Although ISRIB alone did not induce caspase-3 cleavage or caspase-3/7 activity in either cell line, it increased Gem's effects on cleaved caspase-3 levels and significantly enhanced caspase activity in both cell lines when compared to Gem alone.
Unfortunately, the β-substituted alcohol 1w was inactive because of the gem-dimethyl effect (2w).
In the presence of the enzyme, the quinone derivative transforms to the corresponding hydroquinone derivative, followed by the expected cyclizative cleavage reaction via the gem-dialkyl effect.
When a Rubel Freres diamond bracelet with a distinctive multi-gem wave effect first appeared at Christie's New York in 2001, it fetched $336,000.
Ying, Y, Kim, H, and Hong, J. "Efficient and stereoselective synthesis of 2,6-disubstituted piperidines through an organocatalytic aza-Michael reaction promoted by the gem-disubstituent effect". March 21 , 2010
Indeed, there is a 310 helical conformation for the backbone atoms of this PLM, although the P3' Aib residue slightly distorts the helical turn and deviates from the canonical 310-helix conformation adopted by I1 (Figure 8A), likely by virtue of the unusual geometric constrains of this residue, i.e, the gem-dimethyl effect [50].
Surprises included the inverse gem-dimethyl effect in 5- exo-cyclizations of iminyls and the interplay of spiro- with ortho-cyclization onto aromatics.
However, ISRIB markedly attenuated Gem's effects on the expression of genes involved in eIF2 signaling, NRF2-mediated oxidative stress responses, and protein kinase A pathways.
The main surprise in the SAR trend, as compared with hex-5-enyls, was that the 2,2-dimethyl-1-phenylpent-4-enyliminyl 2,2-dimethyl-1-phenylpent-4-enyliminyl 2,2-dimethyl-1-phenylpent-4-enyliminyl 2,2-dimethyl-1-phenylpent-4-enyliminyl 2,2-dimethyl-1-phenylpent-4-enyliminyl 2,2-dimethyl-1-phenylpent-4-enyliminyl
