SAXSdb — 1z1a

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

Regulatory protein SIR1

Saccharomyces cerevisiae

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

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	SIR1_YEAST
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 4–142； UniProt 473–611 Author chain B； PDBConstruct 4–142； UniProt 473–611

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	1z1a
Deposition date deposition_date	2005-03-03
Structure title title	S. cerevisiae Sir1 ORC-interaction domain
Keywords keywords	novel fold, TRANSCRIPTION; TRANSCRIPTION
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.

1z1a__assembly_1__model_1

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

Download this curve (.dat)

1z1a__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

1z1a__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	16.32 Å
Rg (electron density)	15.14 Å
Total Rg	16.55 Å
Atom count	964
Residues	114
Excluded volume	17585 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`1z1a__assembly_1__model_1`	monomeric （1）	Success	4.1.3-1-20251215 (887e7ef)	View Download
2	1	`1z1a__assembly_2__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) 2 domains

SCOP 2.08 (2 domains)

Domain ID domain_id	d1z1aa1
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.339 — ORC1-binding domain
Superfamily Superfamily superfamily	d.339.1 — ORC1-binding domain
Family Family family	d.339.1.1 — ORC1-binding domain

Domain ID domain_id	d1z1ab_
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.339 — ORC1-binding domain
Superfamily Superfamily superfamily	d.339.1 — ORC1-binding domain
Family Family family	d.339.1.1 — ORC1-binding domain

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Unit-cell length a length_a	60.928 Å
Unit-cell length b length_b	60.928 Å
Unit-cell length c length_c	159.257 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	90.00 °
Unit-cell angle γ angle_gamma	120.00 °
Molecules per unit cell Z z_pdb	12

Space group space_group	P 32 2 1
Space-group number int_tables_number	154
Crystal system crystal_system	—

Resolution resolution	2.500 Å
Low-resolution limit resolution_low	20.000 Å
R factor r_factor	0.2415
R_work r_work	0.2379
R_free r_free	0.2742

Description description	Regulatory protein SIR1
Molecular weight formula_weight	16846.1 kDa
Mutation mutation	C593A
Source method src_method	man
Copy count entity_count	2

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B
Atom count atom_count	1991

S. cerevisiae Sir1 ORC-interaction domain

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

Regulatory protein SIR1

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

1z1a__assembly_1__model_1

1z1a__assembly_1__model_1 | I(q)

1z1a__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 (2)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 water

6. Fold Classification (SCOP + CATH) 2 domains

SCOP 2.08 (2 domains)

7. Citations (1)

Source organism organism	Saccharomyces cerevisiae
Common name common_name	;baker's yeast ;
NCBI taxonomy ID ncbi_taxonomy_id	4932
Host organism host_organism	Escherichia coli BL21

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	43

S. cerevisiae Sir1 ORC-interaction domain

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

Regulatory protein SIR1

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

1z1a__assembly_1__model_1

1z1a__assembly_1__model_1 | I(q)

1z1a__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 (2)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 water

6. Fold Classification (SCOP + CATH) 2 domains

SCOP 2.08 (2 domains)

7. Citations (1)