38XY | pdb_000038xy

Crystal structure of a Formate acetyltransferase (PFL) from Megasphaera lornae with an acetylated active site cysteine and flipped catalytic loop

X-RAY DIFFRACTION

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Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
in silico model	AlphaFold	AF-D3LWI4-F1

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, SITTING DROP	6.5	291	Morpheus G4: 12.5%(v/v) MPD, 12.5%(v/v) PEG 1000, 12.5%(w/v) PEG 3350, 100 mM Imidazole/MES, pH 6.5, 20 mM Sodium formate, 20 mM Ammonium acetate, 20 mM Sodium citrate tribasic, 20 mM Potassium sodium tartrate and 20 mM Sodium oxamate, MeloA.20507.a.A1.PW39574 at 27.7 mg/mL. plate 21260 G4 d1, Cocrystallization with pyruvate but was not bound. Active site Cys 413 was acetylated, Puck: PSL-0610, Cryo: direct, The 723:727 loop has partial is flipped from the "normal" conformation

Crystal Properties
Matthews coefficient	Solvent content
2.69	54.19

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 119.268	α = 90
b = 218.478	β = 90
c = 144.988	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 XE 9M		2026-07-26	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	NSLS-II BEAMLINE 19-ID	0.9786	NSLS-II	19-ID

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (Observed)	R Merge I (Observed)	Rrim I (All)	Rpim 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	1.93	49.23	100	0.119	0.124	0.033	0.999	15.7	13.6		141538

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	R Merge I (Observed)	Rrim I (All)	Rpim I (All)	CC (Half)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
1	1.93	1.98		99.9	1.631	1.698	0.468	0.83		13.1

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 (Depositor)	R-Work (DCC)	R-Free (Depositor)	R-Free (DCC)	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	FREE R-VALUE	1.93	49.23	1.34	141277	6943	99.81	0.1504	0.1488	0.1577	0.1798	0.1876

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	14.147
f_angle_d	0.934
f_chiral_restr	0.052
f_plane_restr	0.009
f_bond_d	0.008

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	12056
Nucleic Acid Atoms
Solvent Atoms	963
Heterogen Atoms	77

Software

Software
Software Name	Purpose
PHENIX	refinement
Aimless	data scaling
XDS	data reduction
PHASER	phasing
PDB_EXTRACT	data extraction