SAXSdb — 3puj

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

Syntaxin-binding protein 1

Rattus norvegicus

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 2	Syntaxin-4 N-terminal peptide × 1 （P70452）	Consistent with protein count
2	Protein heterocomplex	Heteromer	Protein 2	Syntaxin-4 N-terminal peptide × 1 （P70452）	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	STXB1_RAT
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–594； UniProt 1–594 Author chain B； PDBConstruct 1–594； UniProt 1–594

Syntaxin-4 N-terminal peptide

OrganismNot specified

UniProt P70452

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 2	Syntaxin-binding protein 1 × 1 （P61765）	Consistent with protein count
2	Protein heterocomplex	Heteromer	Protein 2	Syntaxin-binding protein 1 × 1 （P61765）	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	STX4_MOUSE
Isoform	—
PDB entities	2
Chains and sequence ranges	Author chain C； PDBConstruct 1–10； UniProt 1–10 Author chain D； PDBConstruct 1–10； UniProt 1–10

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	3puj
Deposition date deposition_date	2010-12-05
Structure title title	Crystal structure of the MUNC18-1 and SYNTAXIN4 N-Peptide complex
Keywords keywords	MEMBRANE TRAFFICKING, SM PROTEIN, SYNTAXIN, SNARE PROTEINS, Syntaxin binding protein, ENDOCYTOSIS-EXOCYTOSIS complex; 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.

3puj__assembly_1__model_1

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

Download this curve (.dat)

3puj__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

3puj__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	26.52 Å
Rg (electron density)	25.52 Å
Total Rg	26.38 Å
Atom count	4321
Residues	542
Excluded volume	77644 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`3puj__assembly_1__model_1`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download
2	1	`3puj__assembly_2__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 (2)

Entity 1 Entity 1 polymer

Description description	Syntaxin-binding protein 1
Molecular weight formula_weight	67665.7 kDa
Source method src_method	man
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B
Atom count atom_count	8638

MAPIGLKAVVGEKIMHDVIKKVKKKGEWKVLVVDQLSMRMLSSCCKMTDIMTEGITIVEDINKRREPLPSLEAVYLITPSEKSVHSLISDFKDPPTAKYRAAHVFFTDSCPDALFNELVKSRAAKVIKTLTEINIAFLPYESQVYSLDSADSFQSFYSPHKAQMKNPILERLAEQIATLCATLKEYPAVRYRGEYKDNALLAQLIQDKLDAYKADDPTMGEGPDKARSQLLILDRGFDPSSPVLHELTFQAMSYDLLPIENDVYKYETSGIGEARVKEVLLDEDDDLWIALRHKHIAEVSQEVTRSLKDFSSSKRMNTGEKTTMRDLSQMLKKMPQYQKELSKYSTHLHLAEDCMKHYQGTVDKLCRVEQDLAMGTDAEGEKIKDPMRAIVPILLDANVSTYDKIRIILLYIFLKNGITEENLNKLIQHAQIPPEDSEIITNMAHLGVPIVTDSTLRRRSKPERKERISEQTYQLSRWTPIIKDIMEDTIEDKLDTKHYPYISTRSSASFSTTAVSARYGHWHKNKAPGEYRSGPRLIIFILGGVSLNEMRCAYEVTQANGKWEVLIGSTHILTPQKLLDTLKKLNKTDEEISS

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-4 N-terminal peptide
Molecular weight formula_weight	1345.5 kDa
Source method src_method	syn
Copy count entity_count	2

Polymer Polymer

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

MRDRTHELRQ

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6. Fold Classification (SCOP + CATH) 8 domains

CATH v4.4 (8 domains)

Domain ID domain_id	3pujA01
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	50 — Rossmann fold
Homologous superfamily homologous superfamily	2060 — Sec1/Munc18 (SM) protein, domain 1

Domain ID domain_id	3pujA02
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	50 — Rossmann fold
Homologous superfamily homologous superfamily	1910 — Sec1/Munc18 (SM) protein, domain 2

Domain ID domain_id	3pujA03
Class class	3 — Alpha Beta
Architecture architecture	90 — Alpha-Beta Complex
Topology topology	830 — Syntaxin Binding Protein 1; Chain A, domain 2
Homologous superfamily homologous superfamily	10 — Sec1/Munc18 (SM) protein, domain 3a

Domain ID domain_id	3pujA04
Class class	1 — Mainly Alpha
Architecture architecture	25 — Alpha Horseshoe
Topology topology	40 — Serine Threonine Protein Phosphatase 5, Tetratricopeptide repeat
Homologous superfamily homologous superfamily	60 —

Domain ID domain_id	3pujB01
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	50 — Rossmann fold
Homologous superfamily homologous superfamily	2060 — Sec1/Munc18 (SM) protein, domain 1

Domain ID domain_id	3pujB02
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	50 — Rossmann fold
Homologous superfamily homologous superfamily	1910 — Sec1/Munc18 (SM) protein, domain 2

Domain ID domain_id	3pujB03
Class class	3 — Alpha Beta
Architecture architecture	90 — Alpha-Beta Complex
Topology topology	830 — Syntaxin Binding Protein 1; Chain A, domain 2
Homologous superfamily homologous superfamily	10 — Sec1/Munc18 (SM) protein, domain 3a

Domain ID domain_id	3pujB04
Class class	1 — Mainly Alpha
Architecture architecture	25 — Alpha Horseshoe
Topology topology	40 — Serine Threonine Protein Phosphatase 5, Tetratricopeptide repeat
Homologous superfamily homologous superfamily	60 —

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Unit-cell length a length_a	124.505 Å
Unit-cell length b length_b	124.505 Å
Unit-cell length c length_c	232.976 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	16

Space group space_group	P 41 21 2
Space-group number int_tables_number	92
Crystal system crystal_system	—

Resolution resolution	3.313 Å
Low-resolution limit resolution_low	43.254 Å
R factor r_factor	0.2129
R_work r_work	0.2106
R_free r_free	0.2576

Crystal structure of the MUNC18-1 and SYNTAXIN4 N-Peptide complex

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

Syntaxin-binding protein 1

State in the Current Structure

Other States of the Same Protein in the Database

Syntaxin-4 N-terminal peptide

State in the Current Structure

Other States of the Same Protein in the Database

2. Structure Basics 2. Structure Basics

3. Official assembly/model SAXS Official SAXS Profiles

3puj__assembly_1__model_1

3puj__assembly_1__model_1 | I(q)

3puj__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 (2)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 polymer

Polymer Polymer

6. Fold Classification (SCOP + CATH) 8 domains

CATH v4.4 (8 domains)

7. Citations (1)

Crystal structure of the MUNC18-1 and SYNTAXIN4 N-Peptide complex

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

Syntaxin-binding protein 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

Syntaxin-4 N-terminal peptide

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

3puj__assembly_1__model_1

3puj__assembly_1__model_1 | I(q)

3puj__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 (2)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 polymer

Polymer Polymer

6. Fold Classification (SCOP + CATH) 8 domains

CATH v4.4 (8 domains)

7. Citations (1)