2fe8

SARS coronavirus papain-like protease: structure of a viral deubiquitinating enzyme

Method: X-RAY DIFFRACTION

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

Replicase polyprotein 1ab

SARS coronavirus

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein monomer	Monomer	Protein 1	ZINC ION × 1 BROMIDE ION × 3 SULFATE ION × 1 water × 1	Consistent with protein count
2	Protein monomer	Monomer	Protein 1	ZINC ION × 1 BROMIDE ION × 3 SULFATE ION × 1 water × 1	Consistent with protein count
3	Protein monomer	Monomer	Protein 1	ZINC ION × 1 BROMIDE ION × 3 SULFATE ION × 1 water × 1	Consistent with protein count
4	Protein homooligomer	Homooligomer	Protein 6	ZINC ION × 6 BROMIDE ION × 18 SULFATE ION × 6 water × 6	Consistent with protein count
5	Protein homooligomer	Homooligomer	Protein 3	ZINC ION × 3 BROMIDE ION × 9 SULFATE ION × 3 water × 3	Consistent with protein count
6	Protein homooligomer	Homooligomer	Protein 4	ZINC ION × 4 BROMIDE ION × 12 SULFATE ION × 4 water × 4	Consistent with protein count
7	Protein homooligomer	Homooligomer	Protein 2	ZINC ION × 2 BROMIDE ION × 6 SULFATE ION × 2 water × 2	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	R1AB_CVHSA
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 2–315； UniProt 1541–1854 Author chain B； PDBConstruct 2–315； UniProt 1541–1854 Author chain C； PDBConstruct 2–315； UniProt 1541–1854

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	2fe8
Deposition date deposition_date	2005-12-15
Structure title title	SARS coronavirus papain-like protease: structure of a viral deubiquitinating enzyme
Keywords keywords	PROTEASE, HYDROLASE; HYDROLASE
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.

2fe8__assembly_5__model_1

Assembly 5 · Model 1 · CRYSOL 4.1.3-1-20251215 (887e7ef)

Download this curve (.dat)

2fe8__assembly_5__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

2fe8__assembly_5__model_1 | P(r) · Pending

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

Rg（Guinier）	30.31 Å
Rg (electron density)	29.43 Å
Total Rg	30.38 Å
Atom count	7448
Residues	942
Excluded volume	132550 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`2fe8__assembly_1__model_1`	monomeric （1）	Success	4.1.3-1-20251215 (887e7ef)	View Download
2	1	`2fe8__assembly_2__model_1`	monomeric （1）	Success	4.1.3-1-20251215 (887e7ef)	View Download
3	1	`2fe8__assembly_3__model_1`	monomeric （1）	Success	4.1.3-1-20251215 (887e7ef)	View Download
4	1	`2fe8__assembly_4__model_1`	hexameric （6）	Success	4.1.3-1-20251215 (887e7ef)	View Download
5	1	`2fe8__assembly_5__model_1`	trimeric （3）	Success	4.1.3-1-20251215 (887e7ef)	View Download
6	1	`2fe8__assembly_6__model_1`	tetrameric （4）	Success	4.1.3-1-20251215 (887e7ef)	View Download
7	1	`2fe8__assembly_7__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 (5)

Entity 1 Entity 1 polymer

Description description	Replicase polyprotein 1ab
Molecular weight formula_weight	35391.1 kDa
EC 编号 ec_number	3.4.22.-
Source method src_method	man
Copy count entity_count	3

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B,C
Atom count atom_count	7978

MEVKTIKVFTTVDNTNLHTQLVDMSMTYGQQFGPTYLDGADVTKIKPHVNHEGKTFFVLPSDDTLRSEAFEYYHTLDESFLGRYMSALNHTKKWKFPQVGGLTSIKWADNNCYLSSVLLALQQLEVKFNAPALQEAYYRARAGDAANFCALILAYSNKTVGELGDVRETMTHLLQHANLESAKRVLNVVCKHCGQKTTTLTGVEAVMYMGTLSYDNLKTGVSIPCVCGRDATQYLVQQESSFVMMSAPPAEYKLQQGTFLCANEYTGNYQCGHYTHITAKETLYRIDGAHLTKMSEYKGPVTDVFYKETSYTTTI

Source Source

Source organism organism	SARS coronavirus
NCBI taxonomy ID ncbi_taxonomy_id	227859
Host organism host_organism	Escherichia coli BL21

Entity 2 Entity 2 non-polymer

Description description	ZINC ION
Molecular weight formula_weight	65.4 kDa
Source method src_method	syn
Copy count entity_count	3

Entity 3 Entity 3 non-polymer

Description description	BROMIDE ION
Molecular weight formula_weight	79.9 kDa
Source method src_method	syn
Copy count entity_count	9

