonomy_id	10116
Host organism host_organism	Escherichia coli

Entity 5 Entity 5 polymer

Description description	Synaptotagmin-1
Molecular weight formula_weight	31988.8 kDa
Source method src_method	man
Copy count entity_count	3

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	E,F,K

KLGKLQYSLDYDFQNNQLLVGIIQAAELPALDMGGTSDPYVKVFLLPDKKKKFETKVHRKTLNPVFNEQFTFKVPYSELGGKTLVMAVYDFDRFSKHDIIGEFKVPMNTVDFGHVTEEWRDLQSAEKEEQEKLGDICFSLRYVPTAGKLTVVILEAKNLKKMDVGGLSDPYVKIHLMQNGKRLKKKKTTIKKNTLNPYYNESFSFEVPFEQIQKVQVVVTVLDYDKIGKNDAIGKVFVGYNSTGAELRHWSDMLANPRRPIAQWHTLQVEEEVDAMLAV

Source Source

Source organism organism	Rattus norvegicus
Common name common_name	Rat
NCBI taxonomy ID ncbi_taxonomy_id	10116
Host organism host_organism	Escherichia coli

Entity 6 Entity 6 non-polymer

Description description	CALCIUM ION
Molecular weight formula_weight	40.1 kDa
Source method src_method	syn
Copy count entity_count	14

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Unit-cell length a length_a	68.790 Å
Unit-cell length b length_b	169.710 Å
Unit-cell length c length_c	286.790 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	12

Space group space_group	P 21 21 21
Space-group number int_tables_number	19
Crystal system crystal_system	—

Resolution resolution	4.100 Å
Low-resolution limit resolution_low	49.640 Å
R factor r_factor	0.2840
R_work r_work	0.2830
R_free r_free	0.2970

Structure of the Ca2+-bound synaptotagmin-1 SNARE complex (long unit cell form) - from synchrotron diffraction

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

Vesicle-associated membrane protein 3

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

Syntaxin-1A

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

Synaptosomal-associated protein 25

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

Synaptotagmin-1

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

5kj8__assembly_1__model_1

5kj8__assembly_1__model_1 | I(q)

5kj8__assembly_1__model_1 | P(r) · Pending

4. Crystallography and Experiment 4. Crystallography & Experiment

Unit cell Unit Cell

Symmetry Symmetry

Refinement Refinement

Diffraction experiment Diffraction

5. Entities and Polymers Entities & Polymers (6)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 polymer

Polymer Polymer

Source Source

Entity 3 Entity 3 polymer

Polymer Polymer

Source Source

Entity 4 Entity 4 polymer

Polymer Polymer

Source Source

Entity 5 Entity 5 polymer

Polymer Polymer

Source Source

Entity 6 Entity 6 non-polymer

7. Citations (1)