SAXSdb — 2ix2

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

DNA POLYMERASE SLIDING CLAMP B

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 A × 1 （P57765） 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	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–249； UniProt 1–249

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	DNA POLYMERASE SLIDING CLAMP B × 1 （P57766） DNA POLYMERASE SLIDING CLAMP A × 1 （P57765） 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 1–245； UniProt 1–245

DNA POLYMERASE SLIDING CLAMP A

SULFOLOBUS SOLFATARICUS

UniProt P57765

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 B × 1 （P57766） DNA POLYMERASE SLIDING CLAMP C × 1 （Q97Z84） water × 3	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	PCNA1_SULSO
Isoform	—
PDB entities	3
Chains and sequence ranges	Author chain C； PDBConstruct 16–259； UniProt 1–244

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	2ix2
Deposition date deposition_date	2006-07-05
Structure title title	Crystal structure of the heterotrimeric PCNA from Sulfolobus solfataricus
Keywords keywords	REPLICATION, SULFOLOBUS SULFATARICUS, PCNA, DNA-BINDING, DNA 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.

2ix2__assembly_1__model_1

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

Download this curve (.dat)

2ix2__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

2ix2__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	32.83 Å
Rg (electron density)	31.63 Å
Total Rg	32.37 Å
Atom count	5581
Residues	712
Excluded volume	100510 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`2ix2__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 (4)

Entity 1 Entity 1 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	A
Atom count atom_count	5701

MFKIVYPNAKDFFSFINSITNVTDSIILNFTEDGIFSRHLTEDKVLMAIMRIPKDVLSEYSIDSPTSVKLDVSSVKKILSKASSKKATIELTETDSGLKIIIRDEKSGAKSTIYIKAEKGQVEQLTEPKVNLAVNFTTDESVLNVIAADVTLVGEEMRISTEEDKIKIEAGEEGKRYVAFLMKDKPLKELSIDTSASSSYSAEMFKDAVKGLRGFSAPTMVSFGENLPMKIDVEAVSGGHMIFWIAPRL

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	27461.1 kDa
Source method src_method	man
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	B

MKAKVIDAVSFSYILRTVGDFLSEANFIVTKEGIRVSGIDPSRVVFLDIFLPSSYFEGFEVSQEKEIIGFKLEDVNDILKRVLKDDTLILSSNESKLTLTFDGEFTRSFELPLIQVESTQPPSVNLEFPFKAQLLTITFADIIDELSDLGEVLNIHSKENKLYFEVIGDLSTAKVELSTDNGTLLEASGADVSSSYGMEYVANTTKMRRASDSMELYFGSQIPLKLRFKLPQEGYGDFYIAPRAD

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 A
Molecular weight formula_weight	29384.4 kDa
Source method src_method	man
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	C

MIYLKSFERNIRLINMKVVYDDVRVLKDIIQALARLVDEAVLKFKQDSVELVALDRAHISLISVNLPREMFKEYDVNDEFKFGFNTQYLMKILKVAKRKEAIEIASESPDSVIINIIGSTNREFNVRNLEVSEQEIPEINLQFDISATISSDGFKSAISEVSTVTDNVVVEGHEDRILIKAEGESEVEVEFSKDTGGLQDLEFSKESKNSYSAEYLDDVLSLTKLSDYVKISFGNQKPLQLFFNMEGGGKVTYLLAPKV

Source Source

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

Entity 4 Entity 4 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	120

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6. Fold Classification (SCOP + CATH) 7 domains

SCOP 2.08 (4 domains)

Domain ID domain_id	d2ix2b1
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	d2ix2b2
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	d2ix2c1
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	d2ix2c2
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 (3 domains)

Domain ID domain_id	2ix2A01
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	2ix2B00
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	2ix2C00
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	44.808 Å
Unit-cell length b length_b	78.798 Å
Unit-cell length c length_c	125.611 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	100.51 °
Unit-cell angle γ angle_gamma	90.00 °
Molecules per unit cell Z z_pdb	2

Space group space_group	P 1 21 1
Space-group number int_tables_number	4
Crystal system crystal_system	—

Resolution resolution	2.200 Å
Low-resolution limit resolution_low	48.620 Å
R factor r_factor	0.2200
R_work r_work	0.2170
R_free r_free	0.2730

Crystal structure of the heterotrimeric PCNA from Sulfolobus solfataricus

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

DNA POLYMERASE SLIDING CLAMP B

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 A

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

2ix2__assembly_1__model_1

2ix2__assembly_1__model_1 | I(q)

2ix2__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 (4)

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 water

6. Fold Classification (SCOP + CATH) 7 domains

SCOP 2.08 (4 domains)

CATH v4.4 (3 domains)

7. Citations (1)

Crystal structure of the heterotrimeric PCNA from Sulfolobus solfataricus

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

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

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 A

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

2ix2__assembly_1__model_1

2ix2__assembly_1__model_1 | I(q)

2ix2__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 (4)

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 water

6. Fold Classification (SCOP + CATH) 7 domains

SCOP 2.08 (4 domains)

CATH v4.4 (3 domains)

7. Citations (1)