The quest for pharmacological chaperones for the treatment of Pompe disease

Session: 
S9.1 Glycosidase structure and function
Code: 
KL9.1
Location (hall): 
Glucose
Start/end time: 
Thursday, July 4, 2019 - 15:00 to 15:30
Speaker reference: 
Gerlind
Sulzenbacher

Gerlind Sulzenbacher1, Véronique  Roig-Zamboni1, Beatrice Cobucci-Ponzano2, Roberta Iacono2, Giancarlo Parenti3,4, Marco Moracci2

1Architecture et Fonction des Macromolécules Biologiques, UMR7257 CNRS, Aix-Marseille Université, Marseille, France, 2Institute of Biosciences and Bioresources, National Research Council, Napoli, Italy, 3Telethon Institute of Genetics and Medicine, TIGEM , Napoli, Italy, 4Department of Pediatrics, Università degli Studi di Napoli Federico II, Napoli, Italy

Pompe disease is an inborn metabolic myopathy caused by deficiency of the lysosomal enzyme acid α-glucosidase (GAA) and characterized by glycogen accumulation in lysosomes causing severe secondary cellular damage resulting in progressive motor handicap and premature death. We have previously determined the high-resolution crystal structure of recombinant human GAA (rhGAA), the standard care of Pompe disease, in its unbound form and in complex with inhibitors [1]. These structures provide the molecular framework for the rationalization of mutations associated with fatal infantile Pompe disease, offering guidance for therapeutic approaches and affording an accurate tool for in silico screening for molecules serving for future therapies. Although since its approval in 2006 enzyme replacement therapy for Pompe disease with rhGAA shows clinical benefits, the treatment is limited by variable patient’s response, insufficient targeting and uptake in muscle tissues and immunogenic reactions. Pharmacological chaperone therapy (PCT), based on the concept that small-molecule ligands may block conformational fluctuations of a partially misfolded protein, rescuing its functional state, has been recognized as an appealing alternative therapeutic approach to ERT. Furthermore, pharmacological chaperones can act as enzyme enhancers when co-administered with rhGAA, by favouring enzyme delivery, stability and maturation, making PCT independent from the type of mutation carried by patients. We had already determined the 3-D structure of rhGAA in complex with the pharmacological chaperone N-acetyl-cysteine [2] which provided hints of its stabilizing function at the molecular level. Here we will present our latest results on structural studies of rhGAA in complex with small molecules which bear the potential of serving as selective pharmacological chaperones for the treatment of Pompe patients.

References: 
  1. Roig-Zamboni, V.; Cobucci-Ponzano, B.; Iacono R.; Ferrara, M.C.; Germany, S.; Bourne, Y.; Parenti, G.; Moracci, M.; Sulzenbacher, G. Structure of human lysosomal acid α-glucosidase - a guide for the treatment of Pompe disease. Nat. Commun. 2017, 8 (1), 1111. 
  2. Porto, C.; Ferrara, M.C.; Meli, M.; Acampora, E.; Avolio, V.; Rosa, M.; Cobucci-Ponzano, B.; Colombo, G.; Moracci, M.; Andria, G.; Parenti, G. Pharmacological enhancement of α-glucosidase by the allosteric chaperone N-acetylcysteine. Mol. Ther. 2012, 20(12), 2201-2011.

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