1mg2

MUTATION OF ALPHA PHE55 OF METHYLAMINE DEHYDROGENASE ALTERS THE REORGANIZATION ENERGY AND ELECTRONIC COUPLING FOR ITS ELECTRON TRANSFER REACTION WITH AMICYANIN

Method: X-RAY DIFFRACTION

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

Methylamine dehydrogenase, heavy chain

Paracoccus denitrificans

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 8	Methylamine dehydrogenase, light chain × 2 （P22619） Amicyanin × 2 （P22364） CYTOCHROME C-L × 2 （P29889） PHOSPHATE ION × 4 COPPER (II) ION × 2 SODIUM ION × 2 HEME C × 2 water × 8	Consistent with protein count
2	Protein heterocomplex	Heteromer	Protein 8	Methylamine dehydrogenase, light chain × 2 （P22619） Amicyanin × 2 （P22364） CYTOCHROME C-L × 2 （P29889） PHOSPHATE ION × 4 COPPER (II) ION × 2 SODIUM ION × 2 HEME C × 2 water × 8	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	DHMH_PARDE
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–390； UniProt 28–417 Author chain E； PDBConstruct 1–390； UniProt 28–417 Author chain I； PDBConstruct 1–390； UniProt 28–417 Author chain M； PDBConstruct 1–390； UniProt 28–417

Methylamine dehydrogenase, light chain

Paracoccus denitrificans

UniProt P22619

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 8	Methylamine dehydrogenase, heavy chain × 2 （P29894） Amicyanin × 2 （P22364） CYTOCHROME C-L × 2 （P29889） PHOSPHATE ION × 4 COPPER (II) ION × 2 SODIUM ION × 2 HEME C × 2 water × 8	Consistent with protein count
2	Protein heterocomplex	Heteromer	Protein 8	Methylamine dehydrogenase, heavy chain × 2 （P29894） Amicyanin × 2 （P22364） CYTOCHROME C-L × 2 （P29889） PHOSPHATE ION × 4 COPPER (II) ION × 2 SODIUM ION × 2 HEME C × 2 water × 8	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	DHML_PARDE
Isoform	—
PDB entities	2
Chains and sequence ranges	Author chain B； PDBConstruct 1–131； UniProt 58–188 Author chain F； PDBConstruct 1–131； UniProt 58–188 Author chain J； PDBConstruct 1–131； UniProt 58–188 Author chain N； PDBConstruct 1–131； UniProt 58–188

Amicyanin

Paracoccus denitrificans

UniProt P22364

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 8	Methylamine dehydrogenase, heavy chain × 2 （P29894） Methylamine dehydrogenase, light chain × 2 （P22619） CYTOCHROME C-L × 2 （P29889） PHOSPHATE ION × 4 COPPER (II) ION × 2 SODIUM ION × 2 HEME C × 2 water × 8	Consistent with protein count
2	Protein heterocomplex	Heteromer	Protein 8	Methylamine dehydrogenase, heavy chain × 2 （P29894） Methylamine dehydrogenase, light chain × 2 （P22619） CYTOCHROME C-L × 2 （P29889） PHOSPHATE ION × 4 COPPER (II) ION × 2 SODIUM ION × 2 HEME C × 2 water × 8	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	AMCY_PARDE
Isoform	—
PDB entities	3
Chains and sequence ranges	Author chain C； PDBConstruct 1–105； UniProt 27–131 Author chain G； PDBConstruct 1–105； UniProt 27–131 Author chain K； PDBConstruct 1–105； UniProt 27–131 Author chain O； PDBConstruct 1–105； UniProt 27–131

