6dc6

Crystal structure of human ubiquitin activating enzyme E1 (Uba1) in complex with ubiquitin

Method: X-RAY DIFFRACTION

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

Ubiquitin-like modifier-activating enzyme 1

Homo sapiens

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 2	Ubiquitin × 1 （P62979） MAGNESIUM ION × 2 PYROPHOSPHATE 2- × 1	Consistent with protein count
2	Protein heterocomplex	Heteromer	Protein 2	Ubiquitin × 1 （P62979） MAGNESIUM ION × 2 PYROPHOSPHATE 2- × 1	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	UBA1_HUMAN
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 6–1015； UniProt 49–1058 Author chain C； PDBConstruct 6–1015； UniProt 49–1058

Ubiquitin

Homo sapiens

UniProt P62979

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 2	Ubiquitin-like modifier-activating enzyme 1 × 1 （P22314） MAGNESIUM ION × 2 PYROPHOSPHATE 2- × 1	Consistent with protein count
2	Protein heterocomplex	Heteromer	Protein 2	Ubiquitin-like modifier-activating enzyme 1 × 1 （P22314） MAGNESIUM ION × 2 PYROPHOSPHATE 2- × 1	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	RS27A_HUMAN
Isoform	—
PDB entities	2
Chains and sequence ranges	Author chain B； PDBConstruct 5–80； UniProt 1–76 Author chain D； PDBConstruct 5–80； UniProt 1–76

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	6dc6
Deposition date deposition_date	2018-05-04
Structure title title	Crystal structure of human ubiquitin activating enzyme E1 (Uba1) in complex with ubiquitin
Keywords keywords	Ubiquitin, E1, adenylation, thioester bond, E2, transthiolation, SIGNALING PROTEIN, SIGNALING PROTEIN-LIGASE complex; SIGNALING PROTEIN/LIGASE
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.

6dc6__assembly_1__model_1

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

Download this curve (.dat)

6dc6__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

6dc6__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	33.81 Å
Rg (electron density)	32.89 Å
Total Rg	33.45 Å
Atom count	8432
Residues	1068
Excluded volume	149910 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`6dc6__assembly_1__model_1`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download
2	1	`6dc6__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	Ubiquitin-like modifier-activating enzyme 1
Molecular weight formula_weight	113504.7 kDa
EC 编号 ec_number	6.2.1.45
Mutation mutation	C632A
Source method src_method	man
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,C
Atom count atom_count	16888

GAMGSDIDEGLYSRQLYVLGHEAMKRLQTSSVLVSGLRGLGVEIAKNIILGGVKAVTLHDQGTAQWADLSSQFYLREEDIGKNRAEVSQPRLAELNSYVPVTAYTGPLVEDFLSGFQVVVLTNTPLEDQLRVGEFCHNRGIKLVVADTRGLFGQLFCDFGEEMILTDSNGEQPLSAMVSMVTKDNPGVVTCLDEARHGFESGDFVSFSEVQGMVELNGNQPMEIKVLGPYTFSICDTSNFSDYIRGGIVSQVKVPKKISFKSLVASLAEPDFVVTDFAKFSRPAQLHIGFQALHQFCAQHGRPPRPRNEEDAAELVALAQAVNARALPAVQQNNLDEDLIRKLAYVAAGDLAPINAFIGGLAAQEVMKACSGKFMPIMQWLYFDALECLPEDKEVLTEDKCLQRQNRYDGQVAVFGSDLQEKLGKQKYFLVGAGAIGCELLKNFAMIGLGCGEGGEIIVTDMDTIEKSNLNRQFLFRPWDVTKLKSDTAAAAVRQMNPHIRVTSHQNRVGPDTERIYDDDFFQNLDGVANALDNVDARMYMDRRCVYYRKPLLESGTLGTKGNVQVVIPFLTESYSSSQDPPEKSIPIATLKNFPNAIEHTLQWARDEFEGLFKQPAENVNQYLTDPKFVERTLRLAGTQPLEVLEAVQRSLVLQRPQTWADCVTWACHHWHTQYSNNIRQLLHNFPPDQLTSSGAPFWSGPKRCPHPLTFDVNNPLHLDYVMAAANLFAQTYGLTGSQDRAAVATFLQSVQVPEFTPKSGVKIHVSDQELQSANASVDDSRLEELKATLPSPDKLPGFKMYPIDFEKDDDSNFHMDFIVAASNLRAENYDIPSADRHKSKLIAGKIIPAIATTTAAVVGLVCLELYKVVQGHRQLDSYKNGFLNLALPFFGFSEPLAAPRHQYYNQEWTLWDRFEVQGLQPNGEEMTLKQFLDYFKTEHKLEITMLSQGVSMLYSFFMPAAKLKERLDQPMTEIVSRVSKRKLGRHVRALVLELCCNDESGEDVEVPYVRYTIR

Source Source

Source organism organism	Homo sapiens
Common name common_name	Human
NCBI taxonomy ID ncbi_taxonomy_id	9606
Host organism host_organism	Escherichia coli

Entity 2 Entity 2 polymer

Description description	Ubiquitin
Molecular weight formula_weight	8907.2 kDa
Source method src_method	man
Copy count entity_count	2

Polymer Polymer

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

GAMAMQIFVKTLTGKTITLEVEPSDTIENVKAKIQDKEGIPPDQQRLIFAGKQLEDGRTLSDYNIQKESTLHLVLRLRGG

Source Source

Source organism organism	Homo sapiens
Common name common_name	Human
NCBI taxonomy ID ncbi_taxonomy_id	9606
Host organism host_organism	Escherichia coli

Entity 3 Entity 3 non-polymer

Description description	MAGNESIUM ION
Molecular weight formula_weight	24.3 kDa
Source method src_method	syn
Copy count entity_count	4

