SAXSdb — 1aqi

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

ADENINE-N6-DNA-METHYLTRANSFERASE TAQI

Thermus aquaticus

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein monomer	Monomer	Protein 1	S-ADENOSYL-L-HOMOCYSTEINE × 1 water × 1	Consistent with protein count
2	Protein monomer	Monomer	Protein 1	S-ADENOSYL-L-HOMOCYSTEINE × 1 water × 1	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	MTTA_THEAQ
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–421； UniProt 1–421 Author chain B； PDBConstruct 1–421； UniProt 1–421

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	1aqi
Deposition date deposition_date	1996-07-25
Structure title title	STRUCTURE OF ADENINE-N6-DNA-METHYLTRANSFERASE TAQI
Keywords keywords	METHYLTRANSFERASE, TRANSFERASE, RESTRICTION SYSTEM; METHYLTRANSFERASE
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.

1aqi__assembly_1__model_1

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

Download this curve (.dat)

1aqi__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

1aqi__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	25.87 Å
Rg (electron density)	24.92 Å
Total Rg	25.71 Å
Atom count	3127
Residues	382
Excluded volume	56084 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`1aqi__assembly_1__model_1`	monomeric （1）	Success	4.1.3-1-20251215 (887e7ef)	View Download
2	1	`1aqi__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 (3)

Entity 1 Entity 1 polymer

Description description	ADENINE-N6-DNA-METHYLTRANSFERASE TAQI
Molecular weight formula_weight	47931.2 kDa
EC 编号 ec_number	2.1.1.72
Source method src_method	man
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B
Atom count atom_count	6322

MGLPPLLSLPSNSAPRSLGRVETPPEVVDFMVSLAEAPRGGRVLEPACAHGPFLRAFREAHGTGYRFVGVEIDPKALDLPPWAEGILADFLLWEPGEAFDLILGNPPYGIVGEASKYPIHVFKAVKDLYKKAFSTWKGKYNLYGAFLEKAVRLLKPGGVLVFVVPATWLVLEDFALLREFLAREGKTSVYYLGEVFPQKKVSAVVIRFQKSGKGLSLWDTQESESGFTPILWAEYPHWEGEIIRFETEETRKLEISGMPLGDLFHIRFAARSPEFKKHPAVRKEPGPGLVPVLTGRNLKPGWVDYEKNHSGLWMPKERAKELRDFYATPHLVVAHTKGTRVVAAWDERAYPWREEFHLLPKEGVRLDPSTLVQWLNSEAMQKHVRTLYRDFVPHLTLRMLERLPVRREYGFHTSPESARNF

Source Source

Source organism organism	Thermus aquaticus
NCBI taxonomy ID ncbi_taxonomy_id	271
Host organism host_organism	Escherichia coli

Entity 2 Entity 2 non-polymer

Description description	S-ADENOSYL-L-HOMOCYSTEINE
Molecular weight formula_weight	384.4 kDa
Source method src_method	syn
Copy count entity_count	2

Entity 3 Entity 3 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	68

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6. Fold Classification (SCOP + CATH) 8 domains

SCOP 2.08 (4 domains)

Domain ID domain_id	d1aqia1
Class class	c — Alpha and beta proteins (a/b)
Fold Fold fold	c.66 — S-adenosyl-L-methionine-dependent methyltransferases
Superfamily Superfamily superfamily	c.66.1 — S-adenosyl-L-methionine-dependent methyltransferases
Family Family family	c.66.1.27 — DNA methylase TaqI, N-terminal domain

Domain ID domain_id	d1aqia2
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.287 — DNA methylase specificity domain
Superfamily Superfamily superfamily	d.287.1 — DNA methylase specificity domain
Family Family family	d.287.1.1 — TaqI C-terminal domain-like

Domain ID domain_id	d1aqib1
Class class	c — Alpha and beta proteins (a/b)
Fold Fold fold	c.66 — S-adenosyl-L-methionine-dependent methyltransferases
Superfamily Superfamily superfamily	c.66.1 — S-adenosyl-L-methionine-dependent methyltransferases
Family Family family	c.66.1.27 — DNA methylase TaqI, N-terminal domain

Domain ID domain_id	d1aqib2
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.287 — DNA methylase specificity domain
Superfamily Superfamily superfamily	d.287.1 — DNA methylase specificity domain
Family Family family	d.287.1.1 — TaqI C-terminal domain-like

CATH v4.4 (4 domains)

Domain ID domain_id	1aqiA01
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	50 — Rossmann fold
Homologous superfamily homologous superfamily	150 — Vaccinia Virus protein VP39

Domain ID domain_id	1aqiA02
Class class	3 — Alpha Beta
Architecture architecture	90 — Alpha-Beta Complex
Topology topology	220 — Adenine-n6-DNA-methyltransferase TaqI; Chain A, domain 2
Homologous superfamily homologous superfamily	10 — Adenine-n6-DNA-methyltransferase Taqi, Chain A, domain 2

Domain ID domain_id	1aqiB01
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	50 — Rossmann fold
Homologous superfamily homologous superfamily	150 — Vaccinia Virus protein VP39

Domain ID domain_id	1aqiB02
Class class	3 — Alpha Beta
Architecture architecture	90 — Alpha-Beta Complex
Topology topology	220 — Adenine-n6-DNA-methyltransferase TaqI; Chain A, domain 2
Homologous superfamily homologous superfamily	10 — Adenine-n6-DNA-methyltransferase Taqi, Chain A, domain 2

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Unit-cell length a length_a	132.080 Å
Unit-cell length b length_b	144.060 Å
Unit-cell length c length_c	53.440 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	8

Space group space_group	P 21 21 2
Space-group number int_tables_number	18
Crystal system crystal_system	—

Resolution resolution	2.600 Å
Low-resolution limit resolution_low	10.000 Å
R factor r_factor	0.2190
R_work r_work	0.2190
R_free r_free	0.2810

STRUCTURE OF ADENINE-N6-DNA-METHYLTRANSFERASE TAQI

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

ADENINE-N6-DNA-METHYLTRANSFERASE TAQI

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

1aqi__assembly_1__model_1

1aqi__assembly_1__model_1 | I(q)

1aqi__assembly_1__model_1 | P(r) · Pending

4. Crystallography and Experiment 4. Crystallography & Experiment

Unit cell Unit Cell

Symmetry Symmetry

Refinement Refinement

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) 8 domains

SCOP 2.08 (4 domains)

CATH v4.4 (4 domains)

7. Citations (4)

STRUCTURE OF ADENINE-N6-DNA-METHYLTRANSFERASE TAQI

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

ADENINE-N6-DNA-METHYLTRANSFERASE TAQI

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

1aqi__assembly_1__model_1

1aqi__assembly_1__model_1 | I(q)

1aqi__assembly_1__model_1 | P(r) · Pending

4. Crystallography and Experiment 4. Crystallography & Experiment

Unit cell Unit Cell

Symmetry Symmetry

Refinement Refinement

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) 8 domains

SCOP 2.08 (4 domains)

CATH v4.4 (4 domains)

7. Citations (4)