HEX A
\hˈɛks ˈe͡ɪ], \hˈɛks ˈeɪ], \h_ˈɛ_k_s ˈeɪ]\
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An enzyme hydrolyzing terminal non-reducing N-acetyl-D-hexosamine residues in N-acetyl-beta-D-hexosaminides. It acts on glucosides, galactosides, and several oligosaccharides. Hexosaminidase A cleaves GM2, GA2, globosides, and hexosamine oligosaccharides. Deficiency of this isoenzyme causes TAY-SACHS DISEASE. Hexosaminidase B cleaves all the above substrates except GM2. A deficiency of both A and B causes SANDHOFF DISEASE. The enzyme has also been used as a tumor marker to distinguish between malignant and benign disease. EC 3.2.1.52.
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Proto Oncogene Proteins c erbB 2
- cell surface protein-tyrosine kinase that is found to be overexpressed in significant number adenocarcinomas. It has extensive homology can heterodimerize EGF EPIDERMAL GROWTH FACTOR), 3 receptor (RECEPTOR, 3) and the 4 receptor. Activation of erbB-2 receptor occurs during heterodimer formation with a ligand-bound erbB family members. EC 2.7.11.-.