SAXSdb — 1e2a

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

ENZYME IIA

Lactococcus lactis

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein homooligomer	Homooligomer	Protein 3	MAGNESIUM ION × 1 water × 3	Consistent with protein count
2	Protein homooligomer	Homooligomer	Protein 6	MAGNESIUM ION × 2 water × 6	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	PTLA_LACLA
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–105； UniProt 1–105 Author chain B； PDBConstruct 1–105； UniProt 1–105 Author chain C； PDBConstruct 1–105； UniProt 1–105

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	1e2a
Deposition date deposition_date	1997-04-25
Structure title title	ENZYME IIA FROM THE LACTOSE SPECIFIC PTS FROM LACTOCOCCUS LACTIS
Keywords keywords	ENZYME IIA, HELICAL BUNDLES, PTS, TRANSFERASE, PHOSPHOTRANSFERASE SYSTEM; 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.

1e2a__assembly_1__model_1

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

Download this curve (.dat)

1e2a__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

1e2a__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	20.31 Å
Rg (electron density)	19.27 Å
Total Rg	19.97 Å
Atom count	2362
Residues	306
Excluded volume	41683 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`1e2a__assembly_1__model_1`	trimeric （3）	Success	4.1.3-1-20251215 (887e7ef)	View Download
2	1	`1e2a__assembly_2__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	ENZYME IIA
Molecular weight formula_weight	11463.1 kDa
EC 编号 ec_number	2.7.1.69
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	2418

MNREEMTLLGFEIVAYAGDARSKLLEALKAAENGDFAKADSLVVEAGSCIAEAHSSQTGMLAREASGEELPYSVTMMHGQDHLMTTILLKDVIHHLIELYKRGAK

Source Source

Source organism organism	Lactococcus lactis
NCBI taxonomy ID ncbi_taxonomy_id	1358
Host organism host_organism	Escherichia coli

Entity 2 Entity 2 non-polymer

Description description	MAGNESIUM ION
Molecular weight formula_weight	24.3 kDa
Source method src_method	syn
Copy count entity_count	1

Entity 3 Entity 3 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	56

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6. Fold Classification (SCOP + CATH) 6 domains

SCOP 2.08 (3 domains)

Domain ID domain_id	d1e2aa_
Class class	a — All alpha proteins
Fold Fold fold	a.7 — Spectrin repeat-like
Superfamily Superfamily superfamily	a.7.2 — Enzyme IIa from lactose specific PTS, IIa-lac
Family Family family	a.7.2.1 — Enzyme IIa from lactose specific PTS, IIa-lac

Domain ID domain_id	d1e2ab_
Class class	a — All alpha proteins
Fold Fold fold	a.7 — Spectrin repeat-like
Superfamily Superfamily superfamily	a.7.2 — Enzyme IIa from lactose specific PTS, IIa-lac
Family Family family	a.7.2.1 — Enzyme IIa from lactose specific PTS, IIa-lac

Domain ID domain_id	d1e2ac_
Class class	a — All alpha proteins
Fold Fold fold	a.7 — Spectrin repeat-like
Superfamily Superfamily superfamily	a.7.2 — Enzyme IIa from lactose specific PTS, IIa-lac
Family Family family	a.7.2.1 — Enzyme IIa from lactose specific PTS, IIa-lac

CATH v4.4 (3 domains)

Domain ID domain_id	1e2aA00
Class class	1 — Mainly Alpha
Architecture architecture	20 — Up-down Bundle
Topology topology	58 — Methane Monooxygenase Hydroxylase; Chain G, domain 1
Homologous superfamily homologous superfamily	80 — Phosphotransferase system, lactose/cellobiose-type IIA subunit

Domain ID domain_id	1e2aB00
Class class	1 — Mainly Alpha
Architecture architecture	20 — Up-down Bundle
Topology topology	58 — Methane Monooxygenase Hydroxylase; Chain G, domain 1
Homologous superfamily homologous superfamily	80 — Phosphotransferase system, lactose/cellobiose-type IIA subunit

Domain ID domain_id	1e2aC00
Class class	1 — Mainly Alpha
Architecture architecture	20 — Up-down Bundle
Topology topology	58 — Methane Monooxygenase Hydroxylase; Chain G, domain 1
Homologous superfamily homologous superfamily	80 — Phosphotransferase system, lactose/cellobiose-type IIA subunit

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Unit-cell length a length_a	90.900 Å
Unit-cell length b length_b	90.900 Å
Unit-cell length c length_c	82.400 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 41 21 2
Space-group number int_tables_number	92
Crystal system crystal_system	—

Resolution resolution	2.300 Å
Low-resolution limit resolution_low	8.000 Å
R factor r_factor	0.1900
R_work r_work	0.1900
R_free r_free	0.2400

ENZYME IIA FROM THE LACTOSE SPECIFIC PTS FROM LACTOCOCCUS LACTIS

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

ENZYME IIA

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

1e2a__assembly_1__model_1

1e2a__assembly_1__model_1 | I(q)

1e2a__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) 6 domains

SCOP 2.08 (3 domains)

CATH v4.4 (3 domains)

7. Citations (2)

ENZYME IIA FROM THE LACTOSE SPECIFIC PTS FROM LACTOCOCCUS LACTIS

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

ENZYME IIA

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

1e2a__assembly_1__model_1

1e2a__assembly_1__model_1 | I(q)

1e2a__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) 6 domains

SCOP 2.08 (3 domains)

CATH v4.4 (3 domains)

7. Citations (2)