SAXSdb — 1ddg

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

SULFITE REDUCTASE (NADPH) FLAVOPROTEIN ALPHA-COMPONENT

Escherichia coli

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein monomer	Monomer	Protein 1	FLAVIN-ADENINE DINUCLEOTIDE × 1 water × 1	Consistent with protein count
2	Protein monomer	Monomer	Protein 1	FLAVIN-ADENINE DINUCLEOTIDE × 1 SULFATE ION × 1 water × 1	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	CYSJ_ECOLI
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–374； UniProt 226–599 Author chain B； PDBConstruct 1–374； UniProt 226–599

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	1ddg
Deposition date deposition_date	1999-11-10
Structure title title	CRYSTAL STRUCTURE OF SIR-FP60
Keywords keywords	CYTOCHROME P450 REDUCTASE, FNR, FLAVOPROTEIN, MODULAR PROTEIN, 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.

1ddg__assembly_1__model_1

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

Download this curve (.dat)

1ddg__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

1ddg__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	23.96 Å
Rg (electron density)	23.17 Å
Total Rg	24.01 Å
Atom count	3041
Residues	374
Excluded volume	53588 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`1ddg__assembly_1__model_1`	monomeric （1）	Success	4.1.3-1-20251215 (887e7ef)	View Download
2	1	`1ddg__assembly_2__model_1`	monomeric （1）	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	SULFITE REDUCTASE (NADPH) FLAVOPROTEIN ALPHA-COMPONENT
Molecular weight formula_weight	42329.5 kDa
EC 编号 ec_number	1.8.1.2
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	6697

IHTSPYSKDAPLVASLSVNQKITGRNSEKDVRHIEIDLGDSGLRYQPGDALGVWYQNDPALVKELVELLWLKGDEPVTVEGKTLPLNEALQWHFELTVNTANIVENYATLTRSETLLPLVGDKAKLQHYAATTPIVDMVRFSPAQLDAEALINLLRPLTPRLYSIASSQAEVENEVHVTVGVVRYDVEGRARAGGASSFLADRVEEEGEVRVFIEHNDNFRLPANPETPVIMIGPGTGIAPFRAFMQQRAADEAPGKNWLFFGNPHFTEDFLYQVEWQRYVKEGVLTRIDLAWSRDQKEKVYVQDKLREQGAELWRWINDGAHIYVCGDANRMAKDVEQALLEVIAEFGGMDTEAADEFLSELRVERRYQRDVY

Source Source

Source organism organism	Escherichia coli
NCBI taxonomy ID ncbi_taxonomy_id	562
Host organism host_organism	Escherichia coli

Entity 2 Entity 2 non-polymer

Description description	FLAVIN-ADENINE DINUCLEOTIDE
Molecular weight formula_weight	785.5 kDa
Source method src_method	syn
Copy count entity_count	2

Entity 3 Entity 3 non-polymer

Description description	SULFATE ION
Molecular weight formula_weight	96.1 kDa
Source method src_method	syn
Copy count entity_count	1

Entity 4 Entity 4 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	548

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6. Fold Classification (SCOP + CATH) 10 domains

SCOP 2.08 (4 domains)

Domain ID domain_id	d1ddga1
Class class	b — All beta proteins
Fold Fold fold	b.43 — Reductase/isomerase/elongation factor common domain
Superfamily Superfamily superfamily	b.43.4 — Riboflavin synthase domain-like
Family Family family	b.43.4.1 — NADPH-cytochrome p450 reductase FAD-binding domain-like

Domain ID domain_id	d1ddga2
Class class	c — Alpha and beta proteins (a/b)
Fold Fold fold	c.25 — Ferredoxin reductase-like, C-terminal NADP-linked domain
Superfamily Superfamily superfamily	c.25.1 — Ferredoxin reductase-like, C-terminal NADP-linked domain
Family Family family	c.25.1.4 — NADPH-cytochrome p450 reductase-like

Domain ID domain_id	d1ddgb1
Class class	b — All beta proteins
Fold Fold fold	b.43 — Reductase/isomerase/elongation factor common domain
Superfamily Superfamily superfamily	b.43.4 — Riboflavin synthase domain-like
Family Family family	b.43.4.1 — NADPH-cytochrome p450 reductase FAD-binding domain-like

Domain ID domain_id	d1ddgb2
Class class	c — Alpha and beta proteins (a/b)
Fold Fold fold	c.25 — Ferredoxin reductase-like, C-terminal NADP-linked domain
Superfamily Superfamily superfamily	c.25.1 — Ferredoxin reductase-like, C-terminal NADP-linked domain
Family Family family	c.25.1.4 — NADPH-cytochrome p450 reductase-like

CATH v4.4 (6 domains)

Domain ID domain_id	1ddgA01
Class class	2 — Mainly Beta
Architecture architecture	40 — Beta Barrel
Topology topology	30 — Elongation Factor Tu (Ef-tu); domain 3
Homologous superfamily homologous superfamily	10 — Translation factors

Domain ID domain_id	1ddgA02
Class class	1 — Mainly Alpha
Architecture architecture	20 — Up-down Bundle
Topology topology	990 — NADPH-cytochrome p450 Reductase; Chain A, domain 3
Homologous superfamily homologous superfamily	10 — NADPH-cytochrome p450 Reductase; Chain A, domain 3

Domain ID domain_id	1ddgA03
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	50 — Rossmann fold
Homologous superfamily homologous superfamily	80 — Nucleotide-binding domain of ferredoxin-NADP reductase (FNR) module

Domain ID domain_id	1ddgB01
Class class	2 — Mainly Beta
Architecture architecture	40 — Beta Barrel
Topology topology	30 — Elongation Factor Tu (Ef-tu); domain 3
Homologous superfamily homologous superfamily	10 — Translation factors

Domain ID domain_id	1ddgB02
Class class	1 — Mainly Alpha
Architecture architecture	20 — Up-down Bundle
Topology topology	990 — NADPH-cytochrome p450 Reductase; Chain A, domain 3
Homologous superfamily homologous superfamily	10 — NADPH-cytochrome p450 Reductase; Chain A, domain 3

Domain ID domain_id	1ddgB03
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	50 — Rossmann fold
Homologous superfamily homologous superfamily	80 — Nucleotide-binding domain of ferredoxin-NADP reductase (FNR) module

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Unit-cell length a length_a	34.840 Å
Unit-cell length b length_b	82.540 Å
Unit-cell length c length_c	105.360 Å
Unit-cell angle α angle_alpha	79.71 °
Unit-cell angle β angle_beta	83.05 °
Unit-cell angle γ angle_gamma	89.90 °
Molecules per unit cell Z z_pdb	2

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

Resolution resolution	2.010 Å
Low-resolution limit resolution_low	10.000 Å
R factor r_factor	—
R_work r_work	—
R_free r_free	0.2890

CRYSTAL STRUCTURE OF SIR-FP60

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

SULFITE REDUCTASE (NADPH) FLAVOPROTEIN ALPHA-COMPONENT

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

1ddg__assembly_1__model_1

1ddg__assembly_1__model_1 | I(q)

1ddg__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 (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) 10 domains

SCOP 2.08 (4 domains)

CATH v4.4 (6 domains)

7. Citations (1)

CRYSTAL STRUCTURE OF SIR-FP60

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

SULFITE REDUCTASE (NADPH) FLAVOPROTEIN ALPHA-COMPONENT

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

1ddg__assembly_1__model_1

1ddg__assembly_1__model_1 | I(q)

1ddg__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 (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) 10 domains

SCOP 2.08 (4 domains)

CATH v4.4 (6 domains)

7. Citations (1)