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2ih5

Crystal structure of the adenine-specific DNA methyltransferase M.TaqI complexed with the cofactor analog AETA and a 10 bp DNA containing an abasic site analog at the target base partner position

Method: X-RAY DIFFRACTION
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1. Protein Identity and Related Structures Protein Identity & Related Structures

Modification methylase TaqI

Thermus aquaticus

UniProt P14385

State in the Current Structure

Assembly Physical composition Protein state Molecular copy count Associated components Data consistency
1 Protein–DNA Monomer Protein 1 DNA 2 5'-D(*GP*TP*TP*CP*GP*AP*TP*GP*TP*C)-3' × 1 5'-D(*GP*AP*CP*AP*(3DR)P*CP*GP*(6MA)P*AP*C)-3' × 1 5'-DEOXY-5'-[2-(AMINO)ETHYLTHIO]ADENOSINE × 1 GLYCEROL × 1 water × 3 Consistent with all polymers

Other States of the Same Protein in the Database

Monomer
1aqi 1aqi 1aqj 1aqj 2adm 2adm

6 assemblies

Homodimer

None

Homotetramer

None

Other homooligomers

None

Heteromeric or nucleic-acid complex
1g38 1g38 2ibs 2ibs 2ibt 2ibt 2ih2 2ih2 2ih4 2ih4 2ih5 2jg3

16 assemblies; showing the first 12

View Construct and Data Evidence
UniProt name MTTA_THEAQ
Isoform —
PDB entities 3
Chains and sequence ranges Author chain A； 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_id2ih5
Deposition date deposition_date2006-09-25
Structure title titleCrystal structure of the adenine-specific DNA methyltransferase M.TaqI complexed with the cofactor analog AETA and a 10 bp DNA containing an abasic site analog at the target base partner position
Keywords keywordsDNA, DNA methyltransferase, target base partner, abasic site analog, base flipping, nucleotide flipping, TRANSFERASE-DNA COMPLEX; TRANSFERASE/DNA
Experimental Method methodX-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.

2ih5__assembly_1__model_1

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

Download this curve (.dat)

2ih5__assembly_1__model_1 | I(q)

10-2 10-1 105 106 107 q (1/Angstrom) I(q)
100 plotted points; both axes use logarithmic scales.

2ih5__assembly_1__model_1 | P(r) · Pending

The new assembly/model P(r) has not been calculated yet This placeholder does not display legacy data r (Angstrom) P(r)
P(r) will be calculated and displayed separately for the same assembly/model.
Rg（Guinier）23.91 Å
Rg (electron density)23.38 Å
Total Rg24.13 Å
Atom count3585
Residues408
Excluded volume63048 ų
Maximum q0.500 Å⁻¹
Assembly Model Structure unit Oligomeric description Status CRYSOL Actions
1 1 2ih5__assembly_1__model_1 trimeric （3） 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 (6)

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6. Fold Classification (SCOP + CATH) 4 domains

SCOP 2.08 (2 domains)

Domain ID domain_idd2ih5a1
Class classc — Alpha and beta proteins (a/b)
Fold Fold foldc.66 — S-adenosyl-L-methionine-dependent methyltransferases
Superfamily Superfamily superfamilyc.66.1 — S-adenosyl-L-methionine-dependent methyltransferases
Family Family familyc.66.1.27 — DNA methylase TaqI, N-terminal domain
Domain ID domain_idd2ih5a2
Class classd — Alpha and beta proteins (a+b)
Fold Fold foldd.287 — DNA methylase specificity domain
Superfamily Superfamily superfamilyd.287.1 — DNA methylase specificity domain
Family Family familyd.287.1.1 — TaqI C-terminal domain-like

CATH v4.4 (2 domains)

Domain ID domain_id2ih5A01
Class class3 — Alpha Beta
Architecture architecture40 — 3-Layer(aba) Sandwich
Topology topology50 — Rossmann fold
Homologous superfamily homologous superfamily150 — Vaccinia Virus protein VP39
Domain ID domain_id2ih5A02
Class class3 — Alpha Beta
Architecture architecture90 — Alpha-Beta Complex
Topology topology220 — Adenine-n6-DNA-methyltransferase TaqI; Chain A, domain 2
Homologous superfamily homologous superfamily10 — Adenine-n6-DNA-methyltransferase Taqi, Chain A, domain 2
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7. Citations (3)