SAXSdb — 8aj0

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

3C-like proteinase nsp5

Severe acute respiratory syndrome coronavirus

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein homooligomer	Homooligomer	Protein 2	;(2R,3S)-3-[[(2S)-3-cyclopropyl-2-[2-oxidanylidene-3-(3-phenylpropanoylamino)pyridin-1-yl]propanoyl]amino]-N-methyl-2-oxidanyl-4-[(3S)-2-oxidanylidenepyrrolidin-3-yl]butanamide ; × 2 CHLORIDE ION × 1 SODIUM ION × 1 water × 2	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	R1AB_SARS2
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain AAA； PDBConstruct 1–302； UniProt 3264–3565 Author chain BBB； PDBConstruct 1–302； UniProt 3264–3565

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	8aj0
Deposition date deposition_date	2022-07-27
Structure title title	Mpro of SARS COV-2 in complex with the RK-90 inhibitor
Keywords keywords	inhibitor complex, SARS-COV-2, VIRAL PROTEIN; VIRAL PROTEIN
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.

8aj0__assembly_1__model_1

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

Download this curve (.dat)

8aj0__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

8aj0__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	26.50 Å
Rg (electron density)	25.49 Å
Total Rg	26.35 Å
Atom count	4744
Residues	603
Excluded volume	84425 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`8aj0__assembly_1__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	3C-like proteinase nsp5
Molecular weight formula_weight	33350.0 kDa
EC 编号 ec_number	3.4.22.69
Source method src_method	man
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	AAA,BBB
Atom count atom_count	4827

SGFRKMAFPSGKVEGCMVQVTCGTTTLNGLWLDDVVYCPRHVICTSEDMLNPNYEDLLIRKSNHNFLVQAGNVQLRVIGHSMQNCVLKLKVDTANPKTPKYKFVRIQPGQTFSVLACYNGSPSGVYQCAMRPNFTIKGSFLNGSCGSVGFNIDYDCVSFCYMHHMELPTGVHAGTDLEGNFYGPFVDRQTAQAAGTDTTITVNVLAWLYAAVINGDRWFLNRFTTTLNDFNLVAMKYNYEPLTQDHVDILGPLSAQTGIAVLDMCASLKELLQNGMNGRTILGSALLEDEFTPFDVVRQCSG

Source Source

Source organism organism	Severe acute respiratory syndrome coronavirus
NCBI taxonomy ID ncbi_taxonomy_id	2901879
Host organism host_organism	Escherichia coli B

Entity 2 Entity 2 non-polymer

Description description	;(2R,3S)-3-[[(2S)-3-cyclopropyl-2-[2-oxidanylidene-3-(3-phenylpropanoylamino)pyridin-1-yl]propanoyl]amino]-N-methyl-2-oxidanyl-4-[(3S)-2-oxidanylidenepyrrolidin-3-yl]butanamide ;
Molecular weight formula_weight	551.6 kDa
Source method src_method	syn
Copy count entity_count	2

Entity 3 Entity 3 non-polymer

Description description	CHLORIDE ION
Molecular weight formula_weight	35.5 kDa
Source method src_method	syn
Copy count entity_count	1

Entity 4 Entity 4 non-polymer

Description description	SODIUM ION
Molecular weight formula_weight	23.0 kDa
Source method src_method	syn
Copy count entity_count	1

Entity 5 Entity 5 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	72

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Unit-cell length a length_a	45.253 Å
Unit-cell length b length_b	54.376 Å
Unit-cell length c length_c	114.192 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	101.38 °
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	2.519 Å
Low-resolution limit resolution_low	48.959 Å
R factor r_factor	—
R_work r_work	0.1856
R_free r_free	0.2661

Mpro of SARS COV-2 in complex with the RK-90 inhibitor

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

3C-like proteinase nsp5

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

8aj0__assembly_1__model_1

8aj0__assembly_1__model_1 | I(q)

8aj0__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 (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

7. Citations (1)

Mpro of SARS COV-2 in complex with the RK-90 inhibitor

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

3C-like proteinase nsp5

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

8aj0__assembly_1__model_1

8aj0__assembly_1__model_1 | I(q)

8aj0__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 (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

7. Citations (1)