SAXSdb — 1sst

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

Serine acetyltransferase

Haemophilus influenzae

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein homooligomer	Homooligomer	Protein 6	COENZYME A × 6 water × 6	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	CYSE_HAEIN
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–267； UniProt 1–267 Author chain B； PDBConstruct 1–267； UniProt 1–267 Author chain C； PDBConstruct 1–267； UniProt 1–267

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	1sst
Deposition date deposition_date	2004-03-24
Structure title title	Serine Acetyltransferase- Complex with CoA
Keywords keywords	LEFT-HANDED PARALLEL BETA HELIX, transferase; TRANSFERASE
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.

1sst__assembly_1__model_1

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

Download this curve (.dat)

1sst__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

1sst__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)	33.02 Å
Total Rg	33.78 Å
Atom count	11068
Residues	1408
Excluded volume	197250 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`1sst__assembly_1__model_1`	hexameric （6）	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 (3)

Entity 1 Entity 1 polymer

Description description	Serine acetyltransferase
Molecular weight formula_weight	29198.4 kDa
EC 编号 ec_number	2.3.1.30
Source method src_method	man
Copy count entity_count	3

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B,C
Atom count atom_count	5706

MTLDVWQHIRQEAKELAENEPMLASFFHSTILKHQNLGGALSYLLANKLANPIMPAISLREIIEEAYQSNPSIIDCAACDIQAVRHRDPAVELWSTPLLYLKGFHAIQSYRITHYLWNQNRKSLALYLQNQISVAFDVDIHPAAKIGHGIMFDHATGIVVGETSVIENDVSILQGVTLGGTGKESGDRHPKVREGVMIGAGAKILGNIEVGKYAKIGANSVVLNPVPEYATAAGVPARIVSQDKAAKPAFDMNQYFIGIDDGMNLNI

Source Source

Source organism organism	Haemophilus influenzae
NCBI taxonomy ID ncbi_taxonomy_id	727
Host organism host_organism	Escherichia coli BL21(DE3)

Entity 2 Entity 2 non-polymer

Description description	COENZYME A
Molecular weight formula_weight	767.5 kDa
Source method src_method	syn
Copy count entity_count	3

Entity 3 Entity 3 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	172

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6. Fold Classification (SCOP + CATH) 9 domains

SCOP 2.08 (3 domains)

Domain ID domain_id	d1ssta_
Class class	b — All beta proteins
Fold Fold fold	b.81 — Single-stranded left-handed beta-helix
Superfamily Superfamily superfamily	b.81.1 — Trimeric LpxA-like enzymes
Family Family family	b.81.1.6 — Serine acetyltransferase

Domain ID domain_id	d1sstb_
Class class	b — All beta proteins
Fold Fold fold	b.81 — Single-stranded left-handed beta-helix
Superfamily Superfamily superfamily	b.81.1 — Trimeric LpxA-like enzymes
Family Family family	b.81.1.6 — Serine acetyltransferase

Domain ID domain_id	d1sstc_
Class class	b — All beta proteins
Fold Fold fold	b.81 — Single-stranded left-handed beta-helix
Superfamily Superfamily superfamily	b.81.1 — Trimeric LpxA-like enzymes
Family Family family	b.81.1.6 — Serine acetyltransferase

CATH v4.4 (6 domains)

Domain ID domain_id	1sstA01
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	3130 — serine acetyltransferase, domain 1
Homologous superfamily homologous superfamily	10 — serine acetyltransferase, domain 1

Domain ID domain_id	1sstA02
Class class	2 — Mainly Beta
Architecture architecture	160 — 3 Solenoid
Topology topology	10 — UDP N-Acetylglucosamine Acyltransferase; domain 1
Homologous superfamily homologous superfamily	10 — Hexapeptide repeat proteins

Domain ID domain_id	1sstB01
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	3130 — serine acetyltransferase, domain 1
Homologous superfamily homologous superfamily	10 — serine acetyltransferase, domain 1

Domain ID domain_id	1sstB02
Class class	2 — Mainly Beta
Architecture architecture	160 — 3 Solenoid
Topology topology	10 — UDP N-Acetylglucosamine Acyltransferase; domain 1
Homologous superfamily homologous superfamily	10 — Hexapeptide repeat proteins

Domain ID domain_id	1sstC01
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	3130 — serine acetyltransferase, domain 1
Homologous superfamily homologous superfamily	10 — serine acetyltransferase, domain 1

Domain ID domain_id	1sstC02
Class class	2 — Mainly Beta
Architecture architecture	160 — 3 Solenoid
Topology topology	10 — UDP N-Acetylglucosamine Acyltransferase; domain 1
Homologous superfamily homologous superfamily	10 — Hexapeptide repeat proteins

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Unit-cell length a length_a	111.300 Å
Unit-cell length b length_b	125.000 Å
Unit-cell length c length_c	103.000 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	24

Space group space_group	C 2 2 21
Space-group number int_tables_number	20
Crystal system crystal_system	—

Resolution resolution	2.000 Å
Low-resolution limit resolution_low	31.250 Å
R factor r_factor	0.2250
R_work r_work	0.2230
R_free r_free	0.2700

Serine Acetyltransferase- Complex with CoA

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

Serine acetyltransferase

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

1sst__assembly_1__model_1

1sst__assembly_1__model_1 | I(q)

1sst__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 (3)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 non-polymer

Entity 3 Entity 3 water

6. Fold Classification (SCOP + CATH) 9 domains

SCOP 2.08 (3 domains)

CATH v4.4 (6 domains)

7. Citations (1)

Serine Acetyltransferase- Complex with CoA

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

Serine acetyltransferase

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

1sst__assembly_1__model_1

1sst__assembly_1__model_1 | I(q)

1sst__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 (3)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 non-polymer

Entity 3 Entity 3 water

6. Fold Classification (SCOP + CATH) 9 domains

SCOP 2.08 (3 domains)

CATH v4.4 (6 domains)

7. Citations (1)