Calcium-activated nucleotidase 1 (CANT1)

Calcium-activated nucleotidase 1 (CANT1) is a calcium-dependent enzyme localized primarily in the endoplasmic reticulum and Golgi apparatus, where it functions as a nucleoside diphosphatase. It exhibits a high substrate preference for UDP and GDP, converting them into UMP and GMP, respectively, which is a crucial step in the recycling of nucleotide sugars used for protein and proteoglycan glycosylation [UniProt: Q8WVQ1]. This enzymatic activity is vital for the synthesis of glycosaminoglycans, which are essential components of the extracellular matrix in cartilage and bone [NCBI Gene: 124583]. Clinically, loss-of-function mutations in the CANT1 gene are the underlying cause of Desbuquois dysplasia, a rare and severe skeletal dysplasia characterized by growth retardation and joint abnormalities [OMIM: 613165]. While there are currently no approved drugs that specifically target or modulate CANT1 activity, it remains a significant focus for understanding skeletal development and potential gene therapy approaches for chondrodysplasias [PubMed: 20036351]. The enzyme's strict requirement for calcium ions suggests a regulatory link between Golgi calcium homeostasis and the efficiency of the secretory pathway [PubMed: 12145310].

Other names

CANT1SCAN-1SHAPYSoluble calcium-activated nucleotidase 1Apyrase-like protein 1UDP-glycosyltransferase-associated nucleotidasePutative apyrase-like protein 1

Hydrolysis of nucleoside diphosphates (specifically UDP and GDP) in a calcium-dependent manner to regulate nucleotide sugar levels in the Golgi apparatus, facilitating the recycling of UMP and GMP for further nucleotide sugar transport.