SAXSdb — 2izo

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

FLAP STRUCTURE-SPECIFIC ENDONUCLEASE

SULFOLOBUS SOLFATARICUS

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 3	DNA POLYMERASE SLIDING CLAMP C × 1 （Q97Z84） DNA POLYMERASE SLIDING CLAMP B × 1 （P57766） ZINC ION × 4 MAGNESIUM ION × 4 water × 3	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	FEN_SULSO
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 2–346； UniProt 5–349

DNA POLYMERASE SLIDING CLAMP C

SULFOLOBUS SOLFATARICUS

UniProt Q97Z84

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 3	FLAP STRUCTURE-SPECIFIC ENDONUCLEASE × 1 （Q980U8） DNA POLYMERASE SLIDING CLAMP B × 1 （P57766） ZINC ION × 4 MAGNESIUM ION × 4 water × 3	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	PCNA3_SULSO
Isoform	—
PDB entities	2
Chains and sequence ranges	Author chain B； PDBConstruct 2–246； UniProt 1–245

DNA POLYMERASE SLIDING CLAMP B

SULFOLOBUS SOLFATARICUS

UniProt P57766

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 3	FLAP STRUCTURE-SPECIFIC ENDONUCLEASE × 1 （Q980U8） DNA POLYMERASE SLIDING CLAMP C × 1 （Q97Z84） ZINC ION × 4 MAGNESIUM ION × 4 water × 3	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	PCNA2_SULSO
Isoform	—
PDB entities	3
Chains and sequence ranges	Author chain C； PDBConstruct 1–249； UniProt 1–249

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	2izo
Deposition date deposition_date	2006-07-25
Structure title title	Structure of an Archaeal PCNA1-PCNA2-FEN1 Complex
Keywords keywords	HYDROLASE, DNA REPAIR, DNA-BINDING, ENDONUCLEASE, METAL-BINDING, EXCISION REPAIR, DNA REPLICATION, PCNA, FEN1, NUCLEASE, MAGNESIUM; HYDROLASE
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.

2izo__assembly_1__model_1

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

Download this curve (.dat)

2izo__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

2izo__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	34.15 Å
Rg (electron density)	33.60 Å
Total Rg	34.14 Å
Atom count	5733
Residues	757
Excluded volume	103000 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`2izo__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 (6)

Entity 1 Entity 1 polymer

Description description	FLAP STRUCTURE-SPECIFIC ENDONUCLEASE
Molecular weight formula_weight	39358.3 kDa
EC 编号 ec_number	3.1.-.-
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	5811

MDLVKDVKRELSFSELKGKRVSIDGYNALYQFLAAIRQPDGTPLMDSQGRVTSHLSGLFYRTINILEEGVIPIYVFDGKPPEQKSEELERRRKAKEEAERKLERAKSEGKIEELRKYSQAILRLSNIMVEESKKLLRAMGIPIVQAPSEGEAEAAYLNKLGLSWAAASQDYDAILFGAKRLVRNLTITGKRKLPNKDVYVEIKPELIETEILLKKLGITREQLIDIGILIGTDYNPDGIRGIGPERALKIIKKYGKIEKAMEYGEISKKDINFNIDEIRGLFLNPQVVKPEEALDLNEPNGEDIINILVYEHNFSEERVKNGIERLTKAIKEAKGASRQTGLDRWF

Source Source

Source organism organism	SULFOLOBUS SOLFATARICUS
NCBI taxonomy ID ncbi_taxonomy_id	2287
Host organism host_organism	ESCHERICHIA COLI

Entity 2 Entity 2 polymer

Description description	DNA POLYMERASE SLIDING CLAMP C
Molecular weight formula_weight	27551.2 kDa
Source method src_method	man
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	B

MMKAKVIDAVSFSYILRTVGDFLSEANFIVTKEGIRVSGIDPSRVVFLDIFLPSSYFEGFEVSQEKEIIGFKLEDVNDILKRVLKDDTLILSSNESKLTLTFDGEFTRSFELPLIQVESTSPPSVNLEFPFKAQLLTITFADIIDELSDLGEVLNIHSKENKLYFEVIGDLSTAKVELSTDNGTLLEASGADVSSSYGMEYVANTTKMRRASDSMELYFGSQIPLKLRFKLPQEGYGDFYIAPRAD

