1IR2: Large subunit of Rubisco

Crystal Structure of Activated Ribulose-1,5-bisphosphate Carboxylase/oxygenase (Rubisco) from Green alga, Chlamydomonas reinhardtii Complexed with 2-Carboxyarabinitol-1,5-bisphosphate (2-CABP). Determined by X-ray diffraction at 1.84 Å resolution. Released 20 Mar 2002.

Method: X-ray diffraction
Resolution: 1.84 Å
Organism: Chlamydomonas reinhardtii
Chains: 32
Atoms: 87,087
Mol. weight: 1113.89 kDa
Ligands: MG, CAP
Released: 20 Mar 2002

Explore 1IR2 in 3D Show helices and sheets RCSB PDB PDBe

Secondary structure: helices and β-sheets

1IR2 contains 546 α-helices and 512 β-strands across 32 chains. Residue ranges use author residue numbering, as in the PDB file, from PDBe. To see them in 3D, choose the Cartoon representation with Secondary structure coloring: helices, sheets and coils get different colors.

Chains 1, 3, 4, 6 and 7: 8 helices, 8 β-strands

Element	Residues	Length	Sheet
α-helix	2-3	2
β-strand	4	1	116
α-helix	5	1
α-helix	20-22	3
α-helix	23-35	13
β-strand	39-45	7	117
α-helix	47-49	3
β-strand	53	1	118
α-helix	55-59	5
β-strand	69	1	118
β-strand	74-76	3	117
α-helix	86-99	14
β-strand	104-111	8	117
β-strand	116-124	9	117
α-helix	135-137	3
β-strand	139	1	116

Chains 2 and I: 6 helices, 8 β-strands

Element	Residues	Length	Sheet
β-strand	4	1	127
α-helix	20-22	3
α-helix	23-35	13
β-strand	39-45	7	128
α-helix	47-49	3
β-strand	53	1	129
α-helix	55-59	5
β-strand	69	1	129
β-strand	74-75	2	128
α-helix	86-99	14
β-strand	104-111	8	128
β-strand	116-124	9	128
α-helix	135-137	3
β-strand	139	1	127

Chains 5, 8, J and P: 8 helices, 8 β-strands

Element	Residues	Length	Sheet
α-helix	3	1
β-strand	4	1	158
α-helix	5	1
α-helix	20-22	3
α-helix	23-35	13
β-strand	39-45	7	159
α-helix	47-49	3
β-strand	53	1	160
α-helix	55-59	5
β-strand	69	1	160
β-strand	74-76	3	159
α-helix	86-99	14
β-strand	104-111	8	159
β-strand	116-124	9	159
α-helix	135-137	3
β-strand	139	1	158

Chain A: 26 helices, 24 β-strands

Element	Residues	Length	Sheet
α-helix	21-24	4
β-strand	25	1	1
β-strand	36-44	9	1
α-helix	45	1
α-helix	50-59	10
α-helix	70-74	5
α-helix	77-80	4
β-strand	83-89	7	1
β-strand	97-103	7	1
α-helix	105-107	3
α-helix	113-121	9
α-helix	124-126	3
β-strand	127	1	2
β-strand	130-139	10	1
α-helix	142-145	4
α-helix	155-162	8
β-strand	169-171	3	3
β-strand	173	1	4
α-helix	182-194	13
β-strand	199-201	3	4
β-strand	209	1	5
β-strand	212	1	5
α-helix	214-232	19
β-strand	237-239	3	4
β-strand	240-241	2	3
α-helix	247-260	14
β-strand	264-268	5	3
α-helix	269-272	4
α-helix	274-287	14
β-strand	290-294	5	3
α-helix	298-302	5
β-strand	308-309	2	1
α-helix	311-321	11
β-strand	325-327	3	3
β-strand	335	1	6
α-helix	339-350	12
β-strand	353-354	2	7
β-strand	357	1	8
α-helix	358-360	3
β-strand	362	1	8
β-strand	366-367	2	7
α-helix	371-374	4
β-strand	375-379	5	3
α-helix	384-386	3
α-helix	387-394	8
β-strand	399-401	3	3
α-helix	404-407	4
α-helix	413-432	20
α-helix	437-449	13
α-helix	453-462	10

Chain B: 26 helices, 24 β-strands

Element	Residues	Length	Sheet
α-helix	21-24	4
β-strand	25	1	21
β-strand	36-44	9	21
α-helix	45	1
α-helix	50-59	10
α-helix	70-74	5
α-helix	77-80	4
β-strand	83-89	7	21
β-strand	97-103	7	21
α-helix	105-107	3
α-helix	113-120	8
α-helix	124-126	3
β-strand	127	1	22
β-strand	130-139	10	21
α-helix	142-145	4
α-helix	155-162	8
β-strand	169-171	3	23
β-strand	173	1	24
α-helix	182-194	13
β-strand	199-201	3	24
β-strand	209	1	25
β-strand	212	1	25
α-helix	214-232	19
β-strand	237-239	3	24
β-strand	240-241	2	23
α-helix	247-260	14
β-strand	264-268	5	23
α-helix	269-272	4
α-helix	274-287	14
β-strand	290-294	5	23
α-helix	298-302	5
β-strand	308-309	2	21
α-helix	311-321	11
β-strand	325-327	3	23
β-strand	335	1	26
α-helix	339-350	12
β-strand	353-354	2	27
β-strand	357	1	28
α-helix	358-360	3
β-strand	362	1	28
β-strand	366-367	2	27
α-helix	371-374	4
β-strand	375-379	5	23
α-helix	384-386	3
α-helix	387-394	8
β-strand	399-401	3	23
α-helix	404-407	4
α-helix	413-432	20
α-helix	437-449	13
α-helix	453-462	10

