SAXSdb — 2ccz

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

PRIMOSOMAL REPLICATION PROTEIN N

ESCHERICHIA COLI

State in the Current Structure

Assembly	Oligomeric State	Construct	Mutations and Modifications	Ligands, Ions and Associated Components	Method and Experimental Conditions	Structure Quality
1	Protein–DNA Homooligomer Protein × 2 DNA 1 PDB declaration: trimeric（3） Consistent with all polymer counts	Chain A； UniProt 1–103 Chain B； UniProt 1–103	Mutation：YES	;5'-D(TPTPTPTPTPTPTPTPTPTP TPTPTPTP*T)-3' ; × 1	X-RAY DIFFRACTION X-ray crystallization conditions：pH 6.5；pH 6.50	Resolution 2.70 Å R-free 0.284

Other States of the Same Protein in the Database

Each row is a biological assembly of the same UniProt protein in another PDB entry. The “Difference from current entry” column identifies evidence-level differences; no tag means the currently parsed fields agree.

Other PDB	Difference from Current Entry 2CCZ	Assembly / Oligomeric State	Construct	Mutations and Modifications	Ligands, Ions and Non-polymers	Method and Experimental Conditions	Structure Quality
1TXY E. coli PriB Deposited 2004-07-06	Different mutation/modification Different oligomeric state Different experimental conditions Different structure-quality metrics	Assembly 1 Protein homooligomer Homooligomer；Protein × 2 PDB declaration: dimeric	Chain A 1–103（103 aa） Chain B 1–103（103 aa）	Non-standard monomer：Yes (specific site not provided by mmCIF) Non-standard monomer：Yes (specific site not provided by mmCIF)	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 8.5；298 K；PEG 8000, Tris-HCl, pH 8.5, VAPOR DIFFUSION, HANGING DROP, temperature 298K	Resolution 2.00 Å R-free 0.285
1V1Q Crystal structure of PriB- a primosomal DNA replication protein of Escherichia coli Deposited 2004-04-22	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein homooligomer Homooligomer；Protein × 2 PDB declaration: dimeric	Chain A 1–104（104 aa） Chain B 1–104（104 aa）	Mutation：YES Mutation：YES	CYS CYSTEINE × 3	X-RAY DIFFRACTION X-ray crystallization conditions pH 5.7；pH 5.70	Resolution 2.10 Å R-free 0.263
1WOC Crystal structure of PriB Deposited 2004-08-13	Different construct Different mutation/modification Different oligomeric state Different experimental conditions Different structure-quality metrics	Assembly 1 Protein homooligomer Homooligomer；Protein × 4 PDB declaration: tetrameric	Chain A 1–103（103 aa） Chain B 1–103（103 aa） Chain C 1–103（103 aa） Chain D 1–103（103 aa）	Non-standard monomer：Yes (specific site not provided by mmCIF) Non-standard monomer：Yes (specific site not provided by mmCIF) Non-standard monomer：Yes (specific site not provided by mmCIF) Non-standard monomer：Yes (specific site not provided by mmCIF)	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 8；298 K；25%(v/v) MPD, 50mM Magnesium Chloride, 100mM Tris-HCl, pH 8.0, VAPOR DIFFUSION, HANGING DROP, temperature 298K	Resolution 2.00 Å R-free 0.276
1WOC Crystal structure of PriB Deposited 2004-08-13	Different mutation/modification Different oligomeric state Different experimental conditions Different structure-quality metrics	Assembly 2 Protein homooligomer Homooligomer；Protein × 2 PDB declaration: dimeric	Chain A 1–103（103 aa） Chain D 1–103（103 aa）	Non-standard monomer：Yes (specific site not provided by mmCIF) Non-standard monomer：Yes (specific site not provided by mmCIF)	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 8；298 K；25%(v/v) MPD, 50mM Magnesium Chloride, 100mM Tris-HCl, pH 8.0, VAPOR DIFFUSION, HANGING DROP, temperature 298K	Resolution 2.00 Å R-free 0.276
1WOC Crystal structure of PriB Deposited 2004-08-13	Different mutation/modification Different oligomeric state Different experimental conditions Different structure-quality metrics	Assembly 3 Protein homooligomer Homooligomer；Protein × 2 PDB declaration: dimeric	Chain B 1–103（103 aa） Chain C 1–103（103 aa）	Non-standard monomer：Yes (specific site not provided by mmCIF) Non-standard monomer：Yes (specific site not provided by mmCIF)	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 8；298 K；25%(v/v) MPD, 50mM Magnesium Chloride, 100mM Tris-HCl, pH 8.0, VAPOR DIFFUSION, HANGING DROP, temperature 298K	Resolution 2.00 Å R-free 0.276
2PNH Escherichia coli PriB E39A variant Deposited 2007-04-24	Different construct Different mutation/modification Different oligomeric state Different experimental conditions Different structure-quality metrics	Assembly 1 Protein homooligomer Homooligomer；Protein × 2 PDB declaration: dimeric	Chain A 1–104（104 aa） Chain B 1–104（104 aa）	Mutation：E39A Mutation：E39A	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 8.5；298 K；8% polyethylene glycol 8000, pH 8.5, VAPOR DIFFUSION, HANGING DROP, temperature 298K	Resolution 2.25 Å R-free 0.276
8FAK DNA replication fork binding triggers structural changes in the PriA DNA helicase that regulate the PriA-PriB replication restart pathway in E. coli Deposited 2022-11-28	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 1 Protein–DNA Heteromer；Protein × 3 PDB declaration: hexameric	Chain A 1–104（104 aa） Chain B 1–104（104 aa）	Not recorded	ZN ZINC ION × 2	ELECTRON MICROSCOPY cryo-EM buffer pH 8 cryo-EM vitrification conditions Cryogen ETHANE	Resolution 3.22 Å
9ZBT Visualization of PriA/PriB/DnaT complexes reveals mechanisms governing structure-specific assembly of the DNA replication restart primosome Deposited 2025-11-21	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 1 Protein–DNA Heteromer；Protein × 4 PDB declaration: heptameric	Chain A 1–104（104 aa） Chain B 1–104（104 aa）	Not recorded	ZN ZINC ION × 2	ELECTRON MICROSCOPY cryo-EM buffer pH 8；50 mM Tris-HCl, pH 8, 2 mM dithiothreitol, 5 mM ethylenediaminetetraacetic acid, 75 mM NaCl cryo-EM vitrification conditions Cryogen ETHANE	Resolution 3.22 Å
9ZBU Visualization of PriA/PriB/DnaT complexes reveals mechanisms governing structure-specific assembly of the DNA replication restart primosome Deposited 2025-11-21	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 1 Protein–DNA Heteromer；Protein × 10 PDB declaration: tridecameric	Chain A 2–100（99 aa） Chain B 2–100（99 aa）	Not recorded	ZN ZINC ION × 2	ELECTRON MICROSCOPY cryo-EM buffer pH 8；50 mM Tris-HCl, pH 8, 2 mM dithiothreitol, 5 mM ethylenediaminetetraacetic acid, 75 mM NaCl cryo-EM vitrification conditions Cryogen ETHANE	Resolution 3.60 Å

