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• W1520572979 abstract "The 70-kDa neurofilament protein subunit (NF-L) is phosphorylated in vivo on at least three sites (L1 to L3) (Sihag, R. K. and Nixon, R. A. (1989) J. Biol. Chem. 264, 457-464). The turnover of phosphate groups on NF-L during axonal transport was determined after the neurofilaments in retinal ganglion cells were phosphorylated in vivo by injecting mice intravitreally with [32P]orthophosphate. Two-dimensional phosphopeptide maps of NF-L from optic axons of mice 10 to 90 h after injection showed that radiolabel decreased faster from peptides L2 and L3 than from L1 as neurofilaments were transported. To identify phosphorylation sites on peptide L2, axonal cytoskeletons were phosphorylated by protein kinase A in the presence of heparin. After the isolated NF-L subunits were digested with alpha-chymotrypsin, 32P-peptides were separated by high performance liquid chromatography on a reverse-phase C8 column. Two-dimensional peptide mapping showed that the alpha-chymotrypsin 32P-peptide accepting most of the phosphates from protein kinase A migrated identically with the in vivo-labeled phosphopeptide L2. The sequence of this peptide (S-V-R-R-S-Y) analyzed by automated Edman degradation corresponded to amino acid residues 51-56 of the NF-L sequence. A synthetic 13-mer (S-L-S-V-R-R-S-Y-S-S-S-S-G) corresponding to amino acid residues 49-61 of NF-L was also phosphorylated by protein kinase A. alpha-Chymotryptic digestion of the 13-mer generated a peptide which contained most of the phosphates and co-migrated with the phosphopeptide L2 on two-dimensional phosphopeptide maps. Edman degradation of the phosphorylated 13-mer identified serine residue 55 which is located within a consensus phosphorylation sequence for protein kinase A as the major site of phosphorylation. Since protein kinase A-mediated phosphorylation influences intermediate filament assembly/disassembly in vitro, we propose that the phosphopeptide L2 region is a neurofilament-assembly domain and that the cycle of phosphorylation and dephosphorylation of Ser-55 on NF-L, which occurs relatively early after subunit synthesis in vivo, regulaaes a step in neurofilament assembly or initial interactions during axonal transport." @default.
• W1520572979 created "2016-06-24" @default.
• W1520572979 creator A5022090615 @default.
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• W1520572979 date "1991-10-01" @default.
• W1520572979 modified "2023-10-13" @default.
• W1520572979 title "Identification of Ser-55 as a major protein kinase A phosphorylation site on the 70-kDa subunit of neurofilaments. Early turnover during axonal transport." @default.
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• W1520572979 doi "https://doi.org/10.1016/s0021-9258(18)55143-7" @default.
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