CYTOCHROME C-L

Paracoccus denitrificans

UniProt P29889

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 8	Methylamine dehydrogenase, heavy chain × 2 （P29894） Methylamine dehydrogenase, light chain × 2 （P22619） Amicyanin × 2 （P22364） PHOSPHATE ION × 4 COPPER (II) ION × 2 SODIUM ION × 2 HEME C × 2 water × 8	Consistent with protein count
2	Protein heterocomplex	Heteromer	Protein 8	Methylamine dehydrogenase, heavy chain × 2 （P29894） Methylamine dehydrogenase, light chain × 2 （P22619） Amicyanin × 2 （P22364） PHOSPHATE ION × 4 COPPER (II) ION × 2 SODIUM ION × 2 HEME C × 2 water × 8	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	VF12_VACCP
Isoform	—
PDB entities	4
Chains and sequence ranges	Author chain D； PDBConstruct 1–155； UniProt 631–635 Author chain H； PDBConstruct 1–155； UniProt 631–635 Author chain L； PDBConstruct 1–155； UniProt 631–635 Author chain P； PDBConstruct 1–155； UniProt 631–635

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	1mg2
Deposition date deposition_date	2002-08-14
Structure title title	MUTATION OF ALPHA PHE55 OF METHYLAMINE DEHYDROGENASE ALTERS THE REORGANIZATION ENERGY AND ELECTRONIC COUPLING FOR ITS ELECTRON TRANSFER REACTION WITH AMICYANIN
Keywords keywords	electron transfer, methylamine dehydrogenase, cytochrome, blue copper protein, active site mutant, OXIDOREDUCTASE; OXIDOREDUCTASE
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.

1mg2__assembly_1__model_1

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

Download this curve (.dat)

1mg2__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

1mg2__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	39.79 Å
Rg (electron density)	40.31 Å
Total Rg	40.40 Å
Atom count	11846
Residues	1516
Excluded volume	208310 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`1mg2__assembly_1__model_1`	octameric （8）	Success	4.1.3-1-20251215 (887e7ef)	View Download
2	1	`1mg2__assembly_2__model_1`	octameric （8）	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 (9)

Entity 1 Entity 1 polymer

Description description	Methylamine dehydrogenase, heavy chain
Molecular weight formula_weight	42673.5 kDa
EC 编号 ec_number	1.4.99.3
Mutation mutation	alpha F55A of methylamine dehydrogenase
Source method src_method	man
Copy count entity_count	4

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,E,I,M
Atom count atom_count	25377

AASAQDAPEAETQAQETQGQAAARAAAADLAAGQDDEPRILEAPAPDARRVYVNDPAHAAAVTQQFVIDGEAGRVIGMIDGGFLPNPVVADDGSFIAHASTVFSRIARGERTDYVEVFDPVTLLPTADIELPDAPRFLVGTYPWMTSLTPDGKTLLFYQFSPAPAVGVVDLEGKAFKRMLDVPDCYHIFPTAPDTFFMHCRDGSLAKVAFGTEGTPEITHTEVFHPEDEFLINHPAYSQKAGRLVWPTYTGKIHQIDLSSGDAKFLPAVEALTEAERADGWRPGGWQQVAYHRALDRIYLLVDQRDEWRHKTASRFVVVLDAKTGERLAKFEMGHEIDSINVSQDEKPLLYALSTGDKTLYIHDAESGEELRSVNQLGHGPQVITTADMG

Source Source

Source organism organism	Paracoccus denitrificans
NCBI taxonomy ID ncbi_taxonomy_id	266
Host organism host_organism	Rhodobacter sphaeroides

Entity 2 Entity 2 polymer

Description description	Methylamine dehydrogenase, light chain
Molecular weight formula_weight	14210.7 kDa
EC 编号 ec_number	1.4.99.3
Source method src_method	man
Copy count entity_count	4

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	B,F,J,N

ADAPAGTDPRAKWVPQDNDIQACDYWRHCSIDGNICDCSGGSLTNCPPGTKLATASWVASCYNPTDGQSYLIAYRDCCGYNVSGRCPCLNTEGELPVYRPEFANDIIWCFGAEDDAMTYHCTISPIVGKAS

Source Source

Source organism organism	Paracoccus denitrificans
NCBI taxonomy ID ncbi_taxonomy_id	266
Host organism host_organism	Rhodobacter sphaeroides

