Title:Protein Tyrosine Phosphatase Receptor-type Q: Structure, Activity, and
Implications in Human Disease
Volume: 29
Issue: 7
Author(s): Wansi Zhang, Zhimin Tang, Shipan Fan, Dingjin Yao, Zhen Zhang, Chenxi Guan, Wenxin Deng and Ying Ying*
Affiliation:
- Jiangxi Medical Center for Major Public Health Events, The First Affiliated Hospital of Nanchang University,
Nanchang, Jiangxi, 330013, China
- Jiangxi Province Key Laboratory of Tumor Pathogens and Molecular Pathology
and Department of Pathophysiology, Schools of Basic Medical Sciences, Nanchang University Medical College,
Nanchang, Jiangxi, 330006, China
- The Department of Respiratory and Critical Care Medicine, The First Affiliated Hospital of Nanchang University,
Nanchang, Jiangxi, 330006, China
Keywords:
Deafness, enzyme activity, PTPRQ, PTPs, cancer, transmembrane helix.
Abstract: Protein tyrosine phosphatase receptor-type Q (PTPRQ), a member of the type III tyrosine
phosphatase receptor (R3 PTPR) family, is composed of three domains, including 18 extracellular
fibronectin type III (FN3) repeats, a transmembrane helix, and a cytoplasmic phosphotyrosine
phosphatase (PTP) domain. PTPRQ was initially identified as a transcript upregulated in glomerular
mesangial cells in a rat model of glomerulonephritis. Subsequently, studies found that PTPRQ has
phosphotyrosine phosphatase and phosphatidylinositol phosphatase activities and can regulate cell
proliferation, apoptosis, differentiation, and survival. Further in vivo studies showed that PTPRQ is
necessary for the maturation of cochlear hair bundles and is considered a potential gene for
deafness. In the recent two decades, 21 mutations in PTPRQ have been linked to autosomal
recessive hearing loss (DFNB84) and autosomal dominant hearing loss (DFNA73). Recent
mutations, deletions, and amplifications of PTPRQ have been observed in many types of cancers,
which indicate that PTPRQ might play an essential role in the development of many cancers. In this
review, we briefly describe PTPRQ structure and enzyme activity and focus on the correlation
between PTPRQ and human disease. A profound understanding of PTPRQ could be helpful in the
identification of new therapeutic targets to treat associated diseases.