SAXSdb — 3fdw

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

Synaptotagmin-like protein 4

Homo sapiens

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein monomer	Monomer	Protein 1	water × 1	Consistent with protein count
2	Protein monomer	Monomer	Protein 1	water × 1	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	SYTL4_HUMAN
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 4–140； UniProt 352–488 Author chain B； PDBConstruct 4–140； UniProt 352–488

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	3fdw
Deposition date deposition_date	2008-11-26
Structure title title	Crystal structure of a C2 domain from human synaptotagmin-like protein 4
Keywords keywords	;STRUCTURAL GENOMICS, PHOSPHOLIPID BINDING, Alternative splicing, Cell membrane, Cytoplasmic vesicle, Membrane, Metal-binding, Phosphoprotein, Polymorphism, Zinc, Zinc-finger, PSI-2, Protein Structure Initiative, New York SGX Research Center for Structural Genomics, NYSGXRC, LIPID BINDING PROTEIN ;; LIPID BINDING PROTEIN
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.

3fdw__assembly_1__model_1

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

Download this curve (.dat)

3fdw__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

3fdw__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	16.13 Å
Rg (electron density)	14.96 Å
Total Rg	16.01 Å
Atom count	1037
Residues	130
Excluded volume	18376 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`3fdw__assembly_1__model_1`	monomeric （1）	Success	4.1.3-1-20251215 (887e7ef)	View Download
2	1	`3fdw__assembly_2__model_1`	monomeric （1）	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)

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6. Fold Classification (SCOP + CATH) 4 domains

SCOP 2.08 (2 domains)

Domain ID domain_id	d3fdwa_
Class class	b — All beta proteins
Fold Fold fold	b.7 — C2 domain-like
Superfamily Superfamily superfamily	b.7.1 — C2 domain (Calcium/lipid-binding domain, CaLB)
Family Family family	b.7.1.0 — automated matches

Domain ID domain_id	d3fdwb_
Class class	b — All beta proteins
Fold Fold fold	b.7 — C2 domain-like
Superfamily Superfamily superfamily	b.7.1 — C2 domain (Calcium/lipid-binding domain, CaLB)
Family Family family	b.7.1.0 — automated matches

CATH v4.4 (2 domains)

Domain ID domain_id	3fdwA00
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	150 — C2 domain

Domain ID domain_id	3fdwB00
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	150 — C2 domain

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Unit-cell length a length_a	25.461 Å
Unit-cell length b length_b	57.207 Å
Unit-cell length c length_c	124.083 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	90.01 °
Unit-cell angle γ angle_gamma	90.00 °
Molecules per unit cell Z z_pdb	4

Space group space_group	P 1 21 1
Space-group number int_tables_number	4
Crystal system crystal_system	—

Resolution resolution	2.200 Å
Low-resolution limit resolution_low	20.000 Å
R factor r_factor	0.2360
R_work r_work	0.2330
R_free r_free	0.2800

Description description	Synaptotagmin-like protein 4
Molecular weight formula_weight	17293.7 kDa
Source method src_method	man
Copy count entity_count	2

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B
Atom count atom_count	2208

Crystal structure of a C2 domain from human synaptotagmin-like protein 4

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

Synaptotagmin-like protein 4

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

3fdw__assembly_1__model_1

3fdw__assembly_1__model_1 | I(q)

3fdw__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 water

6. Fold Classification (SCOP + CATH) 4 domains

SCOP 2.08 (2 domains)

CATH v4.4 (2 domains)

7. Citations (1)

Source organism organism	Homo sapiens
Common name common_name	human
NCBI taxonomy ID ncbi_taxonomy_id	9606
Host organism host_organism	Escherichia coli

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	134

Crystal structure of a C2 domain from human synaptotagmin-like protein 4

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

Synaptotagmin-like protein 4

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

3fdw__assembly_1__model_1

3fdw__assembly_1__model_1 | I(q)

3fdw__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 water

6. Fold Classification (SCOP + CATH) 4 domains

SCOP 2.08 (2 domains)

CATH v4.4 (2 domains)

7. Citations (1)