9v9q

Cryo-EM structure of the cPRC1-UbcH5c E3-E2 complex bound to the H2BK120ub-modified nucleosome

Method: ELECTRON MICROSCOPY

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

Histone H3

Xenopus laevis

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein–DNA	Heteromer	Protein 13 DNA 2	Histone H4 × 2 （P62799） Histone H2A × 2 （Q6AZJ8） Histone H2B × 2 （A0A8J0TWI5） DNA (144-MER) × 1 DNA (145-MER) × 1 Polycomb complex protein BMI-1 × 1 （P35226） E3 ubiquitin-protein ligase RING2 × 1 （Q99496） Ubiquitin-conjugating enzyme E2 D3 × 1 （P61077） Ubiquitin × 1 （P0CG47） Ubiquitin × 1 （P62979） ZINC ION × 4	Consistent with all polymers

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	A0A310TTQ1_XENLA
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–136； UniProt 1–136 Author chain E； PDBConstruct 1–136； UniProt 1–136

Histone H4

Xenopus laevis

UniProt P62799

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein–DNA	Heteromer	Protein 13 DNA 2	Histone H3 × 2 （A0A310TTQ1） Histone H2A × 2 （Q6AZJ8） Histone H2B × 2 （A0A8J0TWI5） DNA (144-MER) × 1 DNA (145-MER) × 1 Polycomb complex protein BMI-1 × 1 （P35226） E3 ubiquitin-protein ligase RING2 × 1 （Q99496） Ubiquitin-conjugating enzyme E2 D3 × 1 （P61077） Ubiquitin × 1 （P0CG47） Ubiquitin × 1 （P62979） ZINC ION × 4	Consistent with all polymers

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	H4_XENLA
Isoform	—
PDB entities	2
Chains and sequence ranges	Author chain B； PDBConstruct 1–103； UniProt 1–103 Author chain F； PDBConstruct 1–103； UniProt 1–103

Histone H2A

Xenopus laevis

UniProt Q6AZJ8

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein–DNA	Heteromer	Protein 13 DNA 2	Histone H3 × 2 （A0A310TTQ1） Histone H4 × 2 （P62799） Histone H2B × 2 （A0A8J0TWI5） DNA (144-MER) × 1 DNA (145-MER) × 1 Polycomb complex protein BMI-1 × 1 （P35226） E3 ubiquitin-protein ligase RING2 × 1 （Q99496） Ubiquitin-conjugating enzyme E2 D3 × 1 （P61077） Ubiquitin × 1 （P0CG47） Ubiquitin × 1 （P62979） ZINC ION × 4	Consistent with all polymers

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	Q6AZJ8_XENLA
Isoform	—
PDB entities	3
Chains and sequence ranges	Author chain C； PDBConstruct 1–130； UniProt 1–130 Author chain G； PDBConstruct 1–130； UniProt 1–130

Histone H2B

Xenopus laevis

UniProt A0A8J0TWI5

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein–DNA	Heteromer	Protein 13 DNA 2	Histone H3 × 2 （A0A310TTQ1） Histone H4 × 2 （P62799） Histone H2A × 2 （Q6AZJ8） DNA (144-MER) × 1 DNA (145-MER) × 1 Polycomb complex protein BMI-1 × 1 （P35226） E3 ubiquitin-protein ligase RING2 × 1 （Q99496） Ubiquitin-conjugating enzyme E2 D3 × 1 （P61077） Ubiquitin × 1 （P0CG47） Ubiquitin × 1 （P62979） ZINC ION × 4	Consistent with all polymers

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	A0A8J0TWI5_XENLA
Isoform	—
PDB entities	4
Chains and sequence ranges	Author chain D； PDBConstruct 1–126； UniProt 1–126 Author chain H； PDBConstruct 1–126； UniProt 1–126

Polycomb complex protein BMI-1

Homo sapiens

UniProt P35226

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein–DNA	Heteromer	Protein 13 DNA 2	Histone H3 × 2 （A0A310TTQ1） Histone H4 × 2 （P62799） Histone H2A × 2 （Q6AZJ8） Histone H2B × 2 （A0A8J0TWI5） DNA (144-MER) × 1 DNA (145-MER) × 1 E3 ubiquitin-protein ligase RING2 × 1 （Q99496） Ubiquitin-conjugating enzyme E2 D3 × 1 （P61077） Ubiquitin × 1 （P0CG47） Ubiquitin × 1 （P62979） ZINC ION × 4	Consistent with all polymers