Source Source

Source organism organism	SULFOLOBUS SOLFATARICUS
NCBI taxonomy ID ncbi_taxonomy_id	2287
Host organism host_organism	ESCHERICHIA COLI

Entity 3 Entity 3 polymer

Description description	DNA POLYMERASE SLIDING CLAMP B
Molecular weight formula_weight	27569.7 kDa
Source method src_method	man
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	C

MFKIVYPNAKDFFSFINSITNVTDSIILNFTEDGIFSRHLTEDKVLMAIMRIPKDVLSEYSIDSPTSVKLDVSSVKKILSKASSKKATIELTETDSGLKIIIRDEKSGAKSTIYIKAEKGQVEQLTEPKVNLAVNFTTDESVLNVIAADVTLVGEEMRISTEEDKIKIEAGEEGKRYVAFLMKDKPLKELSIDTSASSSYSAEMFKDAVKGLRGFSAPTMVSFGENLPMKIDVEAVSGGHMIFWIAPRL

Source Source

Source organism organism	SULFOLOBUS SOLFATARICUS
NCBI taxonomy ID ncbi_taxonomy_id	2287
Host organism host_organism	ESCHERICHIA COLI

Entity 4 Entity 4 non-polymer

Description description	ZINC ION
Molecular weight formula_weight	65.4 kDa
Source method src_method	syn
Copy count entity_count	4

Entity 5 Entity 5 non-polymer

Description description	MAGNESIUM ION
Molecular weight formula_weight	24.3 kDa
Source method src_method	syn
Copy count entity_count	4

Entity 6 Entity 6 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	78

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6. Fold Classification (SCOP + CATH) 4 domains

SCOP 2.08 (2 domains)

Domain ID domain_id	d2izob1
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.131 — DNA clamp
Superfamily Superfamily superfamily	d.131.1 — DNA clamp
Family Family family	d.131.1.0 — automated matches

Domain ID domain_id	d2izob2
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.131 — DNA clamp
Superfamily Superfamily superfamily	d.131.1 — DNA clamp
Family Family family	d.131.1.0 — automated matches

CATH v4.4 (2 domains)

Domain ID domain_id	2izoB00
Class class	3 — Alpha Beta
Architecture architecture	70 — Box
Topology topology	10 — Proliferating Cell Nuclear Antigen
Homologous superfamily homologous superfamily	10 —

Domain ID domain_id	2izoC01
Class class	3 — Alpha Beta
Architecture architecture	70 — Box
Topology topology	10 — Proliferating Cell Nuclear Antigen
Homologous superfamily homologous superfamily	10 —

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Unit-cell length a length_a	93.986 Å
Unit-cell length b length_b	99.774 Å
Unit-cell length c length_c	99.958 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	2.900 Å
Low-resolution limit resolution_low	30.000 Å
R factor r_factor	0.2530
R_work r_work	0.2500
R_free r_free	0.3120

Structure of an Archaeal PCNA1-PCNA2-FEN1 Complex

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

FLAP STRUCTURE-SPECIFIC ENDONUCLEASE

State in the Current Structure

Other States of the Same Protein in the Database

DNA POLYMERASE SLIDING CLAMP C

State in the Current Structure

Other States of the Same Protein in the Database

DNA POLYMERASE SLIDING CLAMP B

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

2izo__assembly_1__model_1

2izo__assembly_1__model_1 | I(q)

2izo__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 (6)

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 non-polymer

Entity 6 Entity 6 water

6. Fold Classification (SCOP + CATH) 4 domains

SCOP 2.08 (2 domains)

CATH v4.4 (2 domains)

7. Citations (1)

Structure of an Archaeal PCNA1-PCNA2-FEN1 Complex

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

FLAP STRUCTURE-SPECIFIC ENDONUCLEASE

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

DNA POLYMERASE SLIDING CLAMP C

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

DNA POLYMERASE SLIDING CLAMP B

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

2izo__assembly_1__model_1

2izo__assembly_1__model_1 | I(q)

2izo__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 (6)

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 non-polymer

Entity 6 Entity 6 water

6. Fold Classification (SCOP + CATH) 4 domains

SCOP 2.08 (2 domains)

CATH v4.4 (2 domains)

7. Citations (1)