3dhw

Crystal structure of methionine importer MetNI

Method: X-RAY DIFFRACTION

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

D-methionine transport system permease protein metI

Escherichia coli

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 4	Methionine import ATP-binding protein metN × 2 （P30750）	Consistent with protein count
2	Protein heterocomplex	Heteromer	Protein 4	Methionine import ATP-binding protein metN × 2 （P30750）	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	METI_ECOLI
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–217； UniProt 1–217 Author chain B； PDBConstruct 1–217； UniProt 1–217 Author chain E； PDBConstruct 1–217； UniProt 1–217 Author chain F； PDBConstruct 1–217； UniProt 1–217

Methionine import ATP-binding protein metN

Escherichia coli

UniProt P30750

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 4	D-methionine transport system permease protein metI × 2 （P31547）	Consistent with protein count
2	Protein heterocomplex	Heteromer	Protein 4	D-methionine transport system permease protein metI × 2 （P31547）	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	METN_ECOLI
Isoform	—
PDB entities	2
Chains and sequence ranges	Author chain C； PDBConstruct 1–343； UniProt 1–343 Author chain D； PDBConstruct 1–343； UniProt 1–343 Author chain G； PDBConstruct 1–343； UniProt 1–343 Author chain H； PDBConstruct 1–343； UniProt 1–343

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	3dhw
Deposition date deposition_date	2008-06-18
Structure title title	Crystal structure of methionine importer MetNI
Keywords keywords	;ABC-transporter, Methionine uptake transporter, membrane protein, Amino-acid transport, Inner membrane, Transmembrane, ATP-binding, Hydrolase, Nucleotide-binding, MEMBRANE PROTEIN-HYDROLASE COMPLEX ;; MEMBRANE PROTEIN/HYDROLASE
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.

3dhw__assembly_2__model_1

Assembly 2 · Model 1 · CRYSOL 4.1.3-1-20251215 (887e7ef)

Download this curve (.dat)

3dhw__assembly_2__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

3dhw__assembly_2__model_1 | P(r) · Pending

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

Rg（Guinier）	37.58 Å
Rg (electron density)	37.24 Å
Total Rg	37.60 Å
Atom count	8344
Residues	1092
Excluded volume	151080 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`3dhw__assembly_1__model_1`	tetrameric （4）	Success	4.1.3-1-20251215 (887e7ef)	View Download
2	1	`3dhw__assembly_2__model_1`	tetrameric （4）	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 (2)

Entity 1 Entity 1 polymer

Description description	D-methionine transport system permease protein metI
Molecular weight formula_weight	23269.9 kDa
Source method src_method	man
Copy count entity_count	4

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B,E,F
Atom count atom_count	16688

MSEPMMWLLVRGVWETLAMTFVSGFFGFVIGLPVGVLLYVTRPGQIIANAKLYRTVSAIVNIFRSIPFIILLVWMIPFTRVIVGTSIGLQAAIVPLTVGAAPFIARMVENALLEIPTGLIEASRAMGATPMQIVRKVLLPEALPGLVNAATITLITLVGYSAMGGAVGAGGLGQIGYQYGYIGYNATVMNTVLVLLVILVYLIQFAGDRIVRAVTRK

Source Source

Source organism organism	Escherichia coli
NCBI taxonomy ID ncbi_taxonomy_id	83333
Host organism host_organism	Escherichia coli

Entity 2 Entity 2 polymer

Description description	Methionine import ATP-binding protein metN
Molecular weight formula_weight	37831.3 kDa
EC 编号 ec_number	3.6.3.-
Source method src_method	man
Copy count entity_count	4

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	C,D,G,H

MIKLSNITKVFHQGTRTIQALNNVSLHVPAGQIYGVIGASGAGKSTLIRCVNLLERPTEGSVLVDGQELTTLSESELTKARRQIGMIFQHFNLLSSRTVFGNVALPLELDNTPKDEVKRRVTELLSLVGLGDKHDSYPSNLSGGQKQRVAIARALASNPKVLLCDEATSALDPATTRSILELLKDINRRLGLTILLITHEMDVVKRICDCVAVISNGELIEQDTVSEVFSHPKTPLAQKFIQSTLHLDIPEDYQERLQAEPFTDCVPMLRLEFTGQSVDAPLLSETARRFNVNNNIISAQMDYAGGVKFGIMLTEMHGTQQDTQAAIAWLQEHHVKVEVLGYV

Source Source

Source organism organism	Escherichia coli
NCBI taxonomy ID ncbi_taxonomy_id	83333
Host organism host_organism	Escherichia coli

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6. Fold Classification (SCOP + CATH) 24 domains

SCOP 2.08 (12 domains)

Domain ID domain_id	d3dhwa1
Class class	f — Membrane and cell surface proteins and peptides
Fold Fold fold	f.58 — MetI-like
Superfamily Superfamily superfamily	f.58.1 — MetI-like
Family Family family	f.58.1.1 — MetI-like

Domain ID domain_id	d3dhwb1
Class class	f — Membrane and cell surface proteins and peptides
Fold Fold fold	f.58 — MetI-like
Superfamily Superfamily superfamily	f.58.1 — MetI-like
Family Family family	f.58.1.1 — MetI-like

Domain ID domain_id	d3dhwc1
Class class	c — Alpha and beta proteins (a/b)
Fold Fold fold	c.37 — P-loop containing nucleoside triphosphate hydrolases
Superfamily Superfamily superfamily	c.37.1 — P-loop containing nucleoside triphosphate hydrolases
Family Family family	c.37.1.12 — ABC transporter ATPase domain-like

