Secreted And Transmembrane Protein 1 (SECTM1)

SECTM1 encodes a transmembrane and secreted protein with characteristics of a type 1a transmembrane protein. It is found in a perinuclear Golgi-like pattern and thought to be involved in hematopoietic and/or immune system processes.

The predicted 248-amino acid K12 protein has the hydropathic characteristics of a type 1a transmembrane protein, which is defined by an extracellular N terminus and a cleaved signal peptide. The authors demonstrated that the K12 protein behaves biochemically as an integral membrane protein. Using immunofluorescence, they localized K12 to the Golgi. Western blotting showed that the K12 protein migrates as a cluster of bands at 27 kD. In addition, an approximately 20-kD soluble form of K12 is secreted by cells.