SAXSdb — 1fn9

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

OUTER-CAPSID PROTEIN SIGMA 3

Reovirus sp.

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein homooligomer	Homooligomer	Protein 2	ZINC ION × 2 water × 2	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	Q98639_9REOV
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–365； UniProt 1–365 Author chain B； PDBConstruct 1–365； UniProt 1–365

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	1fn9
Deposition date deposition_date	2000-08-21
Structure title title	CRYSTAL STRUCTURE OF THE REOVIRUS OUTER CAPSID PROTEIN SIGMA 3
Keywords keywords	Zinc binding motif, 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.

1fn9__assembly_1__model_1

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

Download this curve (.dat)

1fn9__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

1fn9__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	29.98 Å
Rg (electron density)	29.02 Å
Total Rg	29.60 Å
Atom count	5766
Residues	730
Excluded volume	102310 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`1fn9__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 (3)

Entity 1 Entity 1 polymer

Description description	OUTER-CAPSID PROTEIN SIGMA 3
Molecular weight formula_weight	41168.1 kDa
Source method src_method	man
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B
Atom count atom_count	6522

MEVCLPNGHQVVDLINNAFEGRVSIYSAQEGWDKTISAQPDMMVCGGAVVCMHCLGVVGSLQRKLKHLPHHRCNQQIRHQDYVDVQFADRVTAHWKRGMLSFVAQMHEMMNDVSPDDLDRVRTEGGSLVELNWLQVDPNSMFRSIHSSWTDPLQVVDDLDTKLDQYWTALNLMIDSSDLIPNFMMRDPSHAFNGVKLGGDARQTQFSRTFDSRSSLEWGVMVYDYSELEHDPSKGRAYRKELVTPARDFGHFGLSHYSRATTPILGKMPAVFSGMLTGNCKMYPFIKGTAKLKTVRKLVEAVNHAWGVEKIRYALGPGGMTGWYNRTMQQAPIVLTPAALTMFPDTIKFGDLNYPVMIGDPMILG

Source Source

Source organism organism	Reovirus sp.
NCBI taxonomy ID ncbi_taxonomy_id	10891
Host organism host_organism	Spodoptera frugiperda

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	2

Entity 3 Entity 3 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	756

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6. Fold Classification (SCOP + CATH) 6 domains

SCOP 2.08 (2 domains)

Domain ID domain_id	d1fn9a_
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.196 — Outer capsid protein sigma 3
Superfamily Superfamily superfamily	d.196.1 — Outer capsid protein sigma 3
Family Family family	d.196.1.1 — Outer capsid protein sigma 3

Domain ID domain_id	d1fn9b_
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.196 — Outer capsid protein sigma 3
Superfamily Superfamily superfamily	d.196.1 — Outer capsid protein sigma 3
Family Family family	d.196.1.1 — Outer capsid protein sigma 3

CATH v4.4 (4 domains)

Domain ID domain_id	1fn9A01
Class class	3 — Alpha Beta
Architecture architecture	90 — Alpha-Beta Complex
Topology topology	1630 — Outer-capsid protein sigma 3, small lobe
Homologous superfamily homologous superfamily	10 — Outer-capsid protein sigma 3, small lobe

Domain ID domain_id	1fn9A02
Class class	3 — Alpha Beta
Architecture architecture	90 — Alpha-Beta Complex
Topology topology	1320 — Outer-capsid protein sigma 3, large lobe
Homologous superfamily homologous superfamily	10 — Outer-capsid protein sigma 3, large lobe

Domain ID domain_id	1fn9B01
Class class	3 — Alpha Beta
Architecture architecture	90 — Alpha-Beta Complex
Topology topology	1630 — Outer-capsid protein sigma 3, small lobe
Homologous superfamily homologous superfamily	10 — Outer-capsid protein sigma 3, small lobe

Domain ID domain_id	1fn9B02
Class class	3 — Alpha Beta
Architecture architecture	90 — Alpha-Beta Complex
Topology topology	1320 — Outer-capsid protein sigma 3, large lobe
Homologous superfamily homologous superfamily	10 — Outer-capsid protein sigma 3, large lobe

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Unit-cell length a length_a	77.898 Å
Unit-cell length b length_b	82.564 Å
Unit-cell length c length_c	132.264 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 21 21 21
Space-group number int_tables_number	19
Crystal system crystal_system	—

Resolution resolution	1.800 Å
Low-resolution limit resolution_low	500.000 Å
R factor r_factor	—
R_work r_work	0.1690
R_free r_free	0.1950

CRYSTAL STRUCTURE OF THE REOVIRUS OUTER CAPSID PROTEIN SIGMA 3

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

OUTER-CAPSID PROTEIN SIGMA 3

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

1fn9__assembly_1__model_1

1fn9__assembly_1__model_1 | I(q)

1fn9__assembly_1__model_1 | P(r) · Pending

4. Crystallography and Experiment 4. Crystallography & Experiment

Unit cell Unit Cell

Symmetry Symmetry

Refinement Refinement

5. Entities and Polymers Entities & Polymers (3)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 non-polymer

Entity 3 Entity 3 water

6. Fold Classification (SCOP + CATH) 6 domains

SCOP 2.08 (2 domains)

CATH v4.4 (4 domains)

7. Citations (1)

CRYSTAL STRUCTURE OF THE REOVIRUS OUTER CAPSID PROTEIN SIGMA 3

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

OUTER-CAPSID PROTEIN SIGMA 3

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

1fn9__assembly_1__model_1

1fn9__assembly_1__model_1 | I(q)

1fn9__assembly_1__model_1 | P(r) · Pending

4. Crystallography and Experiment 4. Crystallography & Experiment

Unit cell Unit Cell

Symmetry Symmetry

Refinement Refinement

5. Entities and Polymers Entities & Polymers (3)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 non-polymer

Entity 3 Entity 3 water

6. Fold Classification (SCOP + CATH) 6 domains

SCOP 2.08 (2 domains)

CATH v4.4 (4 domains)

7. Citations (1)