Entity 3 Entity 3 polymer

Description description	Amicyanin
Molecular weight formula_weight	11505.2 kDa
Source method src_method	man
Copy count entity_count	4

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	C,G,K,O

DKATIPSESPFAAAEVADGAIVVDIAKMKYETPELHVKVGDTVTWINREAMPHNVHFVAGVLGEAALKGPMMKKEQAYSLTFTEAGTYDYHCTPHPFMRGKVVVE

Source Source

Source organism organism	Paracoccus denitrificans
NCBI taxonomy ID ncbi_taxonomy_id	266
Host organism host_organism	Rhodobacter sphaeroides

Entity 4 Entity 4 polymer

Description description	CYTOCHROME C-L
Molecular weight formula_weight	17094.7 kDa
Source method src_method	man
Copy count entity_count	4

Polymer Polymer

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

APQFFNIIDGSPLNFDDAMEEGRDTEAVKHFLETGENVYNEDPEILPEAEELYAGMCSGCHGHYAEGKIGPGLNDAYWTYPGNETDVGLFSTLYGGATGQMGPMWGSLTLDEMLRTMAWVRHLYTGDPKDASWLTDEQKAGFTPFQPKSSGEDQS

Source Source

Source organism organism	Paracoccus denitrificans
NCBI taxonomy ID ncbi_taxonomy_id	266
Host organism host_organism	Rhodobacter sphaeroides

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	8

Entity 6 Entity 6 non-polymer

Description description	COPPER (II) ION
Molecular weight formula_weight	63.5 kDa
Source method src_method	syn
Copy count entity_count	4

Entity 7 Entity 7 non-polymer

Description description	SODIUM ION
Molecular weight formula_weight	23.0 kDa
Source method src_method	syn
Copy count entity_count	4

Entity 8 Entity 8 non-polymer

Description description	HEME C
Molecular weight formula_weight	618.5 kDa
Source method src_method	syn
Copy count entity_count	4

Entity 9 Entity 9 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	1685

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6. Fold Classification (SCOP + CATH) 32 domains

SCOP 2.08 (16 domains)

Domain ID domain_id	d1mg2a_
Class class	b — All beta proteins
Fold Fold fold	b.69 — 7-bladed beta-propeller
Superfamily Superfamily superfamily	b.69.2 — YVTN repeat-like/Quinoprotein amine dehydrogenase
Family Family family	b.69.2.1 — Methylamine dehydrogenase, H-chain

Domain ID domain_id	d1mg2b_
Class class	g — Small proteins
Fold Fold fold	g.21 — Methylamine dehydrogenase, L chain
Superfamily Superfamily superfamily	g.21.1 — Methylamine dehydrogenase, L chain
Family Family family	g.21.1.1 — Methylamine dehydrogenase, L chain

Domain ID domain_id	d1mg2c_
Class class	b — All beta proteins
Fold Fold fold	b.6 — Cupredoxin-like
Superfamily Superfamily superfamily	b.6.1 — Cupredoxins
Family Family family	b.6.1.1 — Plastocyanin/azurin-like

Domain ID domain_id	d1mg2d_
Class class	a — All alpha proteins
Fold Fold fold	a.3 — Cytochrome c
Superfamily Superfamily superfamily	a.3.1 — Cytochrome c
Family Family family	a.3.1.1 — monodomain cytochrome c

Domain ID domain_id	d1mg2e_
Class class	b — All beta proteins
Fold Fold fold	b.69 — 7-bladed beta-propeller
Superfamily Superfamily superfamily	b.69.2 — YVTN repeat-like/Quinoprotein amine dehydrogenase
Family Family family	b.69.2.1 — Methylamine dehydrogenase, H-chain

Domain ID domain_id	d1mg2f_
Class class	g — Small proteins
Fold Fold fold	g.21 — Methylamine dehydrogenase, L chain
Superfamily Superfamily superfamily	g.21.1 — Methylamine dehydrogenase, L chain
Family Family family	g.21.1.1 — Methylamine dehydrogenase, L chain

