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SLC52A3 Riboflavin transporter. Riboflavin transport is Na(+)- independent but moderately pH-sensitive. Activity is strongly inhibited by riboflavin analogs, such as lumiflavin, flavin mononucleotide (FMN) and flavin adenine dinucleotide (FAD), and to a lesser extent by amiloride. Defects in SLC52A3 are the cause of Brown-Vialetto-Van Laere syndrome type 1 (BVVLS1). A rare autosomal recessive neurologic disorder characterized by sensorineural hearing loss and a variety of cranial nerve palsies, which develop over a relatively short period of time in a previously healthy individual. Sensorineural hearing loss may precede the neurological signs. The course is invariably progressive, but the rate of decline is variable within and between families. With disease evolution, long tract signs, lower motor neuron signs, cerebellar ataxia, and lower cranial nerve (III-VI) palsies develop, giving rise to a complex picture resembling amyotrophic lateral sclerosis. Diaphragmatic weakness and respiratory compromise are some of the most distressing features, leading to recurrent chest infections and respiratory failure, which are often the cause of patients' demise. Defects in SLC52A3 are the cause of Fazio-Londe disease (FALOND). A rare neurological disease characterized by progressive weakness of the muscles innervated by cranial nerves of the lower brain stem. It may present in childhood with severe neurological deterioration with hypotonia, respiratory insufficiency leading to premature death, or later in life with bulbar weakness which progresses to involve motor neurons throughout the neuroaxis. Clinical manifestations include dysarthria, dysphagia, facial weakness, tongue weakness, and fasciculations of the tongue and facial muscles. Belongs to the riboflavin transporter family. 2 isoforms of the human protein are produced by alternative splicing. Note: This description may include information from UniProtKB.
Protein type: Membrane protein, integral; Membrane protein, multi-pass
Chromosomal Location of Human Ortholog: 20p13
Cellular Component: integral to plasma membrane; plasma membrane
Molecular Function: riboflavin transporter activity
Biological Process: riboflavin metabolic process; riboflavin transport; sensory perception of sound
Disease: Brown-vialetto-van Laere Syndrome 1; Fazio-londe Disease
Reference #:  Q9NQ40 (UniProtKB)
Alt. Names/Synonyms: bA371L19.1; BVVLS; C20orf54; chromosome 20 open reading frame 54; CT054; hRFT2; hypothetical protein LOC113278; MGC10698; RFT2; Uncharacterized protein C20orf54
Gene Symbols: SLC52A3
Molecular weight: 50,805 Da
Basal Isoelectric point: 5.46  Predict pI for various phosphorylation states
Select Structure to View Below


Protein Structure Not Found.

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