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	BMI1_HUMAN
Isoform	—
PDB entities	7
Chains and sequence ranges	Author chain M； PDBConstruct 1–326； UniProt 1–326

E3 ubiquitin-protein ligase RING2

Homo sapiens

UniProt Q99496

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein–DNA	Heteromer	Protein 13 DNA 2	Histone H3 × 2 （A0A310TTQ1） Histone H4 × 2 （P62799） Histone H2A × 2 （Q6AZJ8） Histone H2B × 2 （A0A8J0TWI5） DNA (144-MER) × 1 DNA (145-MER) × 1 Polycomb complex protein BMI-1 × 1 （P35226） Ubiquitin-conjugating enzyme E2 D3 × 1 （P61077） Ubiquitin × 1 （P0CG47） Ubiquitin × 1 （P62979） ZINC ION × 4	Consistent with all polymers

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	RING2_HUMAN
Isoform	—
PDB entities	8
Chains and sequence ranges	Author chain N； PDBConstruct 1–336； UniProt 1–336

Ubiquitin-conjugating enzyme E2 D3

Homo sapiens

UniProt P61077

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein–DNA	Heteromer	Protein 13 DNA 2	Histone H3 × 2 （A0A310TTQ1） Histone H4 × 2 （P62799） Histone H2A × 2 （Q6AZJ8） Histone H2B × 2 （A0A8J0TWI5） DNA (144-MER) × 1 DNA (145-MER) × 1 Polycomb complex protein BMI-1 × 1 （P35226） E3 ubiquitin-protein ligase RING2 × 1 （Q99496） Ubiquitin × 1 （P0CG47） Ubiquitin × 1 （P62979） ZINC ION × 4	Consistent with all polymers

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	UB2D3_HUMAN
Isoform	—
PDB entities	9
Chains and sequence ranges	Author chain P； PDBConstruct 1–147； UniProt 1–147

Ubiquitin

Homo sapiens

UniProt P0CG47

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein–DNA	Heteromer	Protein 13 DNA 2	Histone H3 × 2 （A0A310TTQ1） Histone H4 × 2 （P62799） Histone H2A × 2 （Q6AZJ8） Histone H2B × 2 （A0A8J0TWI5） DNA (144-MER) × 1 DNA (145-MER) × 1 Polycomb complex protein BMI-1 × 1 （P35226） E3 ubiquitin-protein ligase RING2 × 1 （Q99496） Ubiquitin-conjugating enzyme E2 D3 × 1 （P61077） Ubiquitin × 1 （P62979） ZINC ION × 4	Consistent with all polymers

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	UBB_HUMAN
Isoform	—
PDB entities	10
Chains and sequence ranges	Author chain O； PDBConstruct 1–76； UniProt 153–228

Ubiquitin

Homo sapiens

UniProt P62979

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein–DNA	Heteromer	Protein 13 DNA 2	Histone H3 × 2 （A0A310TTQ1） Histone H4 × 2 （P62799） Histone H2A × 2 （Q6AZJ8） Histone H2B × 2 （A0A8J0TWI5） DNA (144-MER) × 1 DNA (145-MER) × 1 Polycomb complex protein BMI-1 × 1 （P35226） E3 ubiquitin-protein ligase RING2 × 1 （Q99496） Ubiquitin-conjugating enzyme E2 D3 × 1 （P61077） Ubiquitin × 1 （P0CG47） ZINC ION × 4	Consistent with all polymers

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	RS27A_HUMAN
Isoform	—
PDB entities	11
Chains and sequence ranges	Author chain R； PDBConstruct 1–76； 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	9v9q
Deposition date deposition_date	2025-06-02
Structure title title	Cryo-EM structure of the cPRC1-UbcH5c E3-E2 complex bound to the H2BK120ub-modified nucleosome
Keywords keywords	nucleosome modification, transcriptional regulation, GENE REGULATION; GENE REGULATION
Experimental Method method	ELECTRON MICROSCOPY

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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.

