1xme

Structure of Recombinant Cytochrome ba3 Oxidase from Thermus thermophilus

Method: X-RAY DIFFRACTION

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

Cytochrome c oxidase polypeptide I

Thermus thermophilus

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 3	Cytochrome c oxidase polypeptide II × 1 （P98052） Cytochrome c oxidase polypeptide IIA × 1 （P82543） nonyl beta-D-glucopyranoside × 1 COPPER (II) ION × 1 PROTOPORPHYRIN IX CONTAINING FE × 1 HEME-AS × 1 GLYCEROL × 1 DINUCLEAR COPPER ION × 1 water × 2	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	COX1_THETH
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 8–568； UniProt 2–562

Cytochrome c oxidase polypeptide II

Thermus thermophilus

UniProt P98052

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 3	Cytochrome c oxidase polypeptide I × 1 （Q56408） Cytochrome c oxidase polypeptide IIA × 1 （P82543） nonyl beta-D-glucopyranoside × 1 COPPER (II) ION × 1 PROTOPORPHYRIN IX CONTAINING FE × 1 HEME-AS × 1 GLYCEROL × 1 DINUCLEAR COPPER ION × 1 water × 2	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	COX2_THETH
Isoform	—
PDB entities	2
Chains and sequence ranges	Author chain B； PDBConstruct 1–168； UniProt 1–168

Cytochrome c oxidase polypeptide IIA

Thermus thermophilus

UniProt P82543

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 3	Cytochrome c oxidase polypeptide I × 1 （Q56408） Cytochrome c oxidase polypeptide II × 1 （P98052） nonyl beta-D-glucopyranoside × 1 COPPER (II) ION × 1 PROTOPORPHYRIN IX CONTAINING FE × 1 HEME-AS × 1 GLYCEROL × 1 DINUCLEAR COPPER ION × 1 water × 2	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	COXA_THET8
Isoform	—
PDB entities	3
Chains and sequence ranges	Author chain C； PDBConstruct 1–34； UniProt 1–34

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	1xme
Deposition date deposition_date	2004-10-01
Structure title title	Structure of Recombinant Cytochrome ba3 Oxidase from Thermus thermophilus
Keywords keywords	cytochrome oxidase, heme, heme-as, integral membrane 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.

1xme__assembly_1__model_1

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

Download this curve (.dat)

1xme__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

1xme__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	27.17 Å
Rg (electron density)	25.84 Å
Total Rg	26.83 Å
Atom count	6102
Residues	756
Excluded volume	111860 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`1xme__assembly_1__model_1`	trimeric （3）	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 polypeptide I
Molecular weight formula_weight	63402.0 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	6177

MHHHHHHAVRASEISRVYEAYPEKKATLYFLVLGFLALIVGSLFGPFQALNYGNVDAYPLLKRLLPFVQSYYQGLTLHGVLNAIVFTQLFAQAIMVYLPARELNMRPNMGLMWLSWWMAFIGLVVAALPLLANEATVLYTFYPPLKGHWAFYLGASVFVLSTWVSIYIVLDLWRRWKAANPGKVTPLVTYMAVVFWLMWFLASLGLVLEAVLFLLPWSFGLVEGVDPLVARTLFWWTGHPIVYFWLLPAYAIIYTILPKQAGGKLVSDPMARLAFLLFLLLSTPVGFHHQFADPGIDPTWKMIHSVLTLFVAVPSLMTAFTVAASLEFAGRLRGGRGLFGWIRALPWDNPAFVAPVLGLLGFIPGGAGGIVNASFTLDYVVHNTAWVPGHFHLQVASLVTLTAMGSLYWLLPNLTGKPISDAQRRLGLAVVWLWFLGMMIMAVGLHWAGLLNVPRRAYIAQVPDAYPHAAVPMVFNVLAGIVLLVALLLFIYGLFSVLLSRERKPELAEAPLPFAEVISGPEDRRLVLAMDRIGFWFAVAAILVVLAYGPTLVQLFGHLNPVPGWRLW

Source Source

Source organism organism	Thermus thermophilus
NCBI taxonomy ID ncbi_taxonomy_id	274
Host organism host_organism	Thermus thermophilus HB8