7 other PDB entries and 9 assemblies. Open the comparison page and filter oligomeric states

View Construct and Data Evidence

UniProt name	PRIB_ECOLI
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 8–110； UniProt 1–103 Author chain B； PDBConstruct 8–110； UniProt 1–103

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	2ccz
Deposition date deposition_date	2006-01-19
Structure title title	Crystal structure of E. coli primosomol protein PriB bound to ssDNA
Keywords keywords	;DNA/REPLICATION, PRIMOSOME, PRIB, DNA REPLICATION, DNA REPAIR, DNA RECOMBINATION, SSDNA, SINGLE-STRANDED DNA, DNA-PROTEIN COMPLEX, DNA-REPLICATION complex ;; DNA/REPLICATION
Experimental Method method	X-RAY DIFFRACTION

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3. SAXS Parameters (CRYSOL theoretical calculation) 3. SAXS Parameters (CRYSOL)

Radius of gyration Rg (Guinier) rg_guinier	21.43 Å
Radius of gyration Rg (electron density) rg_electron	20.41 Å
Forward intensity I(0) i0	19611300.00
Molecular weight molecular_weight	29650.0 kDa
Excluded volume excluded_volume	35556 Å³
Envelope volume envelope_volume	48011 Å³
Hydration-shell volume shell_volume	20238 Å³
Envelope diameter envelope_diameter	89.0 Å
Shell Rg shell_rg	26.28 Å
Envelope Rg envelope_rg	21.08 Å
Shape Rg shape_rg	20.50 Å
Total Rg total_rg	20.99 Å
Total atoms total_atoms	2060
Residues n_residues	256
Spherical-harmonic order n_harmonics	20
q range q_range	— – 0.5000 Å⁻¹
Data points n_points	101
Shell type shell_type	directional
Solvent electron density solvent_density	0.3340 e/Å³
Shell contrast contrast_shell	0.0300 e/Å³
CRYSOL version crysol_version	4.1.3

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4. P(r) Distance Distribution (GNOM inversion) 4. P(r) Analysis (GNOM)

Maximum dimension Dmax dmax	83.9 Å
Rg (real space) rg_real	21.45 Å
Rg uncertainty (real space) rg_real_error	0.85 Å
I(0) (real space) i0_real	1.9610e+07
I(0) uncertainty (real space) i0_real_error	3.0990e+05
Rg (reciprocal space) rg_reciprocal	21.45 Å
I(0) (reciprocal space) i0_reciprocal	19610000.0000
Solution quality estimate total_estimate	0.7100
Solution quality rating solution_quality	REASONABLE a REASONABLE solution
P(r) peaks n_peaks	3
Primary peak position r_peak_primary	25.9 Å
Skewness Skewness skewness	0.469
Kurtosis Kurtosis kurtosis	0.204
Angular range angular_range	— – 0.3700 Å⁻¹
Current regularization parameter α current_alpha	0.0000
Highest regularization parameter α highest_alpha	3955000.0000
Real-space data points n_real_points	69
GNOM version gnom_version	4.1.3
Quality Criteria quality_criteria	AN1: 0.000; Oscil: 0.475; Stabil: 1.000; Sysdev: 1.000; Positv: 1.000; Valcen: 0.800; Smooth: 0.000