9v9q__assembly_1__model_1

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

Download this curve (.dat)

9v9q__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

9v9q__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	43.10 Å
Rg (electron density)	40.99 Å
Total Rg	41.56 Å
Atom count	15996
Residues	1555
Excluded volume	266810 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`9v9q__assembly_1__model_1`	pentadecameric （15）	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 (12)

Entity 1 Entity 1 polymer

Description description	Histone H3
Molecular weight formula_weight	15435.1 kDa
Source method src_method	man
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,E
Atom count atom_count	15996

MARTKQTARKSTGGKAPRKQLATKAARKSAPATGGVKKPHRYRPGTVALREIRRYQKSTELLIRKLPFQRLVREIAQDFKTDLRFQSSAVMALQEASEAYLVALFEDTNLCAIHAKRVTIMPKDIQLARRIRGERA

Source Source

Source organism organism	Xenopus laevis
Common name common_name	African clawed frog
NCBI taxonomy ID ncbi_taxonomy_id	8355
Host organism host_organism	Escherichia coli

Entity 2 Entity 2 polymer

Description description	Histone H4
Molecular weight formula_weight	11394.4 kDa
Source method src_method	man
Copy count entity_count	2

Polymer Polymer

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

MSGRGKGGKGLGKGGAKRHRKVLRDNIQGITKPAIRRLARRGGVKRISGLIYEETRGVLKVFLENVIRDAVTYTEHAKRKTVTAMDVVYALKRQGRTLYGFGG

Source Source

Source organism organism	Xenopus laevis
Common name common_name	African clawed frog
NCBI taxonomy ID ncbi_taxonomy_id	8355
Host organism host_organism	Escherichia coli

Entity 3 Entity 3 polymer

Description description	Histone H2A
Molecular weight formula_weight	14109.4 kDa
Source method src_method	man
Copy count entity_count	2

Polymer Polymer

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

MSGRGKQGGKTRAKAKTRSSRAGLQFPVGRVHRLLRKGNYAERVGAGAPVYLAAVLEYLTAEILELAGNAARDNKKTRIIPRHLQLAVRNDEELNKLLGRVTIAQGGVLPNIQSVLLPKKTESSKSAKSK

Source Source

Source organism organism	Xenopus laevis
Common name common_name	African clawed frog
NCBI taxonomy ID ncbi_taxonomy_id	8355
Host organism host_organism	Escherichia coli

Entity 4 Entity 4 polymer

Description description	Histone H2B
Molecular weight formula_weight	13913.2 kDa
Mutation mutation	K121C
Source method src_method	man
Copy count entity_count	2

Polymer Polymer

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

MPDPAKSAPAAKKGSKKAVTKTQKKDGKKRRKTRKESYAIYVYKVLKQVHPDTGISSKAMSIMNSFVNDVFERIAGEASRLAHYNKRSTITSREIQTAVRLLLPGELAKHAVSEGTKAVTCYTSAK

Source Source

Source organism organism	Xenopus laevis
Common name common_name	African clawed frog
NCBI taxonomy ID ncbi_taxonomy_id	8355
Host organism host_organism	Escherichia coli

Entity 5 Entity 5 polymer

Description description	DNA (144-MER)
Molecular weight formula_weight	44217.2 kDa
Source method src_method	man
Copy count entity_count	1

Polymer Polymer

Polymer type type	polydeoxyribonucleotide
Chain IDs strand_id	I

CGAGAATCCCGGTGCCGAGGCCGCTCAATTGGTCGTAGACAGCTCTAGCACCGCTTAAACGCACGTACGCGCTGTCCCCCGCGTTTTAACCGCCAAGGGGATTACTCCCTAGTCTCCAGGCACGTGTCAGATATATACATCCGA

Source Source

Source organism organism	Homo sapiens
NCBI taxonomy ID ncbi_taxonomy_id	9606
Host organism host_organism	Escherichia coli

Entity 6 Entity 6 polymer

Description description	DNA (145-MER)
Molecular weight formula_weight	44992.6 kDa
Source method src_method	man
Copy count entity_count	1

Polymer Polymer

Polymer type type	polydeoxyribonucleotide
Chain IDs strand_id	J

TCGGATGTATATATCTGACACGTGCCTGGAGACTAGGGAGTAATCCCCTTGGCGGTTAAAACGCGGGGGACAGCGCGTACGTGCGTTTAAGCGGTGCTAGAGCTGTCTACGACCAATTGAGCGGCCTCGGCACCGGGATTCTCGA

Source Source

Source organism organism	Homo sapiens
NCBI taxonomy ID ncbi_taxonomy_id	9606
Host organism host_organism	Escherichia coli

Entity 7 Entity 7 polymer

Description description	Polycomb complex protein BMI-1
Molecular weight formula_weight	37006.1 kDa
Source method src_method	man
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	M

