1ztg

human alpha polyC binding protein KH1

Method: X-RAY DIFFRACTION

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

POLY(RC)-BINDING PROTEIN 1

Homo sapiens

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein–DNA	Homooligomer	Protein 2 DNA 1	5'-D(PCPCPCPTPCPCPCPT)-3' × 1	Consistent with all polymers
2	Protein–DNA	Homooligomer	Protein 2 DNA 1	5'-D(PCPCPCPTPCPCPCPT)-3' × 1	Consistent with all polymers

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	PCBP1_HUMAN
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 3–74； UniProt 14–85 Author chain B； PDBConstruct 3–74； UniProt 14–85 Author chain C； PDBConstruct 3–74； UniProt 14–85 Author chain D； PDBConstruct 3–74； UniProt 14–85

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	1ztg
Deposition date deposition_date	2005-05-27
Structure title title	human alpha polyC binding protein KH1
Keywords keywords	KH-motif, KH-domain, protein-dna complex, DNA, RNA BINDING PROTEIN-DNA COMPLEX; DNA, RNA BINDING PROTEIN/DNA
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.

1ztg__assembly_2__model_1

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

Download this curve (.dat)

1ztg__assembly_2__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

1ztg__assembly_2__model_1 | P(r) · Pending

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

Rg（Guinier）	19.11 Å
Rg (electron density)	19.18 Å
Total Rg	19.83 Å
Atom count	1270
Residues	154
Excluded volume	22498 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`1ztg__assembly_1__model_1`	trimeric （3）	Success	4.1.3-1-20251215 (887e7ef)	View Download
2	1	`1ztg__assembly_2__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 (2)

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6. Fold Classification (SCOP + CATH) 12 domains

SCOP 2.08 (8 domains)

Domain ID domain_id	d1ztga1
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.51 — Eukaryotic type KH-domain (KH-domain type I)
Superfamily Superfamily superfamily	d.51.1 — Eukaryotic type KH-domain (KH-domain type I)
Family Family family	d.51.1.1 — Eukaryotic type KH-domain (KH-domain type I)

Domain ID domain_id	d1ztga2
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	d1ztgb1
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.51 — Eukaryotic type KH-domain (KH-domain type I)
Superfamily Superfamily superfamily	d.51.1 — Eukaryotic type KH-domain (KH-domain type I)
Family Family family	d.51.1.1 — Eukaryotic type KH-domain (KH-domain type I)

Domain ID domain_id	d1ztgb2
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	d1ztgc1
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.51 — Eukaryotic type KH-domain (KH-domain type I)
Superfamily Superfamily superfamily	d.51.1 — Eukaryotic type KH-domain (KH-domain type I)
Family Family family	d.51.1.1 — Eukaryotic type KH-domain (KH-domain type I)

Domain ID domain_id	d1ztgc2
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	d1ztgd1
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.51 — Eukaryotic type KH-domain (KH-domain type I)
Superfamily Superfamily superfamily	d.51.1 — Eukaryotic type KH-domain (KH-domain type I)
Family Family family	d.51.1.1 — Eukaryotic type KH-domain (KH-domain type I)

Domain ID domain_id	d1ztgd2
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 (4 domains)

Domain ID domain_id	1ztgA00
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	1370 — Ribosomal Protein S8; Chain: A, domain 1
Homologous superfamily homologous superfamily	10 — K Homology domain, type 1

Domain ID domain_id	1ztgB00
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	1370 — Ribosomal Protein S8; Chain: A, domain 1
Homologous superfamily homologous superfamily	10 — K Homology domain, type 1

Domain ID domain_id	1ztgC00
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	1370 — Ribosomal Protein S8; Chain: A, domain 1
Homologous superfamily homologous superfamily	10 — K Homology domain, type 1

Domain ID domain_id	1ztgD00
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	1370 — Ribosomal Protein S8; Chain: A, domain 1
Homologous superfamily homologous superfamily	10 — K Homology domain, type 1

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Unit-cell length a length_a	45.600 Å
Unit-cell length b length_b	76.800 Å
Unit-cell length c length_c	61.400 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	111.70 °
Unit-cell angle γ angle_gamma	90.00 °
Molecules per unit cell Z z_pdb	8

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

Resolution resolution	3.000 Å
Low-resolution limit resolution_low	20.000 Å
R factor r_factor	0.2401
R_work r_work	0.2401
R_free r_free	0.2928

Description description	POLY(RC)-BINDING PROTEIN 1
Molecular weight formula_weight	8106.4 kDa
Source method src_method	man
Copy count entity_count	4

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B,C,D
Atom count atom_count	2526

human alpha polyC binding protein KH1

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

POLY(RC)-BINDING PROTEIN 1

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

1ztg__assembly_2__model_1

1ztg__assembly_2__model_1 | I(q)

1ztg__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 polymer

Polymer Polymer

6. Fold Classification (SCOP + CATH) 12 domains

SCOP 2.08 (8 domains)

CATH v4.4 (4 domains)

7. Citations (1)

Source organism organism	Homo sapiens
Common name common_name	human
NCBI taxonomy ID ncbi_taxonomy_id	9606
Host organism host_organism	Escherichia coli

Description description	5'-D(PCPCPCPTPCPCPCPT)-3'
Molecular weight formula_weight	2298.5 kDa
Source method src_method	syn
Copy count entity_count	2

Polymer type type	polydeoxyribonucleotide
Chain IDs strand_id	Y,Z

human alpha polyC binding protein KH1

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

POLY(RC)-BINDING PROTEIN 1

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

1ztg__assembly_2__model_1

1ztg__assembly_2__model_1 | I(q)

1ztg__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 polymer

Polymer Polymer

6. Fold Classification (SCOP + CATH) 12 domains

SCOP 2.08 (8 domains)

CATH v4.4 (4 domains)

7. Citations (1)