Mechanistic description
CHIP E3 Ligase Enhancement to Target Synaptic Proteins for Degradation
Evidence for (5)
CHIP ubiquitinates phosphorylated tau and mutant APP, promoting their degradation
CHIP knockout leads to neurodegeneration with protein aggregate accumulation
CHIP protein levels are reduced in AD temporal cortex compared to age-matched controls
Hsp70 ATPase modulators (KGPP) allosterically enhance CHIP ligase activity toward substrates
CHIP functions as quality-control checkpoint for Hsp70-bound substrates
Evidence against (6)
CHIP-mediated ubiquitination of tau generates Lys63-linked chains that are NOT degraded but propagate aggregation
CHIP knockout paradoxically protective in some tauopathy models
CHIP ubiquitinates Akt - impaired insulin signaling and metabolic dysfunction
CHIP's protective effects may derive from cochaperone activity, not ligase activity
KGPP compound has no BBB penetration or in vivo validation
CHIP reduction in AD may be protective to limit toxic ubiquitinated fragment generation
Bayesian persona consensus
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