Aryl Hydrocarbon Receptor-interacting Protein-like 1 Is an Obligate Chaperone of Phosphodiesterase 6 and Is Assisted by the γ-Subunit of Its Client.
Phosphodiesterase 6 (PDE6) is the effector enzyme in the phototransduction cascade and is critical for the health of both rod and cone photoreceptors. Its dysfunction, caused by mutations in either the enzyme itself or AIPL1 (aryl hydrocarbon receptor-interacting protein-like 1), leads to retinal diseases culminating in blindness. Progress in research on PDE6 and AIPL1 has been severely hampered by failure to express functional PDE6 in a heterologous expression system. Here, we demonstrated that AIPL1 is an obligate chaperone of PDE6 and that it enables low yield functional folding of cone PDE6C in cultured cells. We further show that the AIPL1-mediated production of folded PDE6C is markedly elevated in the presence of the inhibitory Pγ-subunit of PDE6. As illustrated in this study, a simple and sensitive system in which AIPL1 and Pγ are co-expressed with PDE6 represents an effective tool for probing structure-function relationships of AIPL1 and reliably establishing the pathogenicity of its variants.
From the Departments of Molecular Physiology and Biophysics and.
Kota N
KN
Gopalakrishna
From the Departments of Molecular Physiology and Biophysics and.
Kimberly
K
Boyd
From the Departments of Molecular Physiology and Biophysics and.
Ravi P
RP
Yadav
From the Departments of Molecular Physiology and Biophysics and Ophthalmology and Visual Sciences, University of Iowa Carver College of Medicine, Iowa City, Iowa 52242 nikolai-artemyev@uiowa.edu.
Nikolai O
NO
Artemyev
D048868:Adaptor Proteins, Signal Transducing / Q000235:genetics / Q000378:metabolism*; D000818:Animals; D019556:COS Cells; D002522:Chlorocebus aethiops; D054707:Cyclic Nucleotide Phosphodiesterases, Type 6 / Q000235:genetics / Q000378:metabolism*; D057809:HEK293 Cells; D006801:Humans; D051379:Mice; D018832:Molecular Chaperones / Q000235:genetics / Q000378:metabolism*; D012164:Retinal Diseases / Q000235:genetics / Q000378:metabolism*
D048868:Adaptor Proteins, Signal Transducing; C498604:Aipl1 protein, mouse; D018832:Molecular Chaperones; D054707:Cyclic Nucleotide Phosphodiesterases, Type 6; C517444:Pde6g protein, mouse
chaperone; phosphodiesterases; photoreceptor; phototransduction; protein folding