SAXSdb — 1no1

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

replisome organizer

Bacillus phage SPP1

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
3	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	Q38151_BPSPP
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–126； UniProt 1–126 Author chain B； PDBConstruct 1–126； UniProt 1–126 Author chain C； PDBConstruct 1–126； UniProt 1–126

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	1no1
Deposition date deposition_date	2003-01-15
Structure title title	Structure of truncated variant of B.subtilis SPP1 phage G39P helicase loader/inhibitor protein
Keywords keywords	helical; bipartite; natively unfolded domain, replication; REPLICATION
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.

1no1__assembly_2__model_1

Assembly 2 · Model 1 · CRYSOL 4.1.3-1-20251215 (887e7ef)

Download this curve (.dat)

1no1__assembly_2__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

1no1__assembly_2__model_1 | P(r) · Pending

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

Rg（Guinier）	12.70 Å
Rg (electron density)	11.24 Å
Total Rg	12.66 Å
Atom count	509
Residues	65
Excluded volume	9192 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`1no1__assembly_1__model_1`	monomeric （1）	Success	4.1.3-1-20251215 (887e7ef)	View Download
2	1	`1no1__assembly_2__model_1`	monomeric （1）	Success	4.1.3-1-20251215 (887e7ef)	View Download
3	1	`1no1__assembly_3__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) 9 domains

SCOP 2.08 (6 domains)

Domain ID domain_id	d1no1a1
Class class	a — All alpha proteins
Fold Fold fold	a.179 — Replisome organizer (g39p helicase loader/inhibitor protein)
Superfamily Superfamily superfamily	a.179.1 — Replisome organizer (g39p helicase loader/inhibitor protein)
Family Family family	a.179.1.1 — Replisome organizer (g39p helicase loader/inhibitor protein)

Domain ID domain_id	d1no1a2
Class class	l — Artifacts
Fold Fold fold	l.1 — Tags
Superfamily Superfamily superfamily	l.1.1 — Tags
Family Family family	l.1.1.1 — Tags

Domain ID domain_id	d1no1b1
Class class	a — All alpha proteins
Fold Fold fold	a.179 — Replisome organizer (g39p helicase loader/inhibitor protein)
Superfamily Superfamily superfamily	a.179.1 — Replisome organizer (g39p helicase loader/inhibitor protein)
Family Family family	a.179.1.1 — Replisome organizer (g39p helicase loader/inhibitor protein)

Domain ID domain_id	d1no1b2
Class class	l — Artifacts
Fold Fold fold	l.1 — Tags
Superfamily Superfamily superfamily	l.1.1 — Tags
Family Family family	l.1.1.1 — Tags

Domain ID domain_id	d1no1c1
Class class	a — All alpha proteins
Fold Fold fold	a.179 — Replisome organizer (g39p helicase loader/inhibitor protein)
Superfamily Superfamily superfamily	a.179.1 — Replisome organizer (g39p helicase loader/inhibitor protein)
Family Family family	a.179.1.1 — Replisome organizer (g39p helicase loader/inhibitor protein)

Domain ID domain_id	d1no1c2
Class class	l — Artifacts
Fold Fold fold	l.1 — Tags
Superfamily Superfamily superfamily	l.1.1 — Tags
Family Family family	l.1.1.1 — Tags

CATH v4.4 (3 domains)

Domain ID domain_id	1no1A00
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	8 — Helicase, Ruva Protein; domain 3
Homologous superfamily homologous superfamily	200 — Replisome organizer (g39p helicase loader/inhibitor protein)

Domain ID domain_id	1no1B00
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	8 — Helicase, Ruva Protein; domain 3
Homologous superfamily homologous superfamily	200 — Replisome organizer (g39p helicase loader/inhibitor protein)

Domain ID domain_id	1no1C00
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	8 — Helicase, Ruva Protein; domain 3
Homologous superfamily homologous superfamily	200 — Replisome organizer (g39p helicase loader/inhibitor protein)

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Unit-cell length a length_a	88.900 Å
Unit-cell length b length_b	91.300 Å
Unit-cell length c length_c	48.400 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	12

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

Resolution resolution	2.400 Å
Low-resolution limit resolution_low	15.000 Å
R factor r_factor	0.2056
R_work r_work	0.2043
R_free r_free	0.2323

Description description	replisome organizer
Molecular weight formula_weight	14818.0 kDa
Source method src_method	man
Copy count entity_count	3

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B,C
Atom count atom_count	1579

Structure of truncated variant of B.subtilis SPP1 phage G39P helicase loader/inhibitor protein

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

replisome organizer

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

1no1__assembly_2__model_1

1no1__assembly_2__model_1 | I(q)

1no1__assembly_2__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) 9 domains

SCOP 2.08 (6 domains)

CATH v4.4 (3 domains)

7. Citations (1)

Source organism organism	Bacillus phage SPP1
NCBI taxonomy ID ncbi_taxonomy_id	10724
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	41

Structure of truncated variant of B.subtilis SPP1 phage G39P helicase loader/inhibitor protein

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

replisome organizer

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

1no1__assembly_2__model_1

1no1__assembly_2__model_1 | I(q)

1no1__assembly_2__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) 9 domains

SCOP 2.08 (6 domains)

CATH v4.4 (3 domains)

7. Citations (1)