Abstract
Crosslinking of membrane-bound immunoglobulins, which are B-cell antigen receptors, causes proliferation and differentiation of B cells or inhibition of their growth. The receptor-mediated signaling involves tyrosine phosphorylation of cellular proteins and rapid activation of Src-like kinases. The amino acid sequences of five proteolytic peptides of p75, a major substrate of protein-tyrosine(s) in the signaling, showed that p75 is the human HS1 gene product. The HS1 gene is expressed specifically in hematopoietic cells and encodes p75HS1, which carries both helix-turn-helix and Src homology 3 motifs. p75HS1 showed rapid tyrosine phosphorylation and association with a Src-like kinase, Lyn, after crosslinking of membrane-bound IgM. Thus, p75HS1 may be an important substrate of Lyn and possibly other protein-tyrosine kinases upon B-cell antigen receptor-mediated signaling.
MeSH Terms
Adaptor Proteins, Signal Transducing
Amino Acid Sequence
Antibodies
Antibodies, Monoclonal
B-Lymphocytes/immunology,physiology
Blood Proteins/isolation & purification,metabolism
Electrophoresis, Polyacrylamide Gel
Humans
Immunoblotting
Leukocyte Common Antigens/isolation & purification
Molecular Sequence Data
Molecular Weight
Peptide Fragments/isolation & purification
Phosphoproteins/isolation & purification,metabolism
Phosphotyrosine
Protein-Tyrosine Kinases/metabolism
Receptors, Antigen, T-Cell/physiology
Signal Transduction
Tumor Cells, Cultured
Tyrosine/analogs & derivatives,analysis
Chemicals
Adaptor Proteins, Signal Transducing
Antibodies
Antibodies, Monoclonal
Blood Proteins
HCLS1 protein, human
Peptide Fragments
Phosphoproteins
Receptors, Antigen, T-Cell
Phosphotyrosine
Tyrosine
Protein-Tyrosine Kinases
Leukocyte Common Antigens
Authors & Affiliations
10 authors, click to expand affiliations / ORCID
Yamanashi Y
Department of Oncology, University of Tokyo, Japan.
Okada M
Semba T
Yamori T
Umemori H
Tsunasawa S
Toyoshima K
Kitamura D
Watanabe T
Yamamoto T
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