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Nerve growth factor binds to the TrkA and p75(NTR) (p75) and generates signals leading to neuronal cell survival, differentiation, and programmed cell death. Here we describe a series of experiments involving selective activation of either TrkA or p75 in which distinct cell-signaling intermediates promote different cellular consequences. We analyzed(More)
Using partial amino acid sequence data derived from porcine methionyl aminopeptidase (MetAP; methionine aminopeptidase, peptidase M; EC, a full-length clone of the homologous human enzyme has been obtained. The cDNA sequence contains 2569 nt with a single open reading frame corresponding to a protein of 478 amino acids. The C-terminal portion(More)
The amino acid sequence of porcine heart mitochondrial malate dehydrogenase (mMDH; L-malate: NAD+ oxidoreductase, EC has been compared with the sequences of six different lactate dehydrogenases (LDH; L-lactate: NAD+ oxidoreductase, EC and with the "x-ray" sequence of cytoplasmic malate dehydrogenase (sMDH). The main points are that (i)(More)
Recent studies on nerve growth factor have revealed important new insights into the structure, function and evolution of this prototypical neurotrophic factor. Some of its features are (1) it has a unique three-dimensional fold that has since been found in two other growth factors, (2) it uses the trk proto-oncogene product, which has a tyrosine kinase, as(More)
Removal of the initiator methionine and/or acetylation of the alpha-amino group are among the earliest possible chemical modifications that occur during protein synthesis in eukaryotes. These events are catalyzed by methionine aminopeptidase and N alpha-acetyltransferase, respectively. Recent advances in the isolation and characterization of these enzymes(More)
Polypeptides synthesized in the cytoplasm of eukaryotes are generally initiated with methionine, but N-terminal methionine is absent from most mature proteins. Many proteins are also N alpha-acetylated. The removal of N-terminal methionine and N alpha-acetylation are catalyzed by two enzymes during translation. The substrate preferences of the methionine(More)
Differentiation and survival of neuronal cell types requires the action of neurotrophic polypeptides such as nerve growth factor (NGF). In the central and peripheral nervous system and the phaeochromocytoma cell model PC12, NGF exerts its effects through the activation of the signalling capacity of Trk, a receptor tyrosine kinase (RTK) which upon(More)
Two different isoenzymes of fructose-P2 aldolase can be resolved by chromatography of crude spinach leaf extracts on DEAE-cellulose columns. The acidic isoenzyme comprises about 85% of the total leaf aldolase activity. The two forms differ in primary structure as judged by their distinctive amino acid compositions, tryptic peptide patterns, and(More)
Stably transfected PC12 cell lines expressing similar amounts of chimeric receptors composed of the extracellular domain of the human platelet-derived growth factor (PDGF)beta receptor and the transmembrane and intracellular domains of the fibroblast growth factor receptors (FGFRs) 1, 3, and 4 undergo ligand-induced differentiation. The FGFR1 chimera (PFR1)(More)