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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

Replaces:  1BUR
Entity
Entity IDChain IDDescriptionTypeChain lengthFormula weightNumber of moleculesDB Name (Accession)Biological sourceDescriptive keywords
1A, C, E, G
(A, B, C, D)
Large subunit of Rubiscopolymer47552849.74UniProt (P00875)
Pfam (PF02788)
Pfam (PF00016)
Spinacia oleracea (spinach)RIBULOSE BISPHOSPHATE CARBOXYLASE LARGE CHAIN
2B, D, F, H
(S, T, U, V)
Small subunit of Rubiscopolymer12314687.74UniProt (Q43832)
Pfam (PF00101)
Spinacia oleracea (spinach)RIBULOSE BISPHOSPHATE CARBOXYLASE SMALL CHAIN 2
3I, K, M, O
(A, B, C, D)
MAGNESIUM IONnon-polymer24.34Chemie (MG)
PubChem (888)
4J, L, N, P
(A, B, C, D)
2-CARBOXYARABINITOL-1,5-DIPHOSPHATEnon-polymer356.14Chemie (CAP)
PubChem (122210)
PubChem (448306)
PubChem (3514896)
PubChem (152996)
PubChem (100968814)
PubChem (100968815)
PubChem (101762027)
PubChem (129690150)
5Q, R, S, T, U...
(A, S, B, T, C...)
waterwater18.02272Chemie (HOH)
Sequence modifications
A, B, C, D: 1 - 475 (UniProt: P00875)
PDBExternal DatabaseDetails
Kcx 201Lys 201modified residue
S, T, U, V: 1 - 123 (UniProt: Q43832)
PDBExternal DatabaseDetails
Mme 1Met 58modified residue
Sequence viewer
Contents of the asymmetric unit
PolymersNumber of chains8
Total formula weight270149.8
Non-Polymers*Number of molecules8
Total formula weight1521.7
All*Total formula weight271671.5
*Water molecules are not included.

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PDB entries from 2026-04-01

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