Lysosomal protein transmembrane 4 alpha, or, LAPTM4A, is a human gene. Other names include: Lysosomal-associated transmembrane protein 4A; Golgi 4-transmembrane-spanning transporter MTP; HUMORF13; LAPTM4; MBNT; Mtrp. The encoded protein has an amino acid length of 233 and a mass of 26.8 kDa. Other isoforms may exist. Lysosomal protein transmembrane 4 alpha is a member of the LAPTM4/LAPTM5 transporter family. This gene shares homology with other species, including: Rat, Zebrafish, Chicken.