Smallbone et al. [ 56] develop these ideas and construct a schematic model that suggests that transient exercise-induced acidosis may be sufficient to disrupt these critical somatic mutations; this may mediate the observed reduction of cancer risk with exercise.
These mutations may therefore mediate the antimalarial drug response by reducing AP2-mu binding affinity to the membrane cargo and thus decreasing the efficiency of endocytotic trafficking of membrane proteins.
It is likely that other mutations exist and that they may mediate altered enzyme activity in these individuals [32].
This could imply that while the functional impact of each individual mutation is limited, collectively they may mediate the signaling pathway activity through epistasis.
The function of LRRK2 remains largely elusive but G2019S mutations enhance its kinase activity, which may mediate neural toxicity [ 72].
These results suggested that residue F595 is also important in the constitutive signaling of JAK2 T875N and JAK2 R683G and initially to JAK2 K539L, implying that activation of catalysis by JAK mutations may be mediated by conformational changes in the JH2 αC helix.
The finding that serum- and LPA-induced DNA synthesis are affected by the Tyr845Phe mutation suggests that other cell-surface receptors may mediate their effects in part through the EGF receptor.
This finding suggests that one or just a few substances with DNA editing capacity may mediate both deletions and point mutations within the tyrosine kinase domain of the EGFR.
Overexpression of Parkin eliminates mitochondria with deleterious mutations in cytochrome oxidase subunit I (COXI) (Suen et al., 2010), suggesting that Parkin may mediate a mitochondrial quality control pathway to maintain organelle homeostasis.
In this regard, an emblematic case is offered by recent experiments involving mutations and kinetic studies on the enzyme tyramine β-monooxygenase, where the aromatic ring of the amino acid Tyr216 may mediate a long-range interdomain ET process crucial to the enzymatic mechanism, and the Tyr-to-Ala mutation causes a drastic decrease in the observed ET rate.
