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The insulin/insulin growth factor (IGF) signaling (IIS) pathway is a key regulator of aging of worms, flies, mice, and likely humans. Delayed aging by IIS reduction protects the nematode C. elegans from toxicity associated with the aggregation of the Alzheimer's disease-linked human peptide, Aβ. We reduced IGF signaling in Alzheimer's model mice and discovered that these animals are protected from...
Loss-of-function diseases are often caused by a mutation in a protein traversing the secretory pathway that compromises the normal balance between protein folding, trafficking, and degradation. We demonstrate that the innate cellular protein homeostasis, or proteostasis, capacity can be enhanced to fold mutated enzymes that would otherwise misfold and be degraded, using small molecule proteostasis...
Sexual intercourse is the major route of HIV transmission. To identify endogenous factors that affect the efficiency of sexual viral transmission, we screened a complex peptide/protein library derived from human semen. We show that naturally occurring fragments of the abundant semen marker prostatic acidic phosphatase (PAP) form amyloid fibrils. These fibrils, termed Semen-derived Enhancer of Virus...
To provide an integrated view of endoplasmic reticulum (ER) function in protein export, we have described the interdependence of protein folding energetics and the adaptable biology of cellular protein folding and transport through the exocytic pathway. A simplified treatment of the protein homeostasis network and a formalism for how this network of competing pathways interprets protein folding kinetics...
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