1fcd

THE STRUCTURE OF FLAVOCYTOCHROME C SULFIDE DEHYDROGENASE FROM A PURPLE PHOTOTROPHIC BACTERIUM CHROMATIUM VINOSUM AT 2.5 ANGSTROMS RESOLUTION

Method: X-RAY DIFFRACTION

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

FLAVOCYTOCHROME C SULFIDE DEHYDROGENASE (FLAVIN-BINDING SUBUNIT)

Allochromatium vinosum

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 2	FLAVOCYTOCHROME C SULFIDE DEHYDROGENASE (CYTOCHROME SUBUNIT) × 1 （Q06529） FLAVIN-ADENINE DINUCLEOTIDE × 1 HEME C × 2	Consistent with protein count
2	Protein heterocomplex	Heteromer	Protein 2	FLAVOCYTOCHROME C SULFIDE DEHYDROGENASE (CYTOCHROME SUBUNIT) × 1 （Q06529） FLAVIN-ADENINE DINUCLEOTIDE × 1 HEME C × 2	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	DHSU_CHRVI
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–401； UniProt 31–431 Author chain B； PDBConstruct 1–401； UniProt 31–431

FLAVOCYTOCHROME C SULFIDE DEHYDROGENASE (CYTOCHROME SUBUNIT)

Allochromatium vinosum

UniProt Q06529

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 2	FLAVOCYTOCHROME C SULFIDE DEHYDROGENASE (FLAVIN-BINDING SUBUNIT) × 1 （Q06530） FLAVIN-ADENINE DINUCLEOTIDE × 1 HEME C × 2	Consistent with protein count
2	Protein heterocomplex	Heteromer	Protein 2	FLAVOCYTOCHROME C SULFIDE DEHYDROGENASE (FLAVIN-BINDING SUBUNIT) × 1 （Q06530） FLAVIN-ADENINE DINUCLEOTIDE × 1 HEME C × 2	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	CYSD_CHRVI
Isoform	—
PDB entities	2
Chains and sequence ranges	Author chain C； PDBConstruct 1–174； UniProt 26–199 Author chain D； PDBConstruct 1–174； UniProt 26–199

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	1fcd
Deposition date deposition_date	1994-08-18
Structure title title	THE STRUCTURE OF FLAVOCYTOCHROME C SULFIDE DEHYDROGENASE FROM A PURPLE PHOTOTROPHIC BACTERIUM CHROMATIUM VINOSUM AT 2.5 ANGSTROMS RESOLUTION
Keywords keywords	ELECTRON TRANSPORT(FLAVOCYTOCHROME); ELECTRON TRANSPORT(FLAVOCYTOCHROME)
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.

1fcd__assembly_1__model_1

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

Download this curve (.dat)

1fcd__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

1fcd__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	25.67 Å
Rg (electron density)	24.85 Å
Total Rg	25.75 Å
Atom count	4501
Residues	575
Excluded volume	79736 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`1fcd__assembly_1__model_1`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download
2	1	`1fcd__assembly_2__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	FLAVOCYTOCHROME C SULFIDE DEHYDROGENASE (FLAVIN-BINDING SUBUNIT)
Molecular weight formula_weight	42844.2 kDa
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	9002

AGRKVVVVGGGTGGATAAKYIKLADPSIEVTLIEPNTDYYTCYLSNEVIGGDRKLESIKHGYDGLRAHGIQVVHDSATGIDPDKKLVKTAGGAEFGYDRCVVAPGIELIYDKIEGYSEEAAAKLPHAWKAGEQTAILRKQLEDMADGGTVVIAPPAAPFRCPPGPYERASQVAYYLKAHKPMSKVIILDSSQTFSKQSQFSKGWERLYGFGTENAMIEWHPGPDSAVVKVDGGEMMVETAFGDEFKADVINLIPPQRAGKIAQIAGLTNDAGWCPVDIKTFESSIHKGIHVIGDASIANPMPKSGYSANSQGKVAAAAVVVLLKGEEPGTPSYLNTCYSILAPAYGISVAAIYRPNADGSAIESVPDSGGVTPVDAPDWVLEREVQYAYSWYNNIVHDTFG

Source Source

Source organism organism	Allochromatium vinosum
NCBI taxonomy ID ncbi_taxonomy_id	1049

Entity 2 Entity 2 polymer

Description description	FLAVOCYTOCHROME C SULFIDE DEHYDROGENASE (CYTOCHROME SUBUNIT)
Molecular weight formula_weight	19231.7 kDa
Source method src_method	man
Copy count entity_count	2

Polymer Polymer

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

EPTAEMLTNNCAGCHGTHGNSVGPASPSIAQMDPMVFVEVMEGFKSGEIASTIMGRIAKGYSTADFEKMAGYFKQQTYQPAKQSFDTALADTGAKLHDKYCEKCHVEGGKPLADEEDYHILAGQWTPYLQYAMSDFREERRPMEKKMASKLRELLKAEGDAGLDALFAFYASQQ

Source Source

Source organism organism	Allochromatium vinosum
NCBI taxonomy ID ncbi_taxonomy_id	1049

Entity 3 Entity 3 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 4 Entity 4 non-polymer

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

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6. Fold Classification (SCOP + CATH) 20 domains

SCOP 2.08 (10 domains)

Domain ID domain_id	d1fcda1
Class class	c — Alpha and beta proteins (a/b)
Fold Fold fold	c.3 — FAD/NAD(P)-binding domain
Superfamily Superfamily superfamily	c.3.1 — FAD/NAD(P)-binding domain
Family Family family	c.3.1.5 — FAD/NAD-linked reductases, N-terminal and central domains

Domain ID domain_id	d1fcda2
Class class	c — Alpha and beta proteins (a/b)
Fold Fold fold	c.3 — FAD/NAD(P)-binding domain
Superfamily Superfamily superfamily	c.3.1 — FAD/NAD(P)-binding domain
Family Family family	c.3.1.5 — FAD/NAD-linked reductases, N-terminal and central domains

Domain ID domain_id	d1fcda3
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.87 — CO dehydrogenase flavoprotein C-domain-like
Superfamily Superfamily superfamily	d.87.1 — FAD/NAD-linked reductases, dimerisation (C-terminal) domain
Family Family family	d.87.1.1 — FAD/NAD-linked reductases, dimerisation (C-terminal) domain

Domain ID domain_id	d1fcdb1
Class class	c — Alpha and beta proteins (a/b)
Fold Fold fold	c.3 — FAD/NAD(P)-binding domain
Superfamily Superfamily superfamily	c.3.1 — FAD/NAD(P)-binding domain
Family Family family	c.3.1.5 — FAD/NAD-linked reductases, N-terminal and central domains

Domain ID domain_id	d1fcdb2
Class class	c — Alpha and beta proteins (a/b)
Fold Fold fold	c.3 — FAD/NAD(P)-binding domain
Superfamily Superfamily superfamily	c.3.1 — FAD/NAD(P)-binding domain
Family Family family	c.3.1.5 — FAD/NAD-linked reductases, N-terminal and central domains

Domain ID domain_id	d1fcdb3
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.87 — CO dehydrogenase flavoprotein C-domain-like
Superfamily Superfamily superfamily	d.87.1 — FAD/NAD-linked reductases, dimerisation (C-terminal) domain
Family Family family	d.87.1.1 — FAD/NAD-linked reductases, dimerisation (C-terminal) domain

Domain ID domain_id	d1fcdc1
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.3.1.4 — Two-domain cytochrome c

Domain ID domain_id	d1fcdc2
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.3.1.4 — Two-domain cytochrome c

Domain ID domain_id	d1fcdd1
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.3.1.4 — Two-domain cytochrome c

Domain ID domain_id	d1fcdd2
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.3.1.4 — Two-domain cytochrome c

CATH v4.4 (10 domains)

Domain ID domain_id	1fcdA01
Class class	3 — Alpha Beta
Architecture architecture	50 — 3-Layer(bba) Sandwich
Topology topology	50 — FAD/NAD(P)-binding domain
Homologous superfamily homologous superfamily	60 — FAD/NAD(P)-binding domain

Domain ID domain_id	1fcdA02
Class class	3 — Alpha Beta
Architecture architecture	50 — 3-Layer(bba) Sandwich
Topology topology	50 — FAD/NAD(P)-binding domain
Homologous superfamily homologous superfamily	60 — FAD/NAD(P)-binding domain

Domain ID domain_id	1fcdA03
Class class	3 — Alpha Beta
Architecture architecture	90 — Alpha-Beta Complex
Topology topology	760 — Flavocytochrome C Sulfide Dehydrogenase; Chain A Domain 3
Homologous superfamily homologous superfamily	10 — Flavocytochrome c sulphide dehydrogenase, flavin-binding domain

Domain ID domain_id	1fcdB01
Class class	3 — Alpha Beta
Architecture architecture	50 — 3-Layer(bba) Sandwich
Topology topology	50 — FAD/NAD(P)-binding domain
Homologous superfamily homologous superfamily	60 — FAD/NAD(P)-binding domain

Domain ID domain_id	1fcdB02
Class class	3 — Alpha Beta
Architecture architecture	50 — 3-Layer(bba) Sandwich
Topology topology	50 — FAD/NAD(P)-binding domain
Homologous superfamily homologous superfamily	60 — FAD/NAD(P)-binding domain

Domain ID domain_id	1fcdB03
Class class	3 — Alpha Beta
Architecture architecture	90 — Alpha-Beta Complex
Topology topology	760 — Flavocytochrome C Sulfide Dehydrogenase; Chain A Domain 3
Homologous superfamily homologous superfamily	10 — Flavocytochrome c sulphide dehydrogenase, flavin-binding domain

Domain ID domain_id	1fcdC01
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	1fcdC02
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	1fcdD01
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	1fcdD02
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	168.600 Å
Unit-cell length b length_b	84.600 Å
Unit-cell length c length_c	106.400 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	107.00 °
Unit-cell angle γ angle_gamma	90.00 °
Molecules per unit cell Z z_pdb	8

Space group space_group	C 1 2 1
Space-group number int_tables_number	5
Crystal system crystal_system	—

Resolution resolution	2.530 Å
Low-resolution limit resolution_low	— Å
R factor r_factor	0.2370
R_work r_work	0.2370
R_free r_free	—

THE STRUCTURE OF FLAVOCYTOCHROME C SULFIDE DEHYDROGENASE FROM A PURPLE PHOTOTROPHIC BACTERIUM CHROMATIUM VINOSUM AT 2.5 ANGSTROMS RESOLUTION

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

FLAVOCYTOCHROME C SULFIDE DEHYDROGENASE (FLAVIN-BINDING SUBUNIT)

State in the Current Structure

Other States of the Same Protein in the Database

FLAVOCYTOCHROME C SULFIDE DEHYDROGENASE (CYTOCHROME SUBUNIT)

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

1fcd__assembly_1__model_1

1fcd__assembly_1__model_1 | I(q)

1fcd__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 polymer

Polymer Polymer

Source Source

Entity 3 Entity 3 non-polymer

Entity 4 Entity 4 non-polymer

6. Fold Classification (SCOP + CATH) 20 domains

SCOP 2.08 (10 domains)

CATH v4.4 (10 domains)

7. Citations (3)

THE STRUCTURE OF FLAVOCYTOCHROME C SULFIDE DEHYDROGENASE FROM A PURPLE PHOTOTROPHIC BACTERIUM CHROMATIUM VINOSUM AT 2.5 ANGSTROMS RESOLUTION

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

FLAVOCYTOCHROME C SULFIDE DEHYDROGENASE (FLAVIN-BINDING SUBUNIT)

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

FLAVOCYTOCHROME C SULFIDE DEHYDROGENASE (CYTOCHROME SUBUNIT)

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

1fcd__assembly_1__model_1

1fcd__assembly_1__model_1 | I(q)

1fcd__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 polymer

Polymer Polymer

Source Source

Entity 3 Entity 3 non-polymer

Entity 4 Entity 4 non-polymer

6. Fold Classification (SCOP + CATH) 20 domains

SCOP 2.08 (10 domains)

CATH v4.4 (10 domains)

7. Citations (3)