Table 1.

Mass estimates for PufL-modified oligomeric reaction centres.

Construct	Mass (kDa)
	Theoreticala	Analytical gel filtrationb	Sedimentation velocity AUCc	Equilibrium AUCd
WT	104	163	95.8	130 ± 6
L-Di	216	447	219	236 ± 2
L-Tri	324	633	307	375 ± 31
L-Tet	436	734	320	517 ± 30

^aMass estimated from the protein sequence and masses of the cofactors.

^bMass estimated using a calibration curve based on gel filtration standards.

^cMass estimated from sedimentation coefficients in Sedfit.

^dMass determined by curve fitting in Ultrascan II.