SAXSdb — 1ic2

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

TROPOMYOSIN ALPHA CHAIN, SKELETAL MUSCLE

Gallus gallus

State in the Current Structure

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

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	TPM1_CHICK
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–81； UniProt 1–81 Author chain B； PDBConstruct 1–81； UniProt 1–81 Author chain C； PDBConstruct 1–81； UniProt 1–81 Author chain D； PDBConstruct 1–81； UniProt 1–81

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	1ic2
Deposition date deposition_date	2001-03-29
Structure title title	DECIPHERING THE DESIGN OF THE TROPOMYOSIN MOLECULE
Keywords keywords	alpha-helical coiled coil, alanine, symmetry, axial stagger, bend, CONTRACTILE PROTEIN; CONTRACTILE 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.

1ic2__assembly_1__model_1

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

Download this curve (.dat)

1ic2__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

1ic2__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	31.86 Å
Rg (electron density)	34.31 Å
Total Rg	34.30 Å
Atom count	1246
Residues	156
Excluded volume	22284 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`1ic2__assembly_1__model_1`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download
2	1	`1ic2__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)

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6. Fold Classification (SCOP + CATH) 8 domains

SCOP 2.08 (4 domains)

Domain ID domain_id	d1ic2a_
Class class	h — Coiled coil proteins
Fold Fold fold	h.1 — Parallel coiled-coil
Superfamily Superfamily superfamily	h.1.5 — Tropomyosin
Family Family family	h.1.5.1 — Tropomyosin

Domain ID domain_id	d1ic2b_
Class class	h — Coiled coil proteins
Fold Fold fold	h.1 — Parallel coiled-coil
Superfamily Superfamily superfamily	h.1.5 — Tropomyosin
Family Family family	h.1.5.1 — Tropomyosin

Domain ID domain_id	d1ic2c_
Class class	h — Coiled coil proteins
Fold Fold fold	h.1 — Parallel coiled-coil
Superfamily Superfamily superfamily	h.1.5 — Tropomyosin
Family Family family	h.1.5.1 — Tropomyosin

Domain ID domain_id	d1ic2d_
Class class	h — Coiled coil proteins
Fold Fold fold	h.1 — Parallel coiled-coil
Superfamily Superfamily superfamily	h.1.5 — Tropomyosin
Family Family family	h.1.5.1 — Tropomyosin

CATH v4.4 (4 domains)

Domain ID domain_id	1ic2A00
Class class	1 — Mainly Alpha
Architecture architecture	20 — Up-down Bundle
Topology topology	5 — Single alpha-helices involved in coiled-coils or other helix-helix interfaces
Homologous superfamily homologous superfamily	340 —

Domain ID domain_id	1ic2B00
Class class	1 — Mainly Alpha
Architecture architecture	20 — Up-down Bundle
Topology topology	5 — Single alpha-helices involved in coiled-coils or other helix-helix interfaces
Homologous superfamily homologous superfamily	340 —

Domain ID domain_id	1ic2C00
Class class	1 — Mainly Alpha
Architecture architecture	20 — Up-down Bundle
Topology topology	5 — Single alpha-helices involved in coiled-coils or other helix-helix interfaces
Homologous superfamily homologous superfamily	340 —

Domain ID domain_id	1ic2D00
Class class	1 — Mainly Alpha
Architecture architecture	20 — Up-down Bundle
Topology topology	5 — Single alpha-helices involved in coiled-coils or other helix-helix interfaces
Homologous superfamily homologous superfamily	340 —

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Unit-cell length a length_a	41.400 Å
Unit-cell length b length_b	45.500 Å
Unit-cell length c length_c	56.300 Å
Unit-cell angle α angle_alpha	93.70 °
Unit-cell angle β angle_beta	98.10 °
Unit-cell angle γ angle_gamma	104.40 °
Molecules per unit cell Z z_pdb	4

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

Resolution resolution	2.000 Å
Low-resolution limit resolution_low	50.000 Å
R factor r_factor	—
R_work r_work	0.2488
R_free r_free	0.2835

Description description	TROPOMYOSIN ALPHA CHAIN, SKELETAL MUSCLE
Molecular weight formula_weight	9273.5 kDa
Mutation mutation	A81S
Source method src_method	man
Copy count entity_count	4

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B,C,D
Atom count atom_count	2670

DECIPHERING THE DESIGN OF THE TROPOMYOSIN MOLECULE

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

TROPOMYOSIN ALPHA CHAIN, SKELETAL MUSCLE

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

1ic2__assembly_1__model_1

1ic2__assembly_1__model_1 | I(q)

1ic2__assembly_1__model_1 | P(r) · Pending

4. Crystallography and Experiment 4. Crystallography & Experiment

Unit cell Unit Cell

Symmetry Symmetry

Refinement Refinement

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) 8 domains

SCOP 2.08 (4 domains)

CATH v4.4 (4 domains)

7. Citations (5)

Source organism organism	Gallus gallus
Common name common_name	chicken
NCBI taxonomy ID ncbi_taxonomy_id	9031
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	178

DECIPHERING THE DESIGN OF THE TROPOMYOSIN MOLECULE

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

TROPOMYOSIN ALPHA CHAIN, SKELETAL MUSCLE

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

1ic2__assembly_1__model_1

1ic2__assembly_1__model_1 | I(q)

1ic2__assembly_1__model_1 | P(r) · Pending

4. Crystallography and Experiment 4. Crystallography & Experiment

Unit cell Unit Cell

Symmetry Symmetry

Refinement Refinement

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) 8 domains

SCOP 2.08 (4 domains)

CATH v4.4 (4 domains)

7. Citations (5)