Title:The Cooperative Effect between Polybasic Region (PBR) and Polysialyltransferase Domain (PSTD) within Tumor-Target Polysialyltranseferase ST8Sia II
Volume: 19
Issue: 31
Author(s): Guo-Ping Zhou*, Si-Ming Liao, Dong Chen and Ri-Bo Huang*
Affiliation:
- National Engineering Research Center for Non-Food Biorefinery, State Key Laboratory of Non-Food Biomass and Enzyme Technology, Guangxi Key Laboratory of Bio-refinery, Guangxi Academy of Sciences, 98 Daling Road, Nanning, 530007,China
- National Engineering Research Center for Non-Food Biorefinery, State Key Laboratory of Non-Food Biomass and Enzyme Technology, Guangxi Key Laboratory of Bio-refinery, Guangxi Academy of Sciences, 98 Daling Road, Nanning, 530007,China
Keywords:
Tumor metastasis, Polysialic acid (polySia), Polysialyltransferase domain (PSTD), Polybasic region (PBR), ST8Sia
II (STX), ST8Sia IV (PST), Neural cell adhesion molecules (NCAM), Polysialylation, Protein 3D structure, Phyre2 sever.
Abstract: ST8Sia II (STX) is a highly homologous mammalian polysialyltransferase (polyST), which is
a validated tumor-target in the treatment of cancer metastasis reliant on tumor cell polysialylation.
PolyST catalyzes the synthesis of α2,8-polysialic acid (polySia) glycans by carrying out the activated
CMP-Neu5Ac (Sia) to N- and O-linked oligosaccharide chains on acceptor glycoproteins. In this review
article, we summarized the recent studies about intrinsic correlation of two polybasic domains, Polysialyltransferase
domain (PSTD) and Polybasic region (PBR) within ST8Sia II molecule, and suggested
that the critical amino acid residues within the PSTD and PBR motifs of ST8Sia II for polysialylation of
Neural cell adhesion molecules (NCAM) are related to ST8Sia II activity. In addition, the conformational
changes of the PSTD domain due to point mutations in the PBR or PSTD domain verified an intramolecular
interaction between the PBR and the PSTD. These findings have been incorporated into
Zhou’s NCAM polysialylation/cell migration model, which will provide new perspectives on drug research
and development related to the tumor-target ST8Sia II.