Entity 2 Entity 2 polymer

Description description	Cytochrome c oxidase polypeptide II
Molecular weight formula_weight	18581.3 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

MVDEHKAHKAILAYEKGWLAFSLAMLFVFIALIAYTLATHTAGVIPAGKLERVDPTTVRQEGPWADPAQAVVQTGPNQYTVYVLAFAFGYQPNPIEVPQGAEIVFKITSPDVIHGFHVEGTNINVEVLPGEVSTVRYTFKRPGEYRIICNQYCGLGHQNMFGTIVVKE

Source Source

Source organism organism	Thermus thermophilus
NCBI taxonomy ID ncbi_taxonomy_id	274
Host organism host_organism	Thermus thermophilus HB8

Entity 3 Entity 3 polymer

Description description	Cytochrome c oxidase polypeptide IIA
Molecular weight formula_weight	3769.6 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	C

MEEKPKGALAVILVLTLTILVFWLGVYAVFFARG

Source Source

Source organism organism	Thermus thermophilus
NCBI taxonomy ID ncbi_taxonomy_id	274
Host organism host_organism	Thermus thermophilus HB8

Entity 4 Entity 4 non-polymer

Description description	nonyl beta-D-glucopyranoside
Molecular weight formula_weight	306.4 kDa
Source method src_method	man
Copy count entity_count	1

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	1

Entity 6 Entity 6 non-polymer

Description description	PROTOPORPHYRIN IX CONTAINING FE
Molecular weight formula_weight	616.5 kDa
Source method src_method	syn
Copy count entity_count	1

Entity 7 Entity 7 non-polymer

Description description	HEME-AS
Molecular weight formula_weight	921.0 kDa
Source method src_method	syn
Copy count entity_count	1

Entity 8 Entity 8 non-polymer

Description description	GLYCEROL
Molecular weight formula_weight	92.1 kDa
Source method src_method	syn
Copy count entity_count	1

Entity 9 Entity 9 non-polymer

Description description	DINUCLEAR COPPER ION
Molecular weight formula_weight	127.1 kDa
Source method src_method	syn
Copy count entity_count	1

Entity 10 Entity 10 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	75

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6. Fold Classification (SCOP + CATH) 7 domains

SCOP 2.08 (4 domains)

Domain ID domain_id	d1xmea_
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	d1xmeb1
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	d1xmeb2
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	d1xmec_
Class class	f — Membrane and cell surface proteins and peptides
Fold Fold fold	f.23 — Single transmembrane helix
Superfamily Superfamily superfamily	f.23.9 — Bacterial ba3 type cytochrome c oxidase subunit IIa
Family Family family	f.23.9.1 — Bacterial ba3 type cytochrome c oxidase subunit IIa

CATH v4.4 (3 domains)

Domain ID domain_id	1xmeA00
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	1xmeB01
Class class	1 — Mainly Alpha
Architecture architecture	20 — Up-down Bundle
Topology topology	1070 — Rhopdopsin 7-helix transmembrane proteins
Homologous superfamily homologous superfamily	10 — Rhodopsin 7-helix transmembrane proteins

Domain ID domain_id	1xmeB02
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	420 — Cupredoxins - blue copper proteins

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Unit-cell length a length_a	114.902 Å
Unit-cell length b length_b	114.902 Å
Unit-cell length c length_c	177.064 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	8

Space group space_group	P 43 21 2
Space-group number int_tables_number	96
Crystal system crystal_system	—

Resolution resolution	2.300 Å
Low-resolution limit resolution_low	21.420 Å
R factor r_factor	0.2170
R_work r_work	0.2170
R_free r_free	0.2360

Structure of Recombinant Cytochrome ba3 Oxidase from Thermus thermophilus

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

Cytochrome c oxidase polypeptide I

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 polypeptide II

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 polypeptide IIA

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

1xme__assembly_1__model_1

1xme__assembly_1__model_1 | I(q)

1xme__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 non-polymer

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) 7 domains

SCOP 2.08 (4 domains)

CATH v4.4 (3 domains)

7. Citations (1)