Impact of C‐terminal amino acid composition on protein expression in bacteria

Abstract: The C‐terminal sequence of a protein is involved in processes such as efficiency of translation termination and protein degradation. However, the general relationship between features of this C‐terminal sequence and levels of protein expression remains unknown. Here, we identified C‐terminal amino acid biases that are ubiquitous across the bacterial taxonomy (1,582 genomes). We showed that the frequency is higher for positively charged amino acids (lysine, arginine), while hydrophobic amino acids and threonine are lower. We then studied the impact of C‐terminal composition on protein levels in a library of Mycoplasma pneumoniae mