1ar1

Structure at 2.7 Angstrom Resolution of the Paracoccus Denitrificans two-subunit Cytochrome C Oxidase Complexed with an Antibody Fv Fragment

Method: X-RAY DIFFRACTION

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

CYTOCHROME C OXIDASE

Paracoccus denitrificans

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 4	CYTOCHROME C OXIDASE × 1 （P08306） ANTIBODY FV FRAGMENT × 1 ANTIBODY FV FRAGMENT × 1 COPPER (II) ION × 3 MAGNESIUM ION × 1 CALCIUM ION × 1 HEME-A × 2 LAURYL DIMETHYLAMINE-N-OXIDE × 9 water × 4	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	CX1B_PARDE
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–558； UniProt 1–558

CYTOCHROME C OXIDASE

Paracoccus denitrificans

UniProt P08306

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 4	CYTOCHROME C OXIDASE × 1 （P98002） ANTIBODY FV FRAGMENT × 1 ANTIBODY FV FRAGMENT × 1 COPPER (II) ION × 3 MAGNESIUM ION × 1 CALCIUM ION × 1 HEME-A × 2 LAURYL DIMETHYLAMINE-N-OXIDE × 9 water × 4	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	COX2_PARDE
Isoform	—
PDB entities	2
Chains and sequence ranges	Author chain B； PDBConstruct 1–298； UniProt 1–298

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	1ar1
Deposition date deposition_date	1997-08-08
Structure title title	Structure at 2.7 Angstrom Resolution of the Paracoccus Denitrificans two-subunit Cytochrome C Oxidase Complexed with an Antibody Fv Fragment
Keywords keywords	;COMPLEX (OXIDOREDUCTASE-ANTIBODY), ELECTRON TRANSPORT, TRANSMEMBRANE, CYTOCHROME OXIDASE, ANTIBODY COMPLEX, COMPLEX (OXIDOREDUCTASE-ANTIBODY) complex ;; COMPLEX (OXIDOREDUCTASE/ANTIBODY)
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.

1ar1__assembly_1__model_1

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

Download this curve (.dat)

1ar1__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

1ar1__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	33.85 Å
Rg (electron density)	33.13 Å
Total Rg	33.64 Å
Atom count	8191
Residues	1007
Excluded volume	148940 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`1ar1__assembly_1__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 (10)

Entity 1 Entity 1 polymer

Description description	CYTOCHROME C OXIDASE
Molecular weight formula_weight	62486.6 kDa
EC 编号 ec_number	1.9.3.1
Source method src_method	man
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A
Atom count atom_count	8243

MADAAVHGHGDHHDTRGFFTRWFMSTNHKDIGILYLFTAGIVGLISVCFTVYMRMELQHPGVQYMCLEGARLIADASAECTPNGHLWNVMITYHGVLMMFFVVIPALFGGFGNYFMPLHIGAPDMAFPRLNNLSYWMYVCGVALGVASLLAPGGNDQMGSGVGWVLYPPLSTTEAGYSMDLAIFAVHVSGASSILGAINIITTFLNMRAPGMTLFKVPLFAWSVFITAWLILLSLPVLAGAITMLLMDRNFGTQFFDPAGGGDPVLYQHILWFFGHPEVYIIILPGFGIISHVISTFAKKPIFGYLPMVLAMAAIGILGFVVWAHHMYTAGMSLTQQAYFMLATMTIAVPTGIKVFSWIATMWGGSIEFKTPMLWAFGFLFLFTVGGVTGVVLSQAPLDRVYHDTYYVVAHFHYVMSLGAVFGIFAGVYYWIGKMSGRQYPEWAGQLHFWMMFIGSNLIFFPQHFLGRQGMPRRYIDYPVEFAYWNNISSIGAYISFASFLFFIGIVFYTLFAGKRVNVPNYWNEHADTLEWTLPSPPPEHTFETLPKREDWDRAHAH

Source Source

Source organism organism	Paracoccus denitrificans
NCBI taxonomy ID ncbi_taxonomy_id	266
Host organism host_organism	Escherichia coli

Entity 2 Entity 2 polymer

Description description	CYTOCHROME C OXIDASE
Molecular weight formula_weight	32563.6 kDa
EC 编号 ec_number	1.9.3.1
Source method src_method	man
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	B

MMAIATKRRGVAAVMSLGVATMTAVPALAQDVLGDLPVIGKPVNGGMNFQPASSPLAHDQQWLDHFVLYIITAVTIFVCLLLLICIVRFNRRANPVPARFTHNTPIEVIWTLVPVLILVAIGAFSLPILFRSQEMPNDPDLVIKAIGHQWYWSYEYPNDGVAFDALMLEKEALADAGYSEDEYLLATDNPVVVPVGKKVLVQVTATDVIHAWTIPAFAVKQDAVPGRIAQLWFSVDQEGVYFGQCSELCGINHAYMPIVVKAVSQEKYEAWLAGAKEEFAADASDYLPASPVKLASAE

Source Source

Source organism organism	Paracoccus denitrificans
NCBI taxonomy ID ncbi_taxonomy_id	266
Host organism host_organism	Escherichia coli

Entity 3 Entity 3 polymer

Description description	ANTIBODY FV FRAGMENT
Molecular weight formula_weight	14324.9 kDa
Source method src_method	man
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	C

