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Table 2 Mutant RGS4 Gαo binding affinities and 5nd logIC50s.

From: A covalent peptide inhibitor of RGS4 identified in a focused one-bead, one compound library screen

Mutant

o affinity (nM)

5nd logIC50 (M)

wild type

11.6 ± 1.4

-4.36 ± 0.03###

C95A

8.17 ± 1.5

-4.71 ± 0.05###

C148A

6.84 ± 1

-4.27 ± 0.05#

C71A

12.2 ± 1.8

-4.34 ± 0.06##

C132A

7.9 ± 3.1

-3.86 ± 0.07

-7C

8.3 ± 1

-3.24 ± 0.14***

A95C, -7C

12 ± 2

-3.58 ± 0.09**

A148C, -7C

5.7 ± 0.2

-3.51 ± 0.09**

A71C, -7C

9.2 ± 2

-3.20 ± 0.13**

A132C, -7C

12.5 ± 1

-3.41 ± 0.09**

no Cys in RGS domain

3.9 ± 0.8

-3.80 ± 0.06*

no Cys in C-terminus

5.0 ± 0.7

-4.39 ± 0.07##

  1. o affinities were calculated in the FCPIA as described and logIC50 data is from Figure 5. (mean ± S.E.M., n ≥ 3) *p < 0.05, **p < 0.01, ***p < 0.001 compared to wild type RGS4Δ51N; #p < 0.05, ##p < 0.01, ###p < 0.001 compared to -7C RGS4Δ51N.