Table S2.

Data collection and refinement statistics for δ-COP MHD complexed with WxWxV and WxxxW peptides and without peptide

	δ-COP MHD W404A native with Dsl1p WxWxV peptide merohedrally twinned	δ-COP MHD WT native	δ-COP MHD W404A SeMet with Dsl1p WxxxW peptide
Data collection
Beamline	Diamond I03	Diamond I02	Diamond I04-1
Space group	P3121	P212121	P3121
Wavelength, Å	0.96863	1.0	0.91732
Cell dimensions
a, b, c, Å	72.8, 72.8, 343.3	86.9, 148.6, 222.7	72.9, 72.9, 340.9
α, β, γ, °	90.0, 90.0, 120.0	90.0, 90.0, 90.0	90.0, 90.0, 120.0
Resolution range, Å*	36.4–1.90 (1.94–1.90)	48.4–3.00 (3.16–3.00)	85.2–2.75 (2.9–2.75)
Rmerge*,†	0.129 (0.713)	0.098 (0.869)	0.117
Rmeas*,‡	0.137 (0.755)	0.115 (1.020)	0.219 (0.598)
CC1/2*,§	0.994 (0.643)	0.997 (0.448)	0.974 (0.577)
Mean I/σI*	11.3 (3.4)	8.5 (1.7)	6.1 (2.8)
Completeness, %*	98.3 (98.3)	99.8 (99.9)	97.8 (95.9)
Multiplicity*	9.1 (9.2)	3.6 (3.6)	5.5 (4.7)
Wilson <B>, Å2	19.1	95.1
No. of twin domains	2
Twin fractions, %, h,k,l/-h,-k,l	0.59/0.41
Refinement
Resolution range, Å	36.4–1.90	48.4–3.00
No. of reflections	78,953	554,31
Rwork/Rfree	0.136/0.189	0.195/0.233
Number of atoms
Protein	8,217	16,523
Ligand/ion	240	2
Water	589	288
B-factors, Å2	28.0	92.6
Rmsd from ideal values
Bond lengths, Å	0.020	0.010
Bond angles, °	2.11	1.38
Ramachandran plot
Favored region, %	95.9	95.8
Allowed, %	3.4	3.4
Outliers, %	0.7	0.8
Rotamer outliers, %	2.1	2.1
C-beta outliers	8	8
PDB ID code	5FJZ	5FK0

^*Values in parentheses are for the highest resolution shell.

^†R_merge = Σ(I_hl - <I_h>)/Σ(I_hl) where <I_h> is the mean intensity of unique reflection h, summed over all reflections for each observed intensity I_hl.

^‡R_meas = Σ(n/n – 1)^1/2 (I_hl - <I_h>)/Σ(I_hl) where n is the number of observations for unique reflection h with mean intensity <I_h>, summed over all reflections for each observed intensity I_hl.

^§CC_1/2 is the correlation coefficient on <I> between random halves of the dataset. Δ_anom, anomalous difference I⁺ − I⁻.