SAXSdb — 2cx8

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

methyl transferase

Thermus thermophilus

State in the Current Structure

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

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	Q5SKI6_THET8
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–228； UniProt 1–228 Author chain B； PDBConstruct 1–228； UniProt 1–228

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	2cx8
Deposition date deposition_date	2005-06-28
Structure title title	Crystal structure of methyltransferase with ligand(SAH)
Keywords keywords	;methyltransferase, type IV, RSGI, Structural Genomics, NPPSFA, National Project on Protein Structural and Functional Analyses, RIKEN Structural Genomics/Proteomics Initiative, 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.

2cx8__assembly_1__model_1

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

Download this curve (.dat)

2cx8__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

2cx8__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	23.14 Å
Rg (electron density)	22.21 Å
Total Rg	23.11 Å
Atom count	3069
Residues	396
Excluded volume	55153 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`2cx8__assembly_1__model_1`	dimeric （2）	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	methyl transferase
Molecular weight formula_weight	24802.6 kDa
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	3166

MRPHRAFSPGLTGVLPLRETRHLVEVLRARVGDRFTVFDGEREALAEVVDLGPPLRYRVLEERRPEREVGVEVVLYVALLKGDKLAEVVRAATELGATRIQPLVTRHSVPKEMGEGKLRRLRAVALEAAKQSGRVVVPEVLPPIPLKAVPQVAQGLVAHVGATARVREVLDPEKPLALAVGPEGGFAEEEVALLEARGFTPVSLGRRILRAETAALALLALCTAGEGR

Source Source

Source organism organism	Thermus thermophilus
NCBI taxonomy ID ncbi_taxonomy_id	274
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	97

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6. Fold Classification (SCOP + CATH) 6 domains

SCOP 2.08 (3 domains)

Domain ID domain_id	d2cx8a1
Class class	b — All beta proteins
Fold Fold fold	b.122 — PUA domain-like
Superfamily Superfamily superfamily	b.122.1 — PUA domain-like
Family Family family	b.122.1.2 — YggJ N-terminal domain-like

Domain ID domain_id	d2cx8a2
Class class	c — Alpha and beta proteins (a/b)
Fold Fold fold	c.116 — alpha/beta knot
Superfamily Superfamily superfamily	c.116.1 — alpha/beta knot
Family Family family	c.116.1.5 — YggJ C-terminal domain-like

Domain ID domain_id	d2cx8b1
Class class	c — Alpha and beta proteins (a/b)
Fold Fold fold	c.116 — alpha/beta knot
Superfamily Superfamily superfamily	c.116.1 — alpha/beta knot
Family Family family	c.116.1.5 — YggJ C-terminal domain-like

CATH v4.4 (3 domains)

Domain ID domain_id	2cx8A01
Class class	2 — Mainly Beta
Architecture architecture	40 — Beta Barrel
Topology topology	240 — Ribosomal Protein L25; Chain P
Homologous superfamily homologous superfamily	20 — Hypothetical PUA domain-like; domain 1

Domain ID domain_id	2cx8A02
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	1280 — Alpha/beta knot
Homologous superfamily homologous superfamily	10 — SPOUT methyltransferase, trefoil knot domain

Domain ID domain_id	2cx8B01
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	1280 — Alpha/beta knot
Homologous superfamily homologous superfamily	10 — SPOUT methyltransferase, trefoil knot domain

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Unit-cell length a length_a	53.866 Å
Unit-cell length b length_b	77.821 Å
Unit-cell length c length_c	55.085 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	115.12 °
Unit-cell angle γ angle_gamma	90.00 °
Molecules per unit cell Z z_pdb	4

Space group space_group	P 1 21 1
Space-group number int_tables_number	4
Crystal system crystal_system	—

Resolution resolution	2.530 Å
Low-resolution limit resolution_low	48.770 Å
R factor r_factor	0.2230
R_work r_work	0.2230
R_free r_free	0.2850

Crystal structure of methyltransferase with ligand(SAH)

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

methyl transferase

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

2cx8__assembly_1__model_1

2cx8__assembly_1__model_1 | I(q)

2cx8__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 (1)

Crystal structure of methyltransferase with ligand(SAH)

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

methyl transferase

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

2cx8__assembly_1__model_1

2cx8__assembly_1__model_1 | I(q)

2cx8__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 (1)