BEST3

BEST3 belongs to the bestrophin family of anion channels, which includes BEST1 (MIM 607854), the gene mutant in vitelliform macular dystrophy (VMD; MIM 153700), and 2 other BEST1-like genes, BEST2 (MIM 607335) and BEST4 (MIM 607336). Bestrophins are transmembrane (TM) proteins that share a homology region containing a high content of aromatic residues, including an invariant arg-phe-pro (RFP) motif. The bestrophin genes share a conserved gene structure, with almost identical sizes of the 8 RFP-TM domain-encoding exons and highly conserved exon-intron boundaries. Each of the 4 bestrophin genes has a unique 3-prime end of variable length (Stohr et al., 2002 [PubMed 12032738]; Tsunenari et al., 2003 [PubMed 12907679]).

Bestrophin 3

Forms calcium-sensitive chloride channels. Permeable to bicarbonate.

Chloride transport Source: UniProtKB-KW
Negative regulation of ion transport Source: Ensembl

Cell membrane

Cytoplasmic: 1-25 aa
Helical: 26-46 aa
Extracellular: 47-70 aa
Helical: 71-91 aa
Cytoplasmic: 92-178 aa
Helical: 179-199 aa
Extracellular: 200-228 aa
Intramembrane: 229-249 aa
Extracellular: 250-270 aa
Helical: 271-291 aa
Cytoplasmic: 292-668 aa