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1ir1

Crystal Structure of Spinach Ribulose-1,5-Bisphosphate Carboxylase/Oxygenase (Rubisco) Complexed with CO2, Mg2+ and 2-Carboxyarabinitol-1,5-Bisphosphate

Method: X-RAY DIFFRACTION
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1. Protein Identity and Related Structures Protein Identity & Related Structures

Large subunit of Rubisco

OrganismNot specified

UniProt P00875

State in the Current Structure

Assembly Physical composition Protein state Molecular copy count Associated components Data consistency
1 Protein heterocomplex Heteromer Protein 16 Small subunit of Rubisco × 8 （Q43832） MAGNESIUM ION × 8 2-CARBOXYARABINITOL-1,5-DIPHOSPHATE × 8 water × 16 Consistent with protein count

Other States of the Same Protein in the Database

Monomer

None

Homodimer

None

Homotetramer

None

Other homooligomers

None

Heteromeric or nucleic-acid complex
1aa1 1aus 1ir1 1rbo 1rco 1rcx 1rxo 1upm 1upp 8qj0 8ruc 9cq5

12 assemblies

View Construct and Data Evidence
UniProt name RBL_SPIOL
Isoform —
PDB entities 1
Chains and sequence ranges Author chain A； PDBConstruct 1–475； UniProt 1–475 Author chain B； PDBConstruct 1–475； UniProt 1–475 Author chain C； PDBConstruct 1–475； UniProt 1–475 Author chain D； PDBConstruct 1–475； UniProt 1–475

Small subunit of Rubisco

OrganismNot specified

UniProt Q43832

State in the Current Structure

Assembly Physical composition Protein state Molecular copy count Associated components Data consistency
1 Protein heterocomplex Heteromer Protein 16 Large subunit of Rubisco × 8 （P00875） MAGNESIUM ION × 8 2-CARBOXYARABINITOL-1,5-DIPHOSPHATE × 8 water × 16 Consistent with protein count

Other States of the Same Protein in the Database

Monomer

None

Homodimer

None

Homotetramer

None

Other homooligomers

None

Heteromeric or nucleic-acid complex
1aa1 1aus 1ir1 1upm 1upp 1uzd 8qj0 9cq5

8 assemblies

View Construct and Data Evidence
UniProt name RBS2_SPIOL
Isoform —
PDB entities 2
Chains and sequence ranges Author chain S； PDBConstruct 1–123； UniProt 58–180 Author chain T； PDBConstruct 1–123； UniProt 58–180 Author chain U； PDBConstruct 1–123； UniProt 58–180 Author chain V； PDBConstruct 1–123； UniProt 58–180

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_id1ir1
Deposition date deposition_date2001-08-31
Structure title titleCrystal Structure of Spinach Ribulose-1,5-Bisphosphate Carboxylase/Oxygenase (Rubisco) Complexed with CO2, Mg2+ and 2-Carboxyarabinitol-1,5-Bisphosphate
Keywords keywordsALPHA/BETA BARREL, LYASE; LYASE
Experimental Method methodX-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.

1ir1__assembly_1__model_1

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

Download this curve (.dat)

1ir1__assembly_1__model_1 | I(q)

10-2 10-1 106 107 108 109 q (1/Angstrom) I(q)
100 plotted points; both axes use logarithmic scales.

1ir1__assembly_1__model_1 | P(r) · Pending

The new assembly/model P(r) has not been calculated yet This placeholder does not display legacy data r (Angstrom) P(r)
P(r) will be calculated and displayed separately for the same assembly/model.
Rg（Guinier）47.21 Å
Rg (electron density)46.51 Å
Total Rg46.89 Å
Atom count37568
Residues4680
Excluded volume665020 ų
Maximum q0.500 Å⁻¹
Assembly Model Structure unit Oligomeric description Status CRYSOL Actions
1 1 1ir1__assembly_1__model_1 hexadecameric （16） 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)

