SAXSdb — 2bl0

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

MAJOR PLASMODIAL MYOSIN HEAVY CHAIN

PHYSARUM POLYCEPHALUM

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 3	MYOSIN REGULATORY LIGHT CHAIN × 1 （P08053） MYOSIN REGULATORY LIGHT CHAIN × 1 （Q8WSQ4） CALCIUM ION × 2 water × 3	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	Q9BJD3_PHYPO
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–63； UniProt 778–840

MYOSIN REGULATORY LIGHT CHAIN

PHYSARUM POLYCEPHALUM

UniProt P08053

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 3	MAJOR PLASMODIAL MYOSIN HEAVY CHAIN × 1 （Q9BJD3） MYOSIN REGULATORY LIGHT CHAIN × 1 （Q8WSQ4） CALCIUM ION × 2 water × 3	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	MLR_PHYPO
Isoform	—
PDB entities	2
Chains and sequence ranges	Author chain B； PDBConstruct 1–145； UniProt 1–145

MYOSIN REGULATORY LIGHT CHAIN

PHYSARUM POLYCEPHALUM

UniProt Q8WSQ4

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 3	MAJOR PLASMODIAL MYOSIN HEAVY CHAIN × 1 （Q9BJD3） MYOSIN REGULATORY LIGHT CHAIN × 1 （P08053） CALCIUM ION × 2 water × 3	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	Q8WSQ4_PHYPO
Isoform	—
PDB entities	3
Chains and sequence ranges	Author chain C； PDBConstruct 1–142； UniProt 14–155

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	2bl0
Deposition date deposition_date	2005-02-23
Structure title title	Physarum polycephalum myosin II regulatory domain
Keywords keywords	MUSCLE PROTEIN, SLIME MOULD, EF-HAND, MYOSIN; MUSCLE 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.

2bl0__assembly_1__model_1

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

Download this curve (.dat)

2bl0__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

2bl0__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	27.74 Å
Rg (electron density)	27.52 Å
Total Rg	28.10 Å
Atom count	2776
Residues	350
Excluded volume	49423 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`2bl0__assembly_1__model_1`	trimeric （3）	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 (5)

Entity 1 Entity 1 polymer

Description description	MAJOR PLASMODIAL MYOSIN HEAVY CHAIN
Molecular weight formula_weight	7577.9 kDa
EC 编号 ec_number	3.6.1.32
Source method src_method	man
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A
Atom count atom_count	3078

RRIGEIVKVVQAAARGWVERKHFRQAREKSVSARIIQDNIRAYLEFKNWAWWKLFAKARPLLV

Source Source

Source organism organism	PHYSARUM POLYCEPHALUM
NCBI taxonomy ID ncbi_taxonomy_id	5791
Host organism host_organism	ESCHERICIA COLI

Entity 2 Entity 2 polymer

Description description	MYOSIN REGULATORY LIGHT CHAIN
Molecular weight formula_weight	15937.8 kDa
EC 编号 ec_number	3.6.1.32
Source method src_method	man
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	B

TASADQIQECFQIFDKDNDGKVSIEELGSALRSLGKNPTNAELNTIKGQLNAKEFDLATFKTVYRKPIKTPTEQSKEMLDAFRALDKEGNGTIQEAELRQLLLNLGDALTSSEVEELMKEVSVSGDGAINYESFVDMLVTGYPLA

Source Source

Source organism organism	PHYSARUM POLYCEPHALUM
NCBI taxonomy ID ncbi_taxonomy_id	5791
Host organism host_organism	ESCHERICIA COLI

Entity 3 Entity 3 polymer

Description description	MYOSIN REGULATORY LIGHT CHAIN
Molecular weight formula_weight	16195.1 kDa
EC 编号 ec_number	3.6.1.32
Source method src_method	man
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	C

GDDQVSEFKEAFELFDSERTGFITKEGLQTVLKQFGVRVEPAAFNEMFNEADATGNGKIQFPEFLSMMGRRMKQTTSEDILRQAFRTFDPEGTGYIPKAALQDALLNLGDRLKPHEFAEFLGITETEKGQIRYDNFINTMFT

Source Source

Source organism organism	PHYSARUM POLYCEPHALUM
NCBI taxonomy ID ncbi_taxonomy_id	5791
Host organism host_organism	ESCHERICIA COLI

Entity 4 Entity 4 non-polymer

Description description	CALCIUM ION
Molecular weight formula_weight	40.1 kDa
Source method src_method	syn
Copy count entity_count	2

Entity 5 Entity 5 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	230

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6. Fold Classification (SCOP + CATH) 6 domains

SCOP 2.08 (1 domains)

Domain ID domain_id	d2bl0c_
Class class	a — All alpha proteins
Fold Fold fold	a.39 — EF Hand-like
Superfamily Superfamily superfamily	a.39.1 — EF-hand
Family Family family	a.39.1.0 — automated matches

CATH v4.4 (5 domains)

Domain ID domain_id	2bl0A00
Class class	4 — Few Secondary Structures
Architecture architecture	10 — Irregular
Topology topology	270 — Myosin, subunit A
Homologous superfamily homologous superfamily	10 — Myosin, subunit A

Domain ID domain_id	2bl0B01
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	238 — Recoverin; domain 1
Homologous superfamily homologous superfamily	10 — EF-hand

Domain ID domain_id	2bl0B02
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	238 — Recoverin; domain 1
Homologous superfamily homologous superfamily	10 — EF-hand

Domain ID domain_id	2bl0C01
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	238 — Recoverin; domain 1
Homologous superfamily homologous superfamily	10 — EF-hand

Domain ID domain_id	2bl0C02
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	238 — Recoverin; domain 1
Homologous superfamily homologous superfamily	10 — EF-hand

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Unit-cell length a length_a	55.574 Å
Unit-cell length b length_b	70.858 Å
Unit-cell length c length_c	97.877 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	4

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

Resolution resolution	1.750 Å
Low-resolution limit resolution_low	57.740 Å
R factor r_factor	0.2210
R_work r_work	0.2190
R_free r_free	0.2520

Physarum polycephalum myosin II regulatory domain

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

MAJOR PLASMODIAL MYOSIN HEAVY CHAIN

State in the Current Structure

Other States of the Same Protein in the Database

MYOSIN REGULATORY LIGHT CHAIN

State in the Current Structure

Other States of the Same Protein in the Database

MYOSIN REGULATORY LIGHT CHAIN

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

2bl0__assembly_1__model_1

2bl0__assembly_1__model_1 | I(q)

2bl0__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 (5)

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 non-polymer

Entity 5 Entity 5 water

6. Fold Classification (SCOP + CATH) 6 domains

SCOP 2.08 (1 domains)

CATH v4.4 (5 domains)

7. Citations (1)

Physarum polycephalum myosin II regulatory domain

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

MAJOR PLASMODIAL MYOSIN HEAVY CHAIN

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

MYOSIN REGULATORY LIGHT CHAIN

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

MYOSIN REGULATORY LIGHT CHAIN

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

2bl0__assembly_1__model_1

2bl0__assembly_1__model_1 | I(q)

2bl0__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 (5)

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 non-polymer

Entity 5 Entity 5 water

6. Fold Classification (SCOP + CATH) 6 domains

SCOP 2.08 (1 domains)

CATH v4.4 (5 domains)

7. Citations (1)