Table 1.

SAXS-derived size parameters for GAS1

I(0) (Guinier)	25.08
I(0) (Porod)	24.8
Dmax (nm)	10.5
Rg (Guinier/nm)	3.01
Rg (Porod/nm)	3.00
Porod volume (Vp)	54.2
Mw(theoretical)	29 158.3 g/mol
Mw(calc) (Guinier)	25.1 kDa
Mw(calc) (Porod vol.)	31.9 kDa (Vp/1.7)

The Guinier I(0)-value was calculated against an absolute reference (scattering of water relative to sample) [23] and the I(0) for the sample is then equal to the molecular weight. Molecular weight from the Porod volume is estimated according to Petoukhov et al. [24].