Spectrin beta chain, non-erythrocytic 5 (SPTBN5)

Spectrin beta chain, non-erythrocytic 5 (SPTBN5) is a large cytoskeletal protein encoded by the SPTBN5 gene on chromosome 15q15.1, containing 68 exons and producing a 3674-amino acid protein[1][2][3]. It is a member of the spectrin family responsible for linking membrane proteins and lipids to the actin cytoskeleton, thereby contributing to cell shape, mechanical stability, and intracellular transport[1][2][3]. SPTBN5 forms oligomers with alpha-spectrin and contains calponin homology domains (actin binding), spectrin repeats (flexibility and self-association), and a C-terminal pleckstrin homology domain (membrane recruitment)[1][3]. It is ubiquitously expressed, with significant roles in the brain and other organs[1]. Recent genetic data link biallelic SPTBN5 loss-of-function mutations to a syndrome characterized by intellectual disability, developmental delay, seizures, and, variably, aggressive behavior and mild dysmorphic features[1]. Other family members of spectrin are implicated in erythroid and neurological disorders, but SPTBN5 currently lacks therapeutic targeting or confirmed drug interactions[1][2].

Other names

Spectrin beta, non-erythrocytic 5SPTBN5BSPECVHUBSPECVHUSPECVBeta-V spectrinbeta V spectrinspectrin beta chain, non-erythrocytic 5spectrin beta chain, brain 4spectrin, non-erythroid beta chain 4