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6. Fold Classification (SCOP + CATH) 24 domains

SCOP 2.08 (12 domains)

Domain ID domain_idd1ir1a1
Class classc — Alpha and beta proteins (a/b)
Fold Fold foldc.1 — TIM beta/alpha-barrel
Superfamily Superfamily superfamilyc.1.14 — RuBisCo, C-terminal domain
Family Family familyc.1.14.1 — RuBisCo, large subunit, C-terminal domain
Domain ID domain_idd1ir1a2
Class classd — Alpha and beta proteins (a+b)
Fold Fold foldd.58 — Ferredoxin-like
Superfamily Superfamily superfamilyd.58.9 — RuBisCO, large subunit, small (N-terminal) domain
Family Family familyd.58.9.1 — Ribulose 1,5-bisphosphate carboxylase-oxygenase
Domain ID domain_idd1ir1b1
Class classc — Alpha and beta proteins (a/b)
Fold Fold foldc.1 — TIM beta/alpha-barrel
Superfamily Superfamily superfamilyc.1.14 — RuBisCo, C-terminal domain
Family Family familyc.1.14.1 — RuBisCo, large subunit, C-terminal domain
Domain ID domain_idd1ir1b2
Class classd — Alpha and beta proteins (a+b)
Fold Fold foldd.58 — Ferredoxin-like
Superfamily Superfamily superfamilyd.58.9 — RuBisCO, large subunit, small (N-terminal) domain
Family Family familyd.58.9.1 — Ribulose 1,5-bisphosphate carboxylase-oxygenase
Domain ID domain_idd1ir1c1
Class classc — Alpha and beta proteins (a/b)
Fold Fold foldc.1 — TIM beta/alpha-barrel
Superfamily Superfamily superfamilyc.1.14 — RuBisCo, C-terminal domain
Family Family familyc.1.14.1 — RuBisCo, large subunit, C-terminal domain
Domain ID domain_idd1ir1c2
Class classd — Alpha and beta proteins (a+b)
Fold Fold foldd.58 — Ferredoxin-like
Superfamily Superfamily superfamilyd.58.9 — RuBisCO, large subunit, small (N-terminal) domain
Family Family familyd.58.9.1 — Ribulose 1,5-bisphosphate carboxylase-oxygenase
Domain ID domain_idd1ir1d1
Class classc — Alpha and beta proteins (a/b)
Fold Fold foldc.1 — TIM beta/alpha-barrel
Superfamily Superfamily superfamilyc.1.14 — RuBisCo, C-terminal domain
Family Family familyc.1.14.1 — RuBisCo, large subunit, C-terminal domain
Domain ID domain_idd1ir1d2
Class classd — Alpha and beta proteins (a+b)
Fold Fold foldd.58 — Ferredoxin-like
Superfamily Superfamily superfamilyd.58.9 — RuBisCO, large subunit, small (N-terminal) domain
Family Family familyd.58.9.1 — Ribulose 1,5-bisphosphate carboxylase-oxygenase
Domain ID domain_idd1ir1s_
Class classd — Alpha and beta proteins (a+b)
Fold Fold foldd.73 — RuBisCO, small subunit
Superfamily Superfamily superfamilyd.73.1 — RuBisCO, small subunit
Family Family familyd.73.1.1 — RuBisCO, small subunit
Domain ID domain_idd1ir1t_
Class classd — Alpha and beta proteins (a+b)
Fold Fold foldd.73 — RuBisCO, small subunit
Superfamily Superfamily superfamilyd.73.1 — RuBisCO, small subunit
Family Family familyd.73.1.1 — RuBisCO, small subunit
Domain ID domain_idd1ir1u_
Class classd — Alpha and beta proteins (a+b)
Fold Fold foldd.73 — RuBisCO, small subunit
Superfamily Superfamily superfamilyd.73.1 — RuBisCO, small subunit
Family Family familyd.73.1.1 — RuBisCO, small subunit
Domain ID domain_idd1ir1v_
Class classd — Alpha and beta proteins (a+b)
Fold Fold foldd.73 — RuBisCO, small subunit
Superfamily Superfamily superfamilyd.73.1 — RuBisCO, small subunit
Family Family familyd.73.1.1 — RuBisCO, small subunit

