SAXSdb — 1l4x

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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	8 / 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.

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2. Structure Basics 2. Structure Basics

Entry ID entry_id	1l4x
Deposition date deposition_date	2002-03-06
Structure title title	Octameric de novo designed peptide
Keywords keywords	coiled coil, protein de novo design, ionic interactions, protein folding, protein oligomerization, DE NOVO PROTEIN; DE NOVO 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.

1l4x__assembly_1__model_1

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

Download this curve (.dat)

1l4x__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

1l4x__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	15.76 Å
Rg (electron density)	13.90 Å
Total Rg	15.12 Å
Atom count	1050
Residues	112
Excluded volume	18599 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`1l4x__assembly_1__model_1`	octameric （8）	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 (4)

Entity 1 Entity 1 polymer

Description description	SIN-ASP-GLU-LEU-GLU-ARG-ALA-ILE-ARG-GLU-LEU-ALA-ALA-ARG-ILE-LYS-NH2
Molecular weight formula_weight	1885.2 kDa
Source method src_method	syn
Copy count entity_count	8

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B,C,D,E,F,G,H
Atom count atom_count	1155

DELERAIRELAARIKX

Entity 2 Entity 2 non-polymer

Description description	CHLORIDE ION
Molecular weight formula_weight	35.5 kDa
Source method src_method	syn
Copy count entity_count	1

Entity 3 Entity 3 non-polymer

Description description	MAGNESIUM ION
Molecular weight formula_weight	24.3 kDa
Source method src_method	syn
Copy count entity_count	1

Entity 4 Entity 4 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	105

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6. Fold Classification (SCOP + CATH) 8 domains

SCOP 2.08 (8 domains)

Domain ID domain_id	d1l4xa_
Class class	k — Designed proteins
Fold Fold fold	k.2 — Amphiphilic (amphipathic) alpha helix
Superfamily Superfamily superfamily	k.2.1 — Amphiphilic (amphipathic) alpha helix
Family Family family	k.2.1.1 — Amphiphilic (amphipathic) alpha helix

Domain ID domain_id	d1l4xb_
Class class	k — Designed proteins
Fold Fold fold	k.2 — Amphiphilic (amphipathic) alpha helix
Superfamily Superfamily superfamily	k.2.1 — Amphiphilic (amphipathic) alpha helix
Family Family family	k.2.1.1 — Amphiphilic (amphipathic) alpha helix

Domain ID domain_id	d1l4xc_
Class class	k — Designed proteins
Fold Fold fold	k.2 — Amphiphilic (amphipathic) alpha helix
Superfamily Superfamily superfamily	k.2.1 — Amphiphilic (amphipathic) alpha helix
Family Family family	k.2.1.1 — Amphiphilic (amphipathic) alpha helix

Domain ID domain_id	d1l4xd_
Class class	k — Designed proteins
Fold Fold fold	k.2 — Amphiphilic (amphipathic) alpha helix
Superfamily Superfamily superfamily	k.2.1 — Amphiphilic (amphipathic) alpha helix
Family Family family	k.2.1.1 — Amphiphilic (amphipathic) alpha helix

Domain ID domain_id	d1l4xe_
Class class	k — Designed proteins
Fold Fold fold	k.2 — Amphiphilic (amphipathic) alpha helix
Superfamily Superfamily superfamily	k.2.1 — Amphiphilic (amphipathic) alpha helix
Family Family family	k.2.1.1 — Amphiphilic (amphipathic) alpha helix

Domain ID domain_id	d1l4xf_
Class class	k — Designed proteins
Fold Fold fold	k.2 — Amphiphilic (amphipathic) alpha helix
Superfamily Superfamily superfamily	k.2.1 — Amphiphilic (amphipathic) alpha helix
Family Family family	k.2.1.1 — Amphiphilic (amphipathic) alpha helix

Domain ID domain_id	d1l4xg_
Class class	k — Designed proteins
Fold Fold fold	k.2 — Amphiphilic (amphipathic) alpha helix
Superfamily Superfamily superfamily	k.2.1 — Amphiphilic (amphipathic) alpha helix
Family Family family	k.2.1.1 — Amphiphilic (amphipathic) alpha helix

Domain ID domain_id	d1l4xh_
Class class	k — Designed proteins
Fold Fold fold	k.2 — Amphiphilic (amphipathic) alpha helix
Superfamily Superfamily superfamily	k.2.1 — Amphiphilic (amphipathic) alpha helix
Family Family family	k.2.1.1 — Amphiphilic (amphipathic) alpha helix

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Unit-cell length a length_a	56.628 Å
Unit-cell length b length_b	56.628 Å
Unit-cell length c length_c	113.869 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	90.00 °
Unit-cell angle γ angle_gamma	120.00 °
Molecules per unit cell Z z_pdb	48

Space group space_group	P 31 2 1
Space-group number int_tables_number	152
Crystal system crystal_system	—

Resolution resolution	2.000 Å
Low-resolution limit resolution_low	30.020 Å
R factor r_factor	—
R_work r_work	0.2420
R_free r_free	0.2780

Octameric de novo designed peptide