4ktv

Structural insights of MAT enzymes: MATa2b complexed with adenosine and pyrophosphate

Method: X-RAY DIFFRACTION

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

S-adenosylmethionine synthase isoform type-2

Homo sapiens

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 6	Methionine adenosyltransferase 2 subunit beta × 2 （Q9NZL9） 1,2-ETHANEDIOL × 12 ADENOSINE × 2 PHOSPHATE ION × 1 PYROPHOSPHATE 2- × 1 MAGNESIUM ION × 1 water × 6	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	METK2_HUMAN
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 2–396； UniProt 1–395 Author chain B； PDBConstruct 2–396； UniProt 1–395 Author chain C； PDBConstruct 2–396； UniProt 1–395 Author chain D； PDBConstruct 2–396； UniProt 1–395

Methionine adenosyltransferase 2 subunit beta

Homo sapiens

UniProt Q9NZL9

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 6	S-adenosylmethionine synthase isoform type-2 × 4 （P31153） 1,2-ETHANEDIOL × 12 ADENOSINE × 2 PHOSPHATE ION × 1 PYROPHOSPHATE 2- × 1 MAGNESIUM ION × 1 water × 6	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	MAT2B_HUMAN
Isoform	—
PDB entities	2
Chains and sequence ranges	Author chain E； PDBConstruct 13–327； UniProt 21–334 Author chain F； PDBConstruct 13–327； UniProt 21–334

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	4ktv
Deposition date deposition_date	2013-05-21
Structure title title	Structural insights of MAT enzymes: MATa2b complexed with adenosine and pyrophosphate
Keywords keywords	SAMe Synthesis, 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.

4ktv__assembly_1__model_1

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

Download this curve (.dat)

4ktv__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

4ktv__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	49.83 Å
Rg (electron density)	51.17 Å
Total Rg	51.00 Å
Atom count	16463
Residues	2089
Excluded volume	292550 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`4ktv__assembly_1__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 (8)

Entity 1 Entity 1 polymer

Description description	S-adenosylmethionine synthase isoform type-2
Molecular weight formula_weight	43807.7 kDa
EC 编号 ec_number	2.5.1.6
Source method src_method	man
Copy count entity_count	4

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B,C,D
Atom count atom_count	16508

SMNGQLNGFHEAFIEEGTFLFTSESVGEGHPDKICDQISDAVLDAHLQQDPDAKVACETVAKTGMILLAGEITSRAAVDYQKVVREAVKHIGYDDSSKGFDYKTCNVLVALEQQSPDIAQGVHLDRNEEDIGAGDQGLMFGYATDETEECMPLTIVLAHKLNAKLAELRRNGTLPWLRPDSKTQVTVQYMQDRGAVLPIRVHTIVISVQHDEEVCLDEMRDALKEKVIKAVVPAKYLDEDTIYHLQPSGRFVIGGPQGDAGLTGRKIIVDTYGGWGAHGGGAFSGKDYTKVDRSAAYAARWVAKSLVKGGLCRRVLVQVSYAIGVSHPLSISIFHYGTSQKSERELLEIVKKNFDLRPGVIVRDLDLKKPIYQRTAAYGHFGRDSFPWEVPKKLKY

Source Source

Source organism organism	Homo sapiens
Common name common_name	human
NCBI taxonomy ID ncbi_taxonomy_id	9606
Host organism host_organism	Escherichia coli

Entity 2 Entity 2 polymer

Description description	Methionine adenosyltransferase 2 subunit beta
Molecular weight formula_weight	36862.8 kDa
Source method src_method	man
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	E,F

GSHMMPEMPEDMEQEEVNIPNRRVLVTGATGLLGRAVHKEFQQNNWHAVGCGFRRARPKFEQVNLLDSNAVHHIIHDFQPHVIVHCAAERRPDVVENQPDAASQLNVDASGNLAKEAAAVGAFLIYISSDYVFDGTNPPYREEDIPAPLNLYGKTKLDGEKAVLENNLGAAVLRIPILYGEVEKLEESAVTVMFDKVQFSNKSANMDHWQQRFPTHVKDVATVCRQLAEKRMLDPSIKGTFHWSGNEQMTKYEMACAIADAFNLPSSHLRPITDSPVLGAQRPRNAQLDCSKLETLGIGQRTPFRIGIKESLWPFLIDKRWRQTVFH

Source Source

Source organism organism	Homo sapiens
Common name common_name	human
NCBI taxonomy ID ncbi_taxonomy_id	9606
Host organism host_organism	Escherichia coli

Entity 3 Entity 3 non-polymer

Description description	1,2-ETHANEDIOL
Molecular weight formula_weight	62.1 kDa
Source method src_method	syn
Copy count entity_count	12

Entity 4 Entity 4 non-polymer

Description description	ADENOSINE
Molecular weight formula_weight	267.2 kDa
Source method src_method	syn
Copy count entity_count	2

