該基因編碼的蛋白是蛋白酪氨酸磷酸酶（PTP）家族的成員。眾所周知，PTP是調節多種細胞過程的信號分子，包括細胞生長、分化、有絲分裂周期和致癌轉化。該PTP具有一個細胞外區、一個跨膜區和兩個串聯胞質內催化域，因此代表一種受體型PTP。細胞外區包含3個免疫球蛋白樣結構域，9個非免疫球蛋白樣結構域與神經細胞粘附分子相似。這種PTP在粘附連接處上皮細胞接觸的調節以及β-連環蛋白信號的控制中起作用。這種蛋白在肥胖、胰島素抵抗個體的胰島素反應組織中的表達水平增加，可能有助于胰島素抵抗的發病機制。該基因的兩個選擇性剪接轉錄變體編碼不同的蛋白質，已被報道。
The protein encoded by this gene is a member of the protein tyrosine phosphatase (PTP) family. PTPs are known to be signaling molecules that regulate a variety of cellular processes including cell growth, differentiation, mitotic cycle, and oncogenic transformation. This PTP possesses an extracellular region, a single transmembrane region, and two tandem intracytoplasmic catalytic domains, and thus represents a receptor-type PTP. The extracellular region contains three Ig-like domains, and nine non-Ig like domains similar to that of neural-cell adhesion molecule. This PTP was shown to function in the regulation of epithelial cell-cell contacts at adherents junctions, as well as in the control of beta-catenin signaling. An increased expression level of this protein was found in the insulin-responsive tissue of obese, insulin-resistant individuals, and may contribute to the pathogenesis of insulin resistance. Two alternatively spliced transcript variants of this gene, which encode distinct proteins, have been reported.
