Studies of a germinal centre B-cell expressed gene, GCET2, suggest its role as a membrane associated adapter protein.
GCET2 (Germinal centre B-cell expressed transcript 2; also named HGAL) is a newly cloned gene that has been shown to be a useful marker for germinal centre (GC) B cells and GC B-cell derived malignancies, including follicular lymphomas and germinal centre B cell-like diffuse large B-cell lymphomas (GCB-DLBCLs), and is a useful prognosticator for DLBCLs. We report here the biochemical and biological properties of GCET2, which may help to determine its role in the GC reaction. GCET2 is constitutively localised in the plasma membrane but is excluded from lipid rafts. GCET2 does not have a transmembrane domain, and its membrane localisation is mediated by myristoylation and palmitoylation. GCET2 has five conserved putative tyrosine phosphorylation sites, and it can be phosphorylated following pervanadate treatment in B cells. By serially mutating the five tyrosines, the third and fourth tyrosines were found to be essential for GCET2 phosphorylation. GCET2 was phosphorylated when co-transfected into COS7 cells with protein tyrosine kinases (PTKs) LYN, LCK or SYK, and therefore it could be a substrate of these kinases in B cells. The third tyrosine site ((107)YENV) of GCET2 is a consensus GRB2 binding site, and GCET2 was found to associate with GRB2 through the third tyrosine following phosphorylation. Our data suggests that GCET2 may be an adaptor protein in GC B cells that transduces signals from GC B-cell membrane to the cytosol via its association with GRB2.
Pan
Zenggang
Z
Department of Pathology and Microbiology, University of Nebraska Medical Center, Omaha, NE, USA.
Shen
Yulei
Y
Ge
Baosheng
B
Du
Cheng
C
McKeithan
Timothy
T
Chan
Wing C
WC
D048868:Adaptor Proteins, Signal Transducing / Q000378:metabolism*; D000818:Animals; D001402:B-Lymphocytes / Q000378:metabolism*; D001483:Base Sequence; D001665:Binding Sites; D019556:COS Cells; D045744:Cell Line, Tumor; D002462:Cell Membrane / Q000378:metabolism; D002522:Chlorocebus aethiops; D051380:GRB2 Adaptor Protein / Q000378:metabolism; D018858:Germinal Center / Q000378:metabolism*; D006801:Humans; D015151:Immunoblotting; D047908:Intracellular Signaling Peptides and Proteins; D008224:Lymphoma, Follicular / Q000378:metabolism; D016403:Lymphoma, Large B-Cell, Diffuse / Q000235:genetics* / Q000378:metabolism; D051379:Mice; D008840:Microfilament Proteins; D018613:Microscopy, Confocal; D008969:Molecular Sequence Data; D016297:Mutagenesis, Site-Directed; D009363:Neoplasm Proteins / Q000235:genetics / Q000378:metabolism*; D010766:Phosphorylation; D011505:Protein-Tyrosine Kinases / Q000378:metabolism; D016415:Sequence Alignment; D014161:Transduction, Genetic / Q000379:methods; D014162:Transfection / Q000379:methods; D014638:Vanadates / Q000494:pharmacology
D048868:Adaptor Proteins, Signal Transducing; C476824:GCSAM protein, human; D051380:GRB2 Adaptor Protein; D047908:Intracellular Signaling Peptides and Proteins; D008840:Microfilament Proteins; D009363:Neoplasm Proteins; C076715:pervanadate; D014638:Vanadates; D011505:Protein-Tyrosine Kinases