1ssm

Serine Acetyltransferase- Apoenzyme (truncated)

Method: X-RAY DIFFRACTION

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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	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 1–242； UniProt 1–242 Author chain B； PDBConstruct 1–242； UniProt 1–242 Author chain C； PDBConstruct 1–242； UniProt 1–242 Author chain D； PDBConstruct 1–242； UniProt 1–242 Author chain E； PDBConstruct 1–242； UniProt 1–242 Author chain F； PDBConstruct 1–242； UniProt 1–242

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	1ssm
Deposition date deposition_date	2004-03-24
Structure title title	Serine Acetyltransferase- Apoenzyme (truncated)
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.

1ssm__assembly_1__model_1

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

Download this curve (.dat)

1ssm__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

1ssm__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	33.47 Å
Rg (electron density)	32.64 Å
Total Rg	33.25 Å
Atom count	10945
Residues	1410
Excluded volume	195790 Å³
Maximum q	0.500 Å⁻¹

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

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6. Fold Classification (SCOP + CATH) 18 domains

SCOP 2.08 (6 domains)

Domain ID domain_id	d1ssma_
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	d1ssmb_
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	d1ssmc_
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	d1ssmd_
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	d1ssme_
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	d1ssmf_
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 (12 domains)

Domain ID domain_id	1ssmA01
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	1ssmA02
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	1ssmB01
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	1ssmB02
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	1ssmC01
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	1ssmC02
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	1ssmD01
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	1ssmD02
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	1ssmE01
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	1ssmE02
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	1ssmF01
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	1ssmF02
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	107.100 Å
Unit-cell length b length_b	126.600 Å
Unit-cell length c length_c	107.300 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	P 21 21 2
Space-group number int_tables_number	18
Crystal system crystal_system	—

Resolution resolution	2.150 Å
Low-resolution limit resolution_low	29.740 Å
R factor r_factor	0.2300
R_work r_work	0.2270
R_free r_free	0.2780

Description description	Serine acetyltransferase
Molecular weight formula_weight	26646.7 kDa
EC 编号 ec_number	2.3.1.30
Source method src_method	man
Copy count entity_count	6

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B,C,D,E,F
Atom count atom_count	11514

Serine Acetyltransferase- Apoenzyme (truncated)

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

1ssm__assembly_1__model_1

1ssm__assembly_1__model_1 | I(q)

1ssm__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) 18 domains

SCOP 2.08 (6 domains)

CATH v4.4 (12 domains)

7. Citations (1)

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

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	569

Serine Acetyltransferase- Apoenzyme (truncated)

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

1ssm__assembly_1__model_1

1ssm__assembly_1__model_1 | I(q)

1ssm__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) 18 domains

SCOP 2.08 (6 domains)

CATH v4.4 (12 domains)

7. Citations (1)