SAXSdb — 3c3y

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

O-methyltransferase

Mesembryanthemum crystallinum

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein homooligomer	Homooligomer	Protein 2	CALCIUM ION × 3 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	Q6YI95_MESCR
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–237； UniProt 1–237 Author chain B； PDBConstruct 1–237； UniProt 1–237

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	3c3y
Deposition date deposition_date	2008-01-29
Structure title title	Crystal Structure of PFOMT, Phenylpropanoid and Flavonoid O-methyltransferase from M. crystallinum
Keywords keywords	plant secondary metabolism, O-methyltransferase, 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.

3c3y__assembly_1__model_1

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

Download this curve (.dat)

3c3y__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

3c3y__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	23.44 Å
Rg (electron density)	22.11 Å
Total Rg	22.93 Å
Atom count	3605
Residues	450
Excluded volume	64625 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`3c3y__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 (4)

Entity 1 Entity 1 polymer

Description description	O-methyltransferase
Molecular weight formula_weight	26618.5 kDa
EC 编号 ec_number	2.1.1.104
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	4112

MDFAVMKQVKNTGLLQSEELCQYILRTSVYPREAGFLKELREANESHPDSYMSTSPLAGQLMSFVLKLVNAKKTIEVGVFTGYSLLLTALSIPDDGKITAIDFDREAYEIGLPFIRKAGVEHKINFIESDAMLALDNLLQGQESEGSYDFGFVDADKPNYIKYHERLMKLVKVGGIVAYDNTLWGGTVAQPESEVPDFMKENREAVIELNKLLAADPRIEIVHLPLGDGITFCRRLY

Source Source

Source organism organism	Mesembryanthemum crystallinum
Common name common_name	common iceplant
NCBI taxonomy ID ncbi_taxonomy_id	3544
Host organism host_organism	Escherichia coli

Entity 2 Entity 2 non-polymer

Description description	CALCIUM ION
Molecular weight formula_weight	40.1 kDa
Source method src_method	syn
Copy count entity_count	3

Entity 3 Entity 3 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 4 Entity 4 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	480

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6. Fold Classification (SCOP + CATH) 4 domains

SCOP 2.08 (2 domains)

Domain ID domain_id	d3c3ya_
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.66.1.1 — COMT-like

Domain ID domain_id	d3c3yb_
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.66.1.1 — COMT-like

CATH v4.4 (2 domains)

Domain ID domain_id	3c3yA00
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	3c3yB00
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

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Unit-cell length a length_a	48.890 Å
Unit-cell length b length_b	71.830 Å
Unit-cell length c length_c	128.120 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 21
Space-group number int_tables_number	19
Crystal system crystal_system	—

Resolution resolution	1.371 Å
Low-resolution limit resolution_low	19.270 Å
R factor r_factor	0.1890
R_work r_work	0.1870
R_free r_free	0.2220

Crystal Structure of PFOMT, Phenylpropanoid and Flavonoid O-methyltransferase from M. crystallinum

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

O-methyltransferase

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

3c3y__assembly_1__model_1

3c3y__assembly_1__model_1 | I(q)

3c3y__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 (4)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 non-polymer

Entity 3 Entity 3 non-polymer

Entity 4 Entity 4 water

6. Fold Classification (SCOP + CATH) 4 domains

SCOP 2.08 (2 domains)

CATH v4.4 (2 domains)

7. Citations (1)

Crystal Structure of PFOMT, Phenylpropanoid and Flavonoid O-methyltransferase from M. crystallinum

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

O-methyltransferase

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

3c3y__assembly_1__model_1

3c3y__assembly_1__model_1 | I(q)

3c3y__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 (4)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 non-polymer

Entity 3 Entity 3 non-polymer

Entity 4 Entity 4 water

6. Fold Classification (SCOP + CATH) 4 domains

SCOP 2.08 (2 domains)

CATH v4.4 (2 domains)

7. Citations (1)