Entity 5 Entity 5 non-polymer

Description description	PHOSPHATE ION
Molecular weight formula_weight	95.0 kDa
Source method src_method	syn
Copy count entity_count	1

Entity 6 Entity 6 non-polymer

Description description	PYROPHOSPHATE 2-
Molecular weight formula_weight	176.0 kDa
Source method src_method	syn
Copy count entity_count	1

Entity 7 Entity 7 non-polymer

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

Entity 8 Entity 8 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	37

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6. Fold Classification (SCOP + CATH) 14 domains

CATH v4.4 (14 domains)

Domain ID domain_id	4ktvA01
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	300 — GMP Synthetase; Chain A, domain 3
Homologous superfamily homologous superfamily	10 —

Domain ID domain_id	4ktvA02
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	300 — GMP Synthetase; Chain A, domain 3
Homologous superfamily homologous superfamily	10 —

Domain ID domain_id	4ktvA03
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	300 — GMP Synthetase; Chain A, domain 3
Homologous superfamily homologous superfamily	10 —

Domain ID domain_id	4ktvB01
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	300 — GMP Synthetase; Chain A, domain 3
Homologous superfamily homologous superfamily	10 —

Domain ID domain_id	4ktvB02
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	300 — GMP Synthetase; Chain A, domain 3
Homologous superfamily homologous superfamily	10 —

Domain ID domain_id	4ktvB03
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	300 — GMP Synthetase; Chain A, domain 3
Homologous superfamily homologous superfamily	10 —

Domain ID domain_id	4ktvC01
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	300 — GMP Synthetase; Chain A, domain 3
Homologous superfamily homologous superfamily	10 —

Domain ID domain_id	4ktvC02
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	300 — GMP Synthetase; Chain A, domain 3
Homologous superfamily homologous superfamily	10 —

Domain ID domain_id	4ktvC03
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	300 — GMP Synthetase; Chain A, domain 3
Homologous superfamily homologous superfamily	10 —

Domain ID domain_id	4ktvD01
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	300 — GMP Synthetase; Chain A, domain 3
Homologous superfamily homologous superfamily	10 —

Domain ID domain_id	4ktvD02
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	300 — GMP Synthetase; Chain A, domain 3
Homologous superfamily homologous superfamily	10 —

Domain ID domain_id	4ktvD03
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	300 — GMP Synthetase; Chain A, domain 3
Homologous superfamily homologous superfamily	10 —

Domain ID domain_id	4ktvE00
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	50 — Rossmann fold
Homologous superfamily homologous superfamily	720 — NAD(P)-binding Rossmann-like Domain

Domain ID domain_id	4ktvF00
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	50 — Rossmann fold
Homologous superfamily homologous superfamily	720 — NAD(P)-binding Rossmann-like Domain

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Unit-cell length a length_a	72.090 Å
Unit-cell length b length_b	116.570 Å
Unit-cell length c length_c	299.480 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	16

Space group space_group	P 21 21 21
Space-group number int_tables_number	19
Crystal system crystal_system	—

Resolution resolution	3.300 Å
Low-resolution limit resolution_low	108.870 Å
R factor r_factor	0.1800
R_work r_work	0.1760
R_free r_free	0.2600

Structural insights of MAT enzymes: MATa2b complexed with adenosine and pyrophosphate

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

S-adenosylmethionine synthase isoform type-2

State in the Current Structure

Other States of the Same Protein in the Database

Methionine adenosyltransferase 2 subunit beta

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

4ktv__assembly_1__model_1

4ktv__assembly_1__model_1 | I(q)

4ktv__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 (8)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 polymer

Polymer Polymer

Source Source

Entity 3 Entity 3 non-polymer

Entity 4 Entity 4 non-polymer

Entity 5 Entity 5 non-polymer

Entity 6 Entity 6 non-polymer

Entity 7 Entity 7 non-polymer

Entity 8 Entity 8 water

6. Fold Classification (SCOP + CATH) 14 domains

CATH v4.4 (14 domains)

7. Citations (1)

Structural insights of MAT enzymes: MATa2b complexed with adenosine and pyrophosphate

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

S-adenosylmethionine synthase isoform type-2

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

Methionine adenosyltransferase 2 subunit beta

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

4ktv__assembly_1__model_1

4ktv__assembly_1__model_1 | I(q)

4ktv__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 (8)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 polymer

Polymer Polymer

Source Source

Entity 3 Entity 3 non-polymer

Entity 4 Entity 4 non-polymer

Entity 5 Entity 5 non-polymer

Entity 6 Entity 6 non-polymer

Entity 7 Entity 7 non-polymer

Entity 8 Entity 8 water

6. Fold Classification (SCOP + CATH) 14 domains

CATH v4.4 (14 domains)

7. Citations (1)