EVKLQESGGDLVQPGGSLKLSCAASGFTFSSYTMSWVRQTPEKRLEWVASINNGGGRTYYPDTVKGRFTISRDNAKNTLYLQMSSLKSEDTAMYYCVRHEYYYAMDYWGQGTTVTVSSAWRHPQFGG

Source Source

Source organism organism	Mus musculus
Common name common_name	house mouse
NCBI taxonomy ID ncbi_taxonomy_id	10090
Host organism host_organism	Escherichia coli

Entity 4 Entity 4 polymer

Description description	ANTIBODY FV FRAGMENT
Molecular weight formula_weight	13260.8 kDa
Source method src_method	man
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	D

DIELTQTPVSLSASVGETVTITCRASENIYSYLAWYQQKQGKSPQFLVYNAKTLGEGVPSRFSGSGSGTQFSLKINSLLPEDFGSYYCQHHYGTPPLTFGGGTKLEIKREQKLISEEDLM

Source Source

Source organism organism	Mus musculus
Common name common_name	house mouse
NCBI taxonomy ID ncbi_taxonomy_id	10090
Host organism host_organism	Escherichia coli

Entity 5 Entity 5 non-polymer

Description description	COPPER (II) ION
Molecular weight formula_weight	63.5 kDa
Source method src_method	syn
Copy count entity_count	3

Entity 6 Entity 6 non-polymer

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

Entity 7 Entity 7 non-polymer

Description description	CALCIUM ION
Molecular weight formula_weight	40.1 kDa
Source method src_method	syn
Copy count entity_count	1

Entity 8 Entity 8 non-polymer

Description description	HEME-A
Molecular weight formula_weight	852.8 kDa
Source method src_method	syn
Copy count entity_count	2

Entity 9 Entity 9 non-polymer

Description description	LAURYL DIMETHYLAMINE-N-OXIDE
Molecular weight formula_weight	229.4 kDa
Source method src_method	syn
Copy count entity_count	9

Entity 10 Entity 10 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	52

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6. Fold Classification (SCOP + CATH) 10 domains

SCOP 2.08 (5 domains)

Domain ID domain_id	d1ar1a_
Class class	f — Membrane and cell surface proteins and peptides
Fold Fold fold	f.24 — Cytochrome c oxidase subunit I-like
Superfamily Superfamily superfamily	f.24.1 — Cytochrome c oxidase subunit I-like
Family Family family	f.24.1.1 — Cytochrome c oxidase subunit I-like

Domain ID domain_id	d1ar1b1
Class class	b — All beta proteins
Fold Fold fold	b.6 — Cupredoxin-like
Superfamily Superfamily superfamily	b.6.1 — Cupredoxins
Family Family family	b.6.1.2 — Periplasmic domain of cytochrome c oxidase subunit II

Domain ID domain_id	d1ar1b2
Class class	f — Membrane and cell surface proteins and peptides
Fold Fold fold	f.17 — Transmembrane helix hairpin
Superfamily Superfamily superfamily	f.17.2 — Cytochrome c oxidase subunit II-like, transmembrane region
Family Family family	f.17.2.1 — Cytochrome c oxidase subunit II-like, transmembrane region

Domain ID domain_id	d1ar1c_
Class class	b — All beta proteins
Fold Fold fold	b.1 — Immunoglobulin-like beta-sandwich
Superfamily Superfamily superfamily	b.1.1 — Immunoglobulin
Family Family family	b.1.1.1 — V set domains (antibody variable domain-like)

Domain ID domain_id	d1ar1d_
Class class	b — All beta proteins
Fold Fold fold	b.1 — Immunoglobulin-like beta-sandwich
Superfamily Superfamily superfamily	b.1.1 — Immunoglobulin
Family Family family	b.1.1.1 — V set domains (antibody variable domain-like)

CATH v4.4 (5 domains)

Domain ID domain_id	1ar1A00
Class class	1 — Mainly Alpha
Architecture architecture	20 — Up-down Bundle
Topology topology	210 — Cytochrome C Oxidase; Chain A
Homologous superfamily homologous superfamily	10 — Cytochrome c oxidase-like, subunit I domain

Domain ID domain_id	1ar1B01
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	1ar1B02
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	287 — Helix Hairpins
Homologous superfamily homologous superfamily	90 —

Domain ID domain_id	1ar1C00
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	10 — Immunoglobulins

Domain ID domain_id	1ar1D00
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	10 — Immunoglobulins

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Unit-cell length a length_a	93.500 Å
Unit-cell length b length_b	151.000 Å
Unit-cell length c length_c	156.700 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	4

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

Resolution resolution	2.700 Å
Low-resolution limit resolution_low	30.000 Å
R factor r_factor	0.2070
R_work r_work	0.2070
R_free r_free	0.2610

Structure at 2.7 Angstrom Resolution of the Paracoccus Denitrificans two-subunit Cytochrome C Oxidase Complexed with an Antibody Fv Fragment

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

CYTOCHROME C OXIDASE

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 OXIDASE

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

1ar1__assembly_1__model_1

1ar1__assembly_1__model_1 | I(q)

1ar1__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 (10)

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 non-polymer

Entity 10 Entity 10 water

6. Fold Classification (SCOP + CATH) 10 domains

SCOP 2.08 (5 domains)

CATH v4.4 (5 domains)

7. Citations (1)