Entity 4 Entity 4 non-polymer

Description description	PYROPHOSPHATE 2-
Molecular weight formula_weight	176.0 kDa
Source method src_method	syn
Copy count entity_count	2

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6. Fold Classification (SCOP + CATH) 14 domains

SCOP 2.08 (2 domains)

Domain ID domain_id	d6dc6b_
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.15 — beta-Grasp (ubiquitin-like)
Superfamily Superfamily superfamily	d.15.1 — Ubiquitin-like
Family Family family	d.15.1.1 — Ubiquitin-related

Domain ID domain_id	d6dc6d_
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.15 — beta-Grasp (ubiquitin-like)
Superfamily Superfamily superfamily	d.15.1 — Ubiquitin-like
Family Family family	d.15.1.1 — Ubiquitin-related

CATH v4.4 (12 domains)

Domain ID domain_id	6dc6A01
Class class	3 — Alpha Beta
Architecture architecture	50 — 3-Layer(bba) Sandwich
Topology topology	50 — FAD/NAD(P)-binding domain
Homologous superfamily homologous superfamily	80 — Ubiquitin-activating enzyme E1, inactive adenylation domain, subdomain 1

Domain ID domain_id	6dc6A02
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	50 — Rossmann fold
Homologous superfamily homologous superfamily	12550 — Ubiquitin-activating enzyme E1, inactive adenylation domain, subdomain 2

Domain ID domain_id	6dc6A03
Class class	2 — Mainly Beta
Architecture architecture	40 — Beta Barrel
Topology topology	30 — Elongation Factor Tu (Ef-tu); domain 3
Homologous superfamily homologous superfamily	180 — Ubiquitin-activating enzyme E1, FCCH domain

Domain ID domain_id	6dc6A04
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	50 — Rossmann fold
Homologous superfamily homologous superfamily	720 — NAD(P)-binding Rossmann-like Domain

Domain ID domain_id	6dc6A05
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	10 — Arc Repressor Mutant, subunit A
Homologous superfamily homologous superfamily	2660 — Ubiquitin-activating enzyme E1, SCCH domain

Domain ID domain_id	6dc6A06
Class class	3 — Alpha Beta
Architecture architecture	10 — Roll
Topology topology	290 — Structural Genomics Hypothetical 15.5 Kd Protein In mrcA-pckA Intergenic Region; Chain A
Homologous superfamily homologous superfamily	60 — Ubiquitin-activating enzyme E1, UFD domain

Domain ID domain_id	6dc6C01
Class class	3 — Alpha Beta
Architecture architecture	50 — 3-Layer(bba) Sandwich
Topology topology	50 — FAD/NAD(P)-binding domain
Homologous superfamily homologous superfamily	80 — Ubiquitin-activating enzyme E1, inactive adenylation domain, subdomain 1

Domain ID domain_id	6dc6C02
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	50 — Rossmann fold
Homologous superfamily homologous superfamily	12550 — Ubiquitin-activating enzyme E1, inactive adenylation domain, subdomain 2

Domain ID domain_id	6dc6C03
Class class	2 — Mainly Beta
Architecture architecture	40 — Beta Barrel
Topology topology	30 — Elongation Factor Tu (Ef-tu); domain 3
Homologous superfamily homologous superfamily	180 — Ubiquitin-activating enzyme E1, FCCH domain

Domain ID domain_id	6dc6C04
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	50 — Rossmann fold
Homologous superfamily homologous superfamily	720 — NAD(P)-binding Rossmann-like Domain

Domain ID domain_id	6dc6C05
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	10 — Arc Repressor Mutant, subunit A
Homologous superfamily homologous superfamily	2660 — Ubiquitin-activating enzyme E1, SCCH domain

Domain ID domain_id	6dc6C06
Class class	3 — Alpha Beta
Architecture architecture	10 — Roll
Topology topology	290 — Structural Genomics Hypothetical 15.5 Kd Protein In mrcA-pckA Intergenic Region; Chain A
Homologous superfamily homologous superfamily	60 — Ubiquitin-activating enzyme E1, UFD domain

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Unit-cell length a length_a	104.999 Å
Unit-cell length b length_b	70.438 Å
Unit-cell length c length_c	188.851 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	95.19 °
Unit-cell angle γ angle_gamma	90.00 °
Molecules per unit cell Z z_pdb	4

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

Resolution resolution	3.140 Å
Low-resolution limit resolution_low	41.702 Å
R factor r_factor	0.2142
R_work r_work	0.2125
R_free r_free	0.2500

Crystal structure of human ubiquitin activating enzyme E1 (Uba1) in complex with ubiquitin

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

Ubiquitin-like modifier-activating enzyme 1

State in the Current Structure

Other States of the Same Protein in the Database

Ubiquitin

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

6dc6__assembly_1__model_1

6dc6__assembly_1__model_1 | I(q)

6dc6__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 polymer

Polymer Polymer

Source Source

Entity 3 Entity 3 non-polymer

Entity 4 Entity 4 non-polymer

6. Fold Classification (SCOP + CATH) 14 domains

SCOP 2.08 (2 domains)

CATH v4.4 (12 domains)

7. Citations (1)

Crystal structure of human ubiquitin activating enzyme E1 (Uba1) in complex with ubiquitin

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

Ubiquitin-like modifier-activating enzyme 1

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

Ubiquitin

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

6dc6__assembly_1__model_1

6dc6__assembly_1__model_1 | I(q)

6dc6__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 polymer

Polymer Polymer

Source Source

Entity 3 Entity 3 non-polymer

Entity 4 Entity 4 non-polymer

6. Fold Classification (SCOP + CATH) 14 domains

SCOP 2.08 (2 domains)

CATH v4.4 (12 domains)

7. Citations (1)