Table 1.

Viscosity coefficient $b$, clustering propensity $\zeta$, Baxter parameter $\tau$, and effective dissociation constant $K_d$ for nonspecific protein–protein binding in concentrated solutions of UBQ, GB3, LYZ, and VIL

Protein	$b$,mPa$\cdot$s	$\zeta$	${\tau }^{\text{cl}}$	$K_d^{\text{cl}}$, mM	${\tau }^{\text{RDF}}$	$K_d^{\text{RDF}}$, mM	${\tau }^{D_t}$	$K_d^{D_t}$, mM	${\tau }^{k_{\text{off}}}$	$K_d^{k_{\text{off}}}$, mM	${\tau }^{\eta }$	$K_d^{\eta }$, mM
UBQ	55.3	8.2	0.12	19	0.13	21	0.13	21	0.49	$\sim$80	0.038	6.1
GB3	63.1	8.8	0.11	26	0.19	44	0.13	30	0.34	$\sim$80	0.033	7.6
LYZ	32.5	3.6	0.27	26	—	—	—	—	0.80	$\sim$80	0.071	6.9
VIL	56.2	11.6	0.09	28	—	—	0.13	43	0.24	$\sim$80	0.037	12.2

${\tau }^{\text{cl}}$ and $K_d^{\text{cl}}$ are from cluster sizes, ${\tau }^{\text{RDF}}$ and $K_d^{\text{RDF}}$ are from radial distribution function g(r), ${\tau }^{D_t}$ and $K_d^{D_t}$ are from $D_t^{߰}$ (ɸ) at low protein concentration, ${\tau }^{k_{\text{off}}}$ and $K_d^{k_{\text{off}}}$ are from binding off rates, and ${\tau }^{\eta }$ and $K_d^{\eta }$ are from viscosity term b.