MHRTTRIKITELNPHLMCVLCGGYFIDATTIIECLHSFCKTCIVRYLETSKYCPICDVQVHKTRPLLNIRSDKTLQDIVYKLVPGLFKNEMKRRRDFYAAHPSADAANGSNEDRGEVADEDKRIITDDEIISLSIEFFDQNRLDRKVNKDKEKSKEEVNDKRYLRCPAAMTVMHLRKFLRSKMDIPNTFQIDVMYEEEPLKDYYTLMDIAYIYTWRRNGPLPLKYRVRPTCKRMKISHQRDGLTNAGELESDSGSDKANSPAGGIPSTSSCLPSPSTPVQSPHPQFPHISSTMNGTSNSPSGNHQSSFANRPRKSSVNGSSATSSG

Source Source

Source organism organism	Homo sapiens
Common name common_name	human
NCBI taxonomy ID ncbi_taxonomy_id	9606
Host organism host_organism	Homo sapiens

Entity 8 Entity 8 polymer

Description description	E3 ubiquitin-protein ligase RING2
Molecular weight formula_weight	37706.4 kDa
EC 编号 ec_number	2.3.2.27
Source method src_method	man
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	N

MSQAVQTNGTQPLSKTWELSLYELQRTPQEAITDGLEIVVSPRSLHSELMCPICLDMLKNTMTTKECLHRFCADCIITALRSGNKECPTCRKKLVSKRSLRPDPNFDALISKIYPSRDEYEAHQERVLARINKHNNQQALSHSIEEGLKIQAMNRLQRGKKQQIENGSGAEDNGDSSHCSNASTHSNQEAGPSNKRTKTSDDSGLELDNNNAAMAIDPVMDGASEIELVFRPHPTLMEKDDSAQTRYIKTSGNATVDHLSKYLAVRLALEELRSKGESNQMNLDTASEKQYTIYIATASGQFTVLNGSFSLELVSEKYWKVNKPMELYYAPTKEHK

Source Source

Source organism organism	Homo sapiens
Common name common_name	human
NCBI taxonomy ID ncbi_taxonomy_id	9606
Host organism host_organism	Homo sapiens

Entity 9 Entity 9 polymer

Description description	Ubiquitin-conjugating enzyme E2 D3
Molecular weight formula_weight	16760.2 kDa
EC 编号 ec_number	2.3.2.23,2.3.2.24
Mutation mutation	C85S, S22R
Source method src_method	man
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	P

MALKRINKELSDLARDPPAQCRAGPVGDDMFHWQATIMGPNDSPYQGGVFFLTIHFPTDYPFKPPKVAFTTRIYHPNINSNGSISLDILRSQWSPALTISKVLLSICSLLCDPNPDDPLVPEIARIYKTDRDKYNRISREWTQKYAM

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 10 Entity 10 polymer

Description description	Ubiquitin
Molecular weight formula_weight	8622.9 kDa
Mutation mutation	G76C
Source method src_method	man
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	O

MQIFVKTLTGKTITLEVEPSDTIENVKAKIQDKEGIPPDQQRLIFAGKQLEDGRTLSDYNIQKESTLHLVLRLRGC

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 11 Entity 11 polymer

Description description	Ubiquitin
Molecular weight formula_weight	8576.8 kDa
Source method src_method	man
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	R

MQIFVKTLTGKTITLEVEPSDTIENVKAKIQDKEGIPPDQQRLIFAGKQLEDGRTLSDYNIQKESTLHLVLRLRGG

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 12 Entity 12 non-polymer

Description description	ZINC ION
Molecular weight formula_weight	65.4 kDa
Source method src_method	syn
Copy count entity_count	4

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Unit-cell length a length_a	1.000 Å
Unit-cell length b length_b	1.000 Å
Unit-cell length c length_c	1.000 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	—

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

Resolution resolution	2.80 Å
Resolution测定Method resolution_method	—
颗粒数 num_particles	75479

Cryo-EM structure of the cPRC1-UbcH5c E3-E2 complex bound to the H2BK120ub-modified nucleosome

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

Histone H3

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

Histone H4

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

Histone H2A

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

Histone H2B

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

Polycomb complex protein BMI-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

E3 ubiquitin-protein ligase RING2

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-conjugating enzyme E2 D3

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

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

9v9q__assembly_1__model_1

9v9q__assembly_1__model_1 | I(q)

9v9q__assembly_1__model_1 | P(r) · Pending

4. Crystallography and Experiment 4. Crystallography & Experiment