Abstract:
:The thrombopoietin receptor, also known as c-Mpl, is a member of the cytokine superfamily, which regulates the differentiation of megakaryocytes and formation of platelets by binding to its ligand, thrombopoietin (TPO), through Janus kinase (JAK)-signal transducer and activator of transcription (STAT) signaling. The loss-of-function mutations of c-Mpl cause severe thrombocytopenia due to impaired megakaryocytopoiesis, and gain-of-function mutations cause thrombocythemia. c-Mpl contains two Trp-Ser-Xaa-Trp-Ser (Xaa represents any amino acids) sequences, which are characteristic sequences of type I cytokine receptors, corresponding to C-mannosylation consensus sequences: Trp-Xaa-Xaa-Trp/Cys. C-mannosylation is a post-translational modification of tryptophan residue in which one mannose is attached to the first tryptophan residue in the consensus sequence via C-C linkage. Although c-Mpl contains some C-mannosylation sequences, whether c-Mpl is C-mannosylated or not has been uninvestigated. We identified that c-Mpl is C-mannosylated not only at Trp(269) and Trp(474), which are putative C-mannosylation site, but also at Trp(272), Trp(416), and Trp(477). Using C-mannosylation defective mutant of c-Mpl, the C-mannosylated tryptophan residues at four sites (Trp(269), Trp(272), Trp(474), and Trp(477)) are essential for c-Mpl-mediated JAK-STAT signaling. Our findings suggested that C-mannosylation of c-Mpl is a possible therapeutic target for platelet disorders.
journal_name
Biochem Biophys Res Communjournal_title
Biochemical and biophysical research communicationsauthors
Sasazawa Y,Sato N,Suzuki T,Dohmae N,Simizu Sdoi
10.1016/j.bbrc.2015.10.116subject
Has Abstractpub_date
2015-12-04 00:00:00pages
262-8issue
1-2eissn
0006-291Xissn
1090-2104pii
S0006-291X(15)30815-9journal_volume
468pub_type
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