CATH v4.4 (12 domains)

Domain ID domain_id1ir1A01
Class class3 — Alpha Beta
Architecture architecture30 — 2-Layer Sandwich
Topology topology70 — Alpha-Beta Plaits
Homologous superfamily homologous superfamily150 — RuBisCO large subunit, N-terminal domain
Domain ID domain_id1ir1A02
Class class3 — Alpha Beta
Architecture architecture20 — Alpha-Beta Barrel
Topology topology20 — TIM Barrel
Homologous superfamily homologous superfamily110 — Ribulose bisphosphate carboxylase, large subunit, C-terminal domain
Domain ID domain_id1ir1B01
Class class3 — Alpha Beta
Architecture architecture30 — 2-Layer Sandwich
Topology topology70 — Alpha-Beta Plaits
Homologous superfamily homologous superfamily150 — RuBisCO large subunit, N-terminal domain
Domain ID domain_id1ir1B02
Class class3 — Alpha Beta
Architecture architecture20 — Alpha-Beta Barrel
Topology topology20 — TIM Barrel
Homologous superfamily homologous superfamily110 — Ribulose bisphosphate carboxylase, large subunit, C-terminal domain
Domain ID domain_id1ir1C01
Class class3 — Alpha Beta
Architecture architecture30 — 2-Layer Sandwich
Topology topology70 — Alpha-Beta Plaits
Homologous superfamily homologous superfamily150 — RuBisCO large subunit, N-terminal domain
Domain ID domain_id1ir1C02
Class class3 — Alpha Beta
Architecture architecture20 — Alpha-Beta Barrel
Topology topology20 — TIM Barrel
Homologous superfamily homologous superfamily110 — Ribulose bisphosphate carboxylase, large subunit, C-terminal domain
Domain ID domain_id1ir1D01
Class class3 — Alpha Beta
Architecture architecture30 — 2-Layer Sandwich
Topology topology70 — Alpha-Beta Plaits
Homologous superfamily homologous superfamily150 — RuBisCO large subunit, N-terminal domain
Domain ID domain_id1ir1D02
Class class3 — Alpha Beta
Architecture architecture20 — Alpha-Beta Barrel
Topology topology20 — TIM Barrel
Homologous superfamily homologous superfamily110 — Ribulose bisphosphate carboxylase, large subunit, C-terminal domain
Domain ID domain_id1ir1S00
Class class3 — Alpha Beta
Architecture architecture30 — 2-Layer Sandwich
Topology topology190 — Ribulose 1,5 Bisphosphate Carboxylase/Oxygenase
Homologous superfamily homologous superfamily10 — Ribulose bisphosphate carboxylase, small subunit
Domain ID domain_id1ir1T00
Class class3 — Alpha Beta
Architecture architecture30 — 2-Layer Sandwich
Topology topology190 — Ribulose 1,5 Bisphosphate Carboxylase/Oxygenase
Homologous superfamily homologous superfamily10 — Ribulose bisphosphate carboxylase, small subunit
Domain ID domain_id1ir1U00
Class class3 — Alpha Beta
Architecture architecture30 — 2-Layer Sandwich
Topology topology190 — Ribulose 1,5 Bisphosphate Carboxylase/Oxygenase
Homologous superfamily homologous superfamily10 — Ribulose bisphosphate carboxylase, small subunit
Domain ID domain_id1ir1V00
Class class3 — Alpha Beta
Architecture architecture30 — 2-Layer Sandwich
Topology topology190 — Ribulose 1,5 Bisphosphate Carboxylase/Oxygenase
Homologous superfamily homologous superfamily10 — Ribulose bisphosphate carboxylase, small subunit
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7. Citations (1)