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Perrar, Andreas; Dissmeyer, Nico; Huesgen, Pitter F
Journal of experimental botany, 04/2019, Letnik: 70, Številka: 7Journal Article
We review methods enabling proteome-wide characterization of protein termini, which have already provided new insights into proteolytic processes, alternative translation, and N-terminal modifications and determinants of protein stability in plants. Abstract Dynamic regulation of protein function and abundance plays an important role in virtually every aspect of plant life. Diversifying mechanisms at the RNA and protein level result in many protein molecules with distinct sequence and modification, termed proteoforms, arising from a single gene. Distinct protein termini define proteoforms arising from translation of alternative transcripts, use of alternative translation initiation sites, and different co- and post-translational modifications of the protein termini. Also site-specific proteolytic processing by endo- and exoproteases generates truncated proteoforms, defined by distinct protease-generated neo-N- and neo-C-termini, that may exhibit altered activity, function, and localization compared with their precursor proteins. In eukaryotes, the N-degron pathway targets cytosolic proteins, exposing destabilizing N-terminal amino acids and/or destabilizing N-terminal modifications for proteasomal degradation. This enables rapid and selective removal not only of unfolded proteins, but also of substrate proteoforms generated by proteolytic processing or changes in N-terminal modifications. Here we summarize current protocols enabling proteome-wide analysis of protein termini, which have provided important new insights into N-terminal modifications and protein stability determinants, protein maturation pathways, and protease–substrate relationships in plants.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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