Domain ID domain_id	d3dhwc2
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.58 — Ferredoxin-like
Superfamily Superfamily superfamily	d.58.18 — ACT-like
Family Family family	d.58.18.13 — NIL domain-like

Domain ID domain_id	d3dhwd1
Class class	c — Alpha and beta proteins (a/b)
Fold Fold fold	c.37 — P-loop containing nucleoside triphosphate hydrolases
Superfamily Superfamily superfamily	c.37.1 — P-loop containing nucleoside triphosphate hydrolases
Family Family family	c.37.1.12 — ABC transporter ATPase domain-like

Domain ID domain_id	d3dhwd2
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.58 — Ferredoxin-like
Superfamily Superfamily superfamily	d.58.18 — ACT-like
Family Family family	d.58.18.13 — NIL domain-like

Domain ID domain_id	d3dhwe1
Class class	f — Membrane and cell surface proteins and peptides
Fold Fold fold	f.58 — MetI-like
Superfamily Superfamily superfamily	f.58.1 — MetI-like
Family Family family	f.58.1.1 — MetI-like

Domain ID domain_id	d3dhwf1
Class class	f — Membrane and cell surface proteins and peptides
Fold Fold fold	f.58 — MetI-like
Superfamily Superfamily superfamily	f.58.1 — MetI-like
Family Family family	f.58.1.1 — MetI-like

Domain ID domain_id	d3dhwg1
Class class	c — Alpha and beta proteins (a/b)
Fold Fold fold	c.37 — P-loop containing nucleoside triphosphate hydrolases
Superfamily Superfamily superfamily	c.37.1 — P-loop containing nucleoside triphosphate hydrolases
Family Family family	c.37.1.12 — ABC transporter ATPase domain-like

Domain ID domain_id	d3dhwg2
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.58 — Ferredoxin-like
Superfamily Superfamily superfamily	d.58.18 — ACT-like
Family Family family	d.58.18.13 — NIL domain-like

Domain ID domain_id	d3dhwh1
Class class	c — Alpha and beta proteins (a/b)
Fold Fold fold	c.37 — P-loop containing nucleoside triphosphate hydrolases
Superfamily Superfamily superfamily	c.37.1 — P-loop containing nucleoside triphosphate hydrolases
Family Family family	c.37.1.12 — ABC transporter ATPase domain-like

Domain ID domain_id	d3dhwh2
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.58 — Ferredoxin-like
Superfamily Superfamily superfamily	d.58.18 — ACT-like
Family Family family	d.58.18.13 — NIL domain-like

CATH v4.4 (12 domains)

Domain ID domain_id	3dhwA00
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	3720 — MetI-like fold
Homologous superfamily homologous superfamily	10 — MetI-like

Domain ID domain_id	3dhwB00
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	3720 — MetI-like fold
Homologous superfamily homologous superfamily	10 — MetI-like

Domain ID domain_id	3dhwC01
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	50 — Rossmann fold
Homologous superfamily homologous superfamily	300 — P-loop containing nucleotide triphosphate hydrolases

Domain ID domain_id	3dhwC02
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	70 — Alpha-Beta Plaits
Homologous superfamily homologous superfamily	260 — ACT domain

Domain ID domain_id	3dhwD01
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	50 — Rossmann fold
Homologous superfamily homologous superfamily	300 — P-loop containing nucleotide triphosphate hydrolases

Domain ID domain_id	3dhwD02
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	70 — Alpha-Beta Plaits
Homologous superfamily homologous superfamily	260 — ACT domain

Domain ID domain_id	3dhwE00
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	3720 — MetI-like fold
Homologous superfamily homologous superfamily	10 — MetI-like

Domain ID domain_id	3dhwF00
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	3720 — MetI-like fold
Homologous superfamily homologous superfamily	10 — MetI-like

Domain ID domain_id	3dhwG01
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	50 — Rossmann fold
Homologous superfamily homologous superfamily	300 — P-loop containing nucleotide triphosphate hydrolases

Domain ID domain_id	3dhwG02
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	70 — Alpha-Beta Plaits
Homologous superfamily homologous superfamily	260 — ACT domain

Domain ID domain_id	3dhwH01
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	50 — Rossmann fold
Homologous superfamily homologous superfamily	300 — P-loop containing nucleotide triphosphate hydrolases

Domain ID domain_id	3dhwH02
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	70 — Alpha-Beta Plaits
Homologous superfamily homologous superfamily	260 — ACT domain

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Unit-cell length a length_a	97.700 Å
Unit-cell length b length_b	165.400 Å
Unit-cell length c length_c	289.020 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	3.700 Å
Low-resolution limit resolution_low	39.900 Å
R factor r_factor	0.3100
R_work r_work	0.3100
R_free r_free	0.3470

Crystal structure of methionine importer MetNI

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

D-methionine transport system permease protein metI

State in the Current Structure

Other States of the Same Protein in the Database

Methionine import ATP-binding protein metN

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

3dhw__assembly_2__model_1

3dhw__assembly_2__model_1 | I(q)

3dhw__assembly_2__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 (2)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 polymer

Polymer Polymer

Source Source

6. Fold Classification (SCOP + CATH) 24 domains

SCOP 2.08 (12 domains)

CATH v4.4 (12 domains)

7. Citations (1)

Crystal structure of methionine importer MetNI

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

D-methionine transport system permease protein metI

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 import ATP-binding protein metN

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

3dhw__assembly_2__model_1

3dhw__assembly_2__model_1 | I(q)

3dhw__assembly_2__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 (2)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 polymer

Polymer Polymer

Source Source

6. Fold Classification (SCOP + CATH) 24 domains

SCOP 2.08 (12 domains)

CATH v4.4 (12 domains)

7. Citations (1)