Domain ID domain_id	d1mg2g_
Class class	b — All beta proteins
Fold Fold fold	b.6 — Cupredoxin-like
Superfamily Superfamily superfamily	b.6.1 — Cupredoxins
Family Family family	b.6.1.1 — Plastocyanin/azurin-like

Domain ID domain_id	d1mg2h_
Class class	a — All alpha proteins
Fold Fold fold	a.3 — Cytochrome c
Superfamily Superfamily superfamily	a.3.1 — Cytochrome c
Family Family family	a.3.1.1 — monodomain cytochrome c

Domain ID domain_id	d1mg2i_
Class class	b — All beta proteins
Fold Fold fold	b.69 — 7-bladed beta-propeller
Superfamily Superfamily superfamily	b.69.2 — YVTN repeat-like/Quinoprotein amine dehydrogenase
Family Family family	b.69.2.1 — Methylamine dehydrogenase, H-chain

Domain ID domain_id	d1mg2j_
Class class	g — Small proteins
Fold Fold fold	g.21 — Methylamine dehydrogenase, L chain
Superfamily Superfamily superfamily	g.21.1 — Methylamine dehydrogenase, L chain
Family Family family	g.21.1.1 — Methylamine dehydrogenase, L chain

Domain ID domain_id	d1mg2k_
Class class	b — All beta proteins
Fold Fold fold	b.6 — Cupredoxin-like
Superfamily Superfamily superfamily	b.6.1 — Cupredoxins
Family Family family	b.6.1.1 — Plastocyanin/azurin-like

Domain ID domain_id	d1mg2l_
Class class	a — All alpha proteins
Fold Fold fold	a.3 — Cytochrome c
Superfamily Superfamily superfamily	a.3.1 — Cytochrome c
Family Family family	a.3.1.1 — monodomain cytochrome c

Domain ID domain_id	d1mg2m_
Class class	b — All beta proteins
Fold Fold fold	b.69 — 7-bladed beta-propeller
Superfamily Superfamily superfamily	b.69.2 — YVTN repeat-like/Quinoprotein amine dehydrogenase
Family Family family	b.69.2.1 — Methylamine dehydrogenase, H-chain

Domain ID domain_id	d1mg2n_
Class class	g — Small proteins
Fold Fold fold	g.21 — Methylamine dehydrogenase, L chain
Superfamily Superfamily superfamily	g.21.1 — Methylamine dehydrogenase, L chain
Family Family family	g.21.1.1 — Methylamine dehydrogenase, L chain

Domain ID domain_id	d1mg2o_
Class class	b — All beta proteins
Fold Fold fold	b.6 — Cupredoxin-like
Superfamily Superfamily superfamily	b.6.1 — Cupredoxins
Family Family family	b.6.1.1 — Plastocyanin/azurin-like

Domain ID domain_id	d1mg2p_
Class class	a — All alpha proteins
Fold Fold fold	a.3 — Cytochrome c
Superfamily Superfamily superfamily	a.3.1 — Cytochrome c
Family Family family	a.3.1.1 — monodomain cytochrome c

CATH v4.4 (16 domains)

Domain ID domain_id	1mg2A00
Class class	2 — Mainly Beta
Architecture architecture	130 — 7 Propeller
Topology topology	10 — Methylamine Dehydrogenase; Chain H
Homologous superfamily homologous superfamily	10 — YVTN repeat-like/Quinoprotein amine dehydrogenase

Domain ID domain_id	1mg2B00
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	30 — Electron Transport Ethylamine Dehydrogenase
Homologous superfamily homologous superfamily	10 — Methylamine/Aralkylamine dehydrogenase light chain

Domain ID domain_id	1mg2C00
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	420 — Cupredoxins - blue copper proteins

Domain ID domain_id	1mg2D00
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	760 — Cytochrome Bc1 Complex; Chain D, domain 2
Homologous superfamily homologous superfamily	10 — Cytochrome c-like domain

