A single amino acid substitution (Pro23His) in the visual pigment Rhodopsin (Rh) is sufficient to cause massive retinal degeneration and blindness in retinitis pigmentosa (RP). The mechanisms linking the misfolded RhP23H to retinal degeneration remain obscure. Using cellular and Drosophila models of RP, I found that the ATP-dependent chaperone VCP is required to mediate ER extraction (retrotranslocation) and proteasomal delivery of misfolded RhP23H. Genetic and pharmacologic inactivation of VCP completely suppressed retinal degeneration and blindness caused by misfolded Rh in Drosophila. Therefore, excessive retrotranslocation and degradation of Rh might cause RP. Selective inhibition of VCP might prevent vision loss in RP patients carrying RhP23H mutations.
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A single amino acid substitution (Pro23His) in the visual pigment Rhodopsin (Rh) is sufficient to cause massive retinal degeneration and blindness in retinitis pigmentosa (RP). The mechanisms linking the misfolded RhP23H to retinal degeneration remain obscure. Using cellular and Drosophila models of RP, I found that the ATP-dependent chaperone VCP is required to mediate ER extraction (retrotranslocation) and proteasomal delivery of misfolded RhP23H. Genetic and pharmacologic inactivation of VCP...
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