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Examples
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N-termini, Asp or Glu, undergo arginylation at the N-terminus, converting the acidic, negatively charged residue at this site to a positively charged residue.
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Parallel to our work on the RNase effect, Avram and Yuval characterized the enzyme and identified on it three distinct substrate binding sites for: (i) basic (the one involved in recognition of basic and Arg-modified acidic Ntermini) and (ii) bulky-hydrophobic N-termini, but also for (iii) larger, yet still undefined "body" sites that reside downstream to the N-terminal residue.
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This important finding demonstrated that this N-terminally modified "family" of proteins, a group that constitutes a large proportion of cellular proteins, must be targeted by signals that are distinct from the N-terminal residue and reside downstream to it: since they do not have free N-termini, they cannot be recognized by this residue.
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Reiss, the ligase recognizes several groups of substrates, among them proteins with basic but not with acidic N-termini.
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We report 11 additional spidroin N-termini found by sequencing ~1,900 silk gland cDNAs from nine spider species that shared a common ancestor
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Through separate and combined phylogenetic analyses of N-terminal domains and their corresponding C-termini, we find that combined analysis produces the most resolved trees and that N-termini contribute more support and less conflict than the C-termini.
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Receptor surface re-expression at 37°C was monitored over time by FACS analysis using antibodies recognizing the extracellular C-terminus of the transferrin receptor (OKT9), and the extracellular N-termini of CXCR4 (6H8) [24] and CXCR7 (9C4) [5]
PLoS ONE Alerts: New Articles Ulrike Naumann et al. 2010
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Receptor surface re-expression at 37°C was monitored over time by FACS analysis using antibodies recognizing the extracellular C-terminus of the transferrin receptor (OKT9), and the extracellular N-termini of CXCR4 (6H8) [24] and CXCR7 (9C4) [5] and secondary Alexa Fluor 488-F (ab′) 2 goat anti-mouse IgG.
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Receptor surface re-expression at 37°C was monitored over time by FACS analysis using antibodies recognizing the extracellular C-terminus of the transferrin receptor (OKT9), and the extracellular N-termini of CXCR4 (6H8) [24] and CXCR7 (9C4) [5]
PLoS ONE Alerts: New Articles Ulrike Naumann et al. 2010
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N-termini have maintained several features, consistent with this domain playing a key role in silk assembly.
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