Domain ID domain_id	1mg2E00
Class class	2 — Mainly Beta
Architecture architecture	130 — 7 Propeller
Topology topology	10 — Methylamine Dehydrogenase; Chain H
Homologous superfamily homologous superfamily	10 — YVTN repeat-like/Quinoprotein amine dehydrogenase

Domain ID domain_id	1mg2F00
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	30 — Electron Transport Ethylamine Dehydrogenase
Homologous superfamily homologous superfamily	10 — Methylamine/Aralkylamine dehydrogenase light chain

Domain ID domain_id	1mg2G00
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	420 — Cupredoxins - blue copper proteins

Domain ID domain_id	1mg2H00
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	760 — Cytochrome Bc1 Complex; Chain D, domain 2
Homologous superfamily homologous superfamily	10 — Cytochrome c-like domain

Domain ID domain_id	1mg2I00
Class class	2 — Mainly Beta
Architecture architecture	130 — 7 Propeller
Topology topology	10 — Methylamine Dehydrogenase; Chain H
Homologous superfamily homologous superfamily	10 — YVTN repeat-like/Quinoprotein amine dehydrogenase

Domain ID domain_id	1mg2J00
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	30 — Electron Transport Ethylamine Dehydrogenase
Homologous superfamily homologous superfamily	10 — Methylamine/Aralkylamine dehydrogenase light chain

Domain ID domain_id	1mg2K00
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	420 — Cupredoxins - blue copper proteins

Domain ID domain_id	1mg2L00
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	760 — Cytochrome Bc1 Complex; Chain D, domain 2
Homologous superfamily homologous superfamily	10 — Cytochrome c-like domain

Domain ID domain_id	1mg2M00
Class class	2 — Mainly Beta
Architecture architecture	130 — 7 Propeller
Topology topology	10 — Methylamine Dehydrogenase; Chain H
Homologous superfamily homologous superfamily	10 — YVTN repeat-like/Quinoprotein amine dehydrogenase

Domain ID domain_id	1mg2N00
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	30 — Electron Transport Ethylamine Dehydrogenase
Homologous superfamily homologous superfamily	10 — Methylamine/Aralkylamine dehydrogenase light chain

Domain ID domain_id	1mg2O00
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	420 — Cupredoxins - blue copper proteins

Domain ID domain_id	1mg2P00
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	760 — Cytochrome Bc1 Complex; Chain D, domain 2
Homologous superfamily homologous superfamily	10 — Cytochrome c-like domain

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Unit-cell length a length_a	79.122 Å
Unit-cell length b length_b	188.201 Å
Unit-cell length c length_c	127.100 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	99.24 °
Unit-cell angle γ angle_gamma	90.00 °
Molecules per unit cell Z z_pdb	8

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

Resolution resolution	2.250 Å
Low-resolution limit resolution_low	50.000 Å
R factor r_factor	—
R_work r_work	0.1730
R_free r_free	0.2100

MUTATION OF ALPHA PHE55 OF METHYLAMINE DEHYDROGENASE ALTERS THE REORGANIZATION ENERGY AND ELECTRONIC COUPLING FOR ITS ELECTRON TRANSFER REACTION WITH AMICYANIN

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

Methylamine dehydrogenase, heavy chain

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

Methylamine dehydrogenase, light chain

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

Amicyanin

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

CYTOCHROME C-L

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

1mg2__assembly_1__model_1

1mg2__assembly_1__model_1 | I(q)

1mg2__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 (9)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 polymer

Polymer Polymer

Source Source

Entity 3 Entity 3 polymer

Polymer Polymer

Source Source

Entity 4 Entity 4 polymer

Polymer Polymer

Source Source

Entity 5 Entity 5 non-polymer

Entity 6 Entity 6 non-polymer

Entity 7 Entity 7 non-polymer

Entity 8 Entity 8 non-polymer

Entity 9 Entity 9 water

6. Fold Classification (SCOP + CATH) 32 domains

SCOP 2.08 (16 domains)

CATH v4.4 (16 domains)

7. Citations (2)