Cheong, Jin-Gyu Song, Dae-Geun Song, Haeng Eun Berditchevski, Fedor Nam, Seo Hee Jung, Jae Woo Kim, Hye-Jin Kim, Ji Eon Kim, Somi Ryu, Jihye Cho, Chang Yun Lee, Kyung-Min Lee, Jung Weon 2024-01-20T02:03:21Z 2024-01-20T02:03:21Z 2021-09-01 2017-02-21 1949-2553 https://pubs.kist.re.kr/handle/201004/123049 The transmembrane 4 L six family proteins TM4SF1, TM4SF4, and TM4SF5 share 40-50% overall sequence identity, but their C-terminus identity is limited. It may be likely that the C-termini of the members are important and unique for own regulatory functions. We thus examined how the TM4SF5 C-terminus affected cellular functions differentially from other family members. Using colon cancer cells expressing wildtype (WT), C-terminus-deleted, or chimeric mutants, diverse cellular functions were explored in 2-dimensional (2D) and 3-dimensional (3D) condition. The C-termini of the proteins were relatively comparable with respect to 2D cell proliferation, although each C-terminal-deletion mutant exhibited increased proliferation relative to the WT. Using chimeric constructs, we found that the TM4SF5 C-terminus was critical for regulating the diverse metastatic functions of TM4SF5, and could positively replace the C-termini of other family members. Replacement of the TM4SF1 or TM4SF4 C-terminus with that of TM4SF5 increased spheroids growth, transwell migration, and invasive dissemination from spheroids in 3D collagen gels. TM4SF5-mediated effects required its extracellular loop 2 linked to the C-terminus via the transmembrane domain 4, with causing c-Src activation. Altogether, the C-terminus of TM4SF5 appears to mediate pro-migratory roles, depending on a structural relay from the second extracellular loop to the C-terminus. English IMPACT JOURNALS LLC SUPERFAMILY MEMBER 4 LIVER TM4SF4 OVEREXPRESSION TETRASPANINS MICRODOMAINS HEPATOCYTES CARCINOMA ROLES CELLS Differential regulation of cellular functions by the C-termini of transmembrane 4 L six family proteins in 2-or 3-dimensional environment Article 10.18632/oncotarget.14809 1 ONCOTARGET, v.8, no.8, pp.13277 - 13292 ONCOTARGET 8 8 13277 13292 scie scopus 000395692000072 2-s2.0-85013384895 Oncology Cell Biology Oncology Cell Biology Article SUPERFAMILY MEMBER 4 LIVER TM4SF4 OVEREXPRESSION TETRASPANINS MICRODOMAINS HEPATOCYTES CARCINOMA ROLES CELLS 3D cell culture migration proliferation spheroids transmembrane 4 L six family