Chain C: 27 helices, 24 β-strands

Element	Residues	Length	Sheet
α-helix	21-24	4
β-strand	25	1	41
β-strand	36-44	9	41
α-helix	45	1
α-helix	50-60	11
α-helix	70-74	5
α-helix	77-80	4
β-strand	83-89	7	41
α-helix	90	1
β-strand	97-103	7	41
α-helix	105-107	3
α-helix	113-121	9
α-helix	124-126	3
β-strand	127	1	42
β-strand	130-139	10	41
α-helix	142-145	4
α-helix	155-162	8
β-strand	169-171	3	43
β-strand	173	1	44
α-helix	182-194	13
β-strand	199-201	3	44
β-strand	209	1	45
β-strand	212	1	45
α-helix	214-232	19
β-strand	237-239	3	44
β-strand	240-241	2	43
α-helix	247-260	14
β-strand	264-268	5	43
α-helix	269-272	4
α-helix	274-287	14
β-strand	290-294	5	43
α-helix	298-302	5
β-strand	308-309	2	41
α-helix	311-321	11
β-strand	325-327	3	43
β-strand	335	1	46
α-helix	339-350	12
β-strand	353-354	2	47
β-strand	357	1	48
α-helix	358-360	3
β-strand	362	1	48
β-strand	366-367	2	47
α-helix	371-374	4
β-strand	375-379	5	43
α-helix	384-386	3
α-helix	387-394	8
β-strand	399-401	3	43
α-helix	404-407	4
α-helix	413-432	20
α-helix	437-449	13
α-helix	453-462	10

Chain D: 26 helices, 24 β-strands

Element	Residues	Length	Sheet
α-helix	21-24	4
β-strand	25	1	61
β-strand	36-44	9	61
α-helix	45	1
α-helix	50-60	11
α-helix	70-74	5
α-helix	77-80	4
β-strand	83-89	7	61
β-strand	97-103	7	61
α-helix	105-107	3
α-helix	113-120	8
α-helix	124-126	3
β-strand	127	1	62
β-strand	130-139	10	61
α-helix	142-145	4
α-helix	155-162	8
β-strand	169-171	3	63
β-strand	173	1	64
α-helix	182-194	13
β-strand	199-201	3	64
β-strand	209	1	65
β-strand	212	1	65
α-helix	214-232	19
β-strand	237-239	3	64
β-strand	240-241	2	63
α-helix	247-260	14
β-strand	264-268	5	63
α-helix	269-272	4
α-helix	274-287	14
β-strand	290-294	5	63
α-helix	298-302	5
β-strand	308-309	2	61
α-helix	311-321	11
β-strand	325-327	3	63
β-strand	335	1	66
α-helix	339-350	12
β-strand	353-354	2	67
β-strand	357	1	68
α-helix	358-360	3
β-strand	362	1	68
β-strand	366-367	2	67
α-helix	371-374	4
β-strand	375-379	5	63
α-helix	384-386	3
α-helix	387-394	8
β-strand	399-401	3	63
α-helix	404-407	4
α-helix	413-432	20
α-helix	437-449	13
α-helix	453-462	10

Chains E and Z: 27 helices, 24 β-strands

Element	Residues	Length	Sheet
α-helix	21-24	4
β-strand	25	1	72
β-strand	36-44	9	72
α-helix	45	1
α-helix	50-60	11
α-helix	70-74	5
α-helix	77-80	4
β-strand	83-89	7	72
α-helix	90	1
β-strand	97-103	7	72
α-helix	105-107	3
α-helix	113-120	8
α-helix	124-126	3
β-strand	127	1	6
β-strand	130-139	10	72
α-helix	142-145	4
α-helix	155-162	8
β-strand	169-171	3	73
β-strand	173	1	74
α-helix	182-194	13
β-strand	199-201	3	74
β-strand	209	1	75
β-strand	212	1	75
α-helix	214-232	19
β-strand	237-239	3	74
β-strand	240-241	2	73
α-helix	247-260	14
β-strand	264-268	5	73
α-helix	269-272	4
α-helix	274-287	14
β-strand	290-294	5	73
α-helix	298-302	5
β-strand	308-309	2	72
α-helix	311-321	11
β-strand	325-327	3	73
β-strand	335	1	2
α-helix	339-350	12
β-strand	353-354	2	76
β-strand	357	1	77
α-helix	358-360	3
β-strand	362	1	77
β-strand	366-367	2	76
α-helix	371-374	4
β-strand	375-379	5	73
α-helix	384-386	3
α-helix	387-394	8
β-strand	399-401	3	73
α-helix	404-407	4
α-helix	413-432	20
α-helix	437-451	15
α-helix	453-462	10

12 more chain groups are not listed. Open the entry in the viewer and use the sequence panel to see them.

Molecules and chains

Molecule	Chains	Type	Length	Organism	UniProt
Large subunit of Rubisco	A, B, C, D, E, F, G, H, S, T, U, V, W, X, Y, Z	protein	475	Chlamydomonas reinhardtii	P00877 (AlphaFold model)
Small subunit of Rubisco	1, 2, 3, 4, 5, 6, 7, 8, I, J, K, L, M, N, O, P	protein	140	Chlamydomonas reinhardtii	P08475 (AlphaFold model)

Sequence of entity 1 (A, B, C, D, E, F, G, H, S, T, U, V, W, X, Y, Z), FASTA

>1IR2_1 Large subunit of Rubisco (chains A, B, C, D, E, F, G, H, S, T, U, V, W, X, Y, Z)
MVPQTETKAGAGFKAGVKDYRLTYYTPDYVVRDTDILAAFRMTPQPGVPPEECGAAVAAE
SSTGTWTTVWTDGLTSLDRYKGRCYDIEPVPGEDNQYIAYVAYPIDLFEEGSVTNMFTSI
VGNVFGFKALRALRLEDLRIPPAYVKTFVGPPHGIQVERDKLNKYGRGLLGCTIKPKLGL
SAKNYGRAVYECLRGGLDFTKDDENVNSQPFMRWRDRFLFVAEAIYKAQAETGEVKGHYL
NATAGTCEEMMKRAVCAKELGVPIIMHDYLTGGFTANTSLAIYCRDNGLLLHIHRAMHAV
IDRQRNHGIHFRVLAKALRMSGGDHLHSGTVVGKLEGEREVTLGFVDLMRDDYVEKDRSR
GIYFTQDWCSMPGVMPVASGGIHVWHMPALVEIFGDDACLQFGGGTLGHPWGNAPGAAAN
RVALEACTQARNEGRDLAREGGDVIRSACKWSPELAAACEVWKEIKFEFDTIDKL

Sequence of entity 2 (1, 2, 3, 4, 5, 6, 7, 8, I, J, K, L, M, N, O, P), FASTA

>1IR2_2 Small subunit of Rubisco (chains 1, 2, 3, 4, 5, 6, 7, 8, I, J, K, L, M, N, O, P)
MMVWTPVNNKMFETFSYLPPLSDEQIAAQVDYIVANGWIPCLEFAESDKAYVSNESAIRF
GSVSCLYYDNRYWTMWKLPMFGCRDPMQVLREIVACTKAFPDAYVRLVAFDNQKQVQIMG
FLVQRPKSARDWQPANKRSV

Ligands and cofactors

ID	Name	Formula	Copies
MG	Magnesium ion	Mg	16
CAP	2-carboxyarabinitol-1,5-diphosphate	C6 H14 O13 P2	16

Water and common crystallization additives (GOL) are not listed.

Primary citation

Crystal structure of activated ribulose-1,5-bisphosphate carboxylase/oxygenase from green alga Chlamydomonas reinhardtii complexed with 2-carboxyarabinitol-1,5-bisphosphate. Mizohata, E., Matsumura, H., Okano, Y. et al. J Mol Biol (2002) 316:679-691. DOI 10.1006/jmbi.2001.5381 · PubMed

Other PDB entries of the same protein (UniProt P00877 (AlphaFold model), which also has an AlphaFold model), best resolution first:

1GK8 1.4 Å, Rubisco from Chlamydomonas reinhardtii
2V6A 1.5 Å, Crystal structure of Chlamydomonas reinhardtii Rubisco with large- subunit mutations…
2V63 1.8 Å, Crystal structure of Rubisco from Chlamydomonas reinhardtii with a large-subunit V331A…
5BS2 1.97 Å, Crystal structure of RbcX-IIa from Chlamydomonas reinhardtii in complex with RbcL…
2V67 2.0 Å, Crystal structure of Chlamydomonas reinhardtii Rubisco with a large- subunit supressor…
1UW9 2.05 Å, L290F-A222T chlamydomonas Rubisco mutant
7JSX 2.06 Å, EPYC1(106-135) peptide-bound Rubisco
7JFO 2.13 Å, EPYC1(49-72)-bound Rubisco
1UZH 2.2 Å, A chimeric chlamydomonas, synechococcus rubisco enzyme
1UWA 2.3 Å, L290F mutant rubisco from chlamydomonas
2V68 2.3 Å, Crystal structure of Chlamydomonas reinhardtii Rubisco with large- subunit mutations…
2VDH 2.3 Å, Crystal structure of Chlamydomonas reinhardtii Rubisco with a large- subunit C172S…

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