8QMV

L2 forming RubisCO derived from ancestral sequence reconstruction of the last common ancestor of Form I'' and Form I RubisCOs

X-RAY DIFFRACTION

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, SITTING DROP	8.5	289	Purified enzyme (10 mg/mL) in 25 mM Tricine-NaOH, 75 mM NaCl, pH 8.0 was incubated at 3% (v/v) CO2 in air and 30 degrees C for 1 hour in the presence of 0.3 mM CABP and 4.8 mM MgCl2. The enzyme was then mixed in a 1:1 ratio with 0.1 M TRIS pH 8.5, 0.2 M magnesium chloride, 30 % (v/v) polyethylene glycol 400. The crystals were flash frozen in liquid nitrogen.

Crystal Properties
Matthews coefficient	Solvent content
2.24	45

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 121.79	α = 90
b = 203.8	β = 90
c = 147.37	γ = 90

Symmetry
Space Group	C 2 2 21

Diffraction

Diffraction Experiment
ID #	Crystal ID	Scattering Type	Data Collection Temperature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1	1	x-ray	100	PIXEL	DECTRIS EIGER2 X CdTe 16M		2022-12-02	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	PETRA III, EMBL c/o DESY BEAMLINE P14 (MX2)	0.6888	PETRA III, EMBL c/o DESY	P14 (MX2)

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (Observed)	R Merge I (Observed)	Rrim I (All)	CC (Half)	Net I Over Average Sigma (I)	Redundancy	Number Reflections (All)	Number Reflections (Observed)	Observed Criterion Sigma (F)	Observed Criterion Sigma (I)	B (Isotropic) From Wilson Plot
1	1.85	24.97	99.9	0.113	0.11699999999999999	0.9990000000000001	16.04	13.9		155284

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	R Merge I (Observed)	Rrim I (All)	CC (Half)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
1	1.85	1.9			1.077	1.126	0.73

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Resolution (High)	Resolution (Low)	Cut-off Sigma (F)	Number Reflections (Observed)	Number Reflections (R-Free)	Percent Reflections (Observed)	R-Factor (Observed)	R-Work	R-Free	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	FREE R-VALUE	1.85	24.97	1.36	155237	1999	99.93	0.1609	0.1607	0.1739

Temperature Factor Modeling
Anisotropic B[1][1]	Anisotropic B[1][2]	Anisotropic B[1][3]	Anisotropic B[2][2]	Anisotropic B[2][3]	Anisotropic B[3][3]

RMS Deviations
Key	Refinement Restraint Deviation
f_dihedral_angle_d	12.245
f_angle_d	0.666
f_chiral_restr	0.045
f_plane_restr	0.008
f_bond_d	0.003

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	14174
Nucleic Acid Atoms
Solvent Atoms	1153
Heterogen Atoms	88

Software

Software
Software Name	Purpose
PHENIX	refinement
XSCALE	data scaling
XDS	data reduction
PHENIX	phasing

RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM157729.