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5. Crystallography and Experiment 5. Crystallography & Experiment

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6. Entities and Polymers Entities & Polymers (3)

Entity 1 Entity 1 polymer

Description description	PRIMOSOMAL REPLICATION PROTEIN N
Molecular weight formula_weight	13685.7 kDa
Mutation mutation	YES
Source method src_method	man
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B
Atom count atom_count	2179

MDPNSLMTNRLVLSGTVCRAPLRKVSPSGIPHCQFVLEHRSVQEEAGFHRQAWCQMPVIVSGHENQAITHSITVGSRITVQGFISCHKAKNGLSKMVLHAEQIELIDSVDKLAAALEHHHHHH

来源 Source

来源生物 organism	ESCHERICHIA COLI
NCBI Class编号 ncbi_taxonomy_id	83333
宿主生物 host_organism	ESCHERICHIA COLI

Entity 2 Entity 2 polymer

Description description	;5'-D(TPTPTPTPTPTPTPTPTPTP TPTPTPTP*T)-3' ;
Molecular weight formula_weight	4517.9 kDa
Source method src_method	syn
Copy count entity_count	1

Polymer Polymer

Polymer type type	polydeoxyribonucleotide
Chain IDs strand_id	C

TTTTTTTTTTTTTTT

Entity 3 Entity 3 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	119

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7. Fold Classification (SCOP + CATH) 6 domains

SCOP 2.08 (4 domains)

Domain ID domain_id	d2ccza2
Class class	b — All beta proteins
Fold Fold fold	b.40 — OB-fold
Superfamily Superfamily superfamily	b.40.4 — Nucleic acid-binding proteins
Family Family family	b.40.4.3 — Single strand DNA-binding domain, SSB

Domain ID domain_id	d2ccza3
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	d2cczb2
Class class	b — All beta proteins
Fold Fold fold	b.40 — OB-fold
Superfamily Superfamily superfamily	b.40.4 — Nucleic acid-binding proteins
Family Family family	b.40.4.3 — Single strand DNA-binding domain, SSB

Domain ID domain_id	d2cczb3
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 (2 domains)

Domain ID domain_id	2cczA00
Class class	2 — Mainly Beta
Architecture architecture	40 — Beta Barrel
Topology topology	50 — OB fold (Dihydrolipoamide Acetyltransferase, E2P)
Homologous superfamily homologous superfamily	140 — Nucleic acid-binding proteins

Domain ID domain_id	2cczB00
Class class	2 — Mainly Beta
Architecture architecture	40 — Beta Barrel
Topology topology	50 — OB fold (Dihydrolipoamide Acetyltransferase, E2P)
Homologous superfamily homologous superfamily	140 — Nucleic acid-binding proteins

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8. Citations (1)

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Unit-cell length a length_a	45.537 Å
Unit-cell length b length_b	51.148 Å
Unit-cell length c length_c	99.096 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	8

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

Resolution resolution	2.700 Å
Low-resolution limit resolution_low	17.600 Å
R factor r_factor	0.2500
R_work r_work	0.2500
R_free r_free	0.2840

fit	/app/data/saxs_computation/cc/2ccz/2ccz.fit
pddf	/app/data/pr_computation/cc/2ccz/2ccz.pr.out
profile	/app/data/saxs_computation/cc/2ccz/2ccz.dat

Crystal structure of E. coli primosomol protein PriB bound to ssDNA

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

PRIMOSOMAL REPLICATION PROTEIN N

State in the Current Structure

Other States of the Same Protein in the Database

SAXS scattering curve SAXS Profile

P(r) Distance Distribution P(r) Distribution

2. Structure Basics 2. Structure Basics

3. SAXS Parameters (CRYSOL theoretical calculation) 3. SAXS Parameters (CRYSOL)

4. P(r) Distance Distribution (GNOM inversion) 4. P(r) Analysis (GNOM)

5. Crystallography and Experiment 5. Crystallography & Experiment

Unit cell Unit Cell

Symmetry Symmetry

Refinement Refinement

Diffraction experiment Diffraction

6. Entities and Polymers Entities & Polymers (3)

Entity 1 Entity 1 polymer

Polymer Polymer

来源 Source

Entity 2 Entity 2 polymer

Polymer Polymer

Entity 3 Entity 3 water

7. Fold Classification (SCOP + CATH) 6 domains

SCOP 2.08 (4 domains)

CATH v4.4 (2 domains)

8. Citations (1)

9. Files and Curves (10)

Files (7)

Curves (3)