Entity 4 Entity 4 non-polymer

Description description	SULFATE ION
Molecular weight formula_weight	96.1 kDa
Source method src_method	syn
Copy count entity_count	3

Entity 5 Entity 5 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	530

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6. Fold Classification (SCOP + CATH) 15 domains

SCOP 2.08 (6 domains)

Domain ID domain_id	d2fe8a1
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.15.1.9 — Viral protease ubiquitin-like domain

Domain ID domain_id	d2fe8a2
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.3 — Cysteine proteinases
Superfamily Superfamily superfamily	d.3.1 — Cysteine proteinases
Family Family family	d.3.1.23 — Papain-like viral protease catalytic domain

Domain ID domain_id	d2fe8b1
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.15.1.9 — Viral protease ubiquitin-like domain

Domain ID domain_id	d2fe8b2
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.3 — Cysteine proteinases
Superfamily Superfamily superfamily	d.3.1 — Cysteine proteinases
Family Family family	d.3.1.23 — Papain-like viral protease catalytic domain

Domain ID domain_id	d2fe8c1
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.15.1.9 — Viral protease ubiquitin-like domain

Domain ID domain_id	d2fe8c2
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.3 — Cysteine proteinases
Superfamily Superfamily superfamily	d.3.1 — Cysteine proteinases
Family Family family	d.3.1.23 — Papain-like viral protease catalytic domain

CATH v4.4 (9 domains)

Domain ID domain_id	2fe8A01
Class class	3 — Alpha Beta
Architecture architecture	10 — Roll
Topology topology	20 — Ubiquitin-like (UB roll)
Homologous superfamily homologous superfamily	540 — Papain-like viral protease, N-terminal domain

Domain ID domain_id	2fe8A02
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	8 — Helicase, Ruva Protein; domain 3
Homologous superfamily homologous superfamily	1190 — Papain-like viral protease, thumb domain

Domain ID domain_id	2fe8A03
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	120 — Jelly Rolls
Homologous superfamily homologous superfamily	1680 —

Domain ID domain_id	2fe8B01
Class class	3 — Alpha Beta
Architecture architecture	10 — Roll
Topology topology	20 — Ubiquitin-like (UB roll)
Homologous superfamily homologous superfamily	540 — Papain-like viral protease, N-terminal domain

Domain ID domain_id	2fe8B02
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	8 — Helicase, Ruva Protein; domain 3
Homologous superfamily homologous superfamily	1190 — Papain-like viral protease, thumb domain

Domain ID domain_id	2fe8B03
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	120 — Jelly Rolls
Homologous superfamily homologous superfamily	1680 —

Domain ID domain_id	2fe8C01
Class class	3 — Alpha Beta
Architecture architecture	10 — Roll
Topology topology	20 — Ubiquitin-like (UB roll)
Homologous superfamily homologous superfamily	540 — Papain-like viral protease, N-terminal domain

Domain ID domain_id	2fe8C02
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	8 — Helicase, Ruva Protein; domain 3
Homologous superfamily homologous superfamily	1190 — Papain-like viral protease, thumb domain

Domain ID domain_id	2fe8C03
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	120 — Jelly Rolls
Homologous superfamily homologous superfamily	1680 —

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Unit-cell length a length_a	142.872 Å
Unit-cell length b length_b	103.065 Å
Unit-cell length c length_c	91.728 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	111.15 °
Unit-cell angle γ angle_gamma	90.00 °
Molecules per unit cell Z z_pdb	12

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

Resolution resolution	1.850 Å
Low-resolution limit resolution_low	20.000 Å
R factor r_factor	0.2010
R_work r_work	0.2010
R_free r_free	0.2290

SARS coronavirus papain-like protease: structure of a viral deubiquitinating enzyme

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

Replicase polyprotein 1ab

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

2fe8__assembly_5__model_1

2fe8__assembly_5__model_1 | I(q)

2fe8__assembly_5__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 (5)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 non-polymer

Entity 3 Entity 3 non-polymer

Entity 4 Entity 4 non-polymer

Entity 5 Entity 5 water

6. Fold Classification (SCOP + CATH) 15 domains

SCOP 2.08 (6 domains)

CATH v4.4 (9 domains)

7. Citations (1)

SARS coronavirus papain-like protease: structure of a viral deubiquitinating enzyme

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

Replicase polyprotein 1ab

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

2fe8__assembly_5__model_1

2fe8__assembly_5__model_1 | I(q)

2fe8__assembly_5__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 (5)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 non-polymer

Entity 3 Entity 3 non-polymer

Entity 4 Entity 4 non-polymer

Entity 5 Entity 5 water

6. Fold Classification (SCOP + CATH) 15 domains

SCOP 2.08 (6 domains)

CATH v4.4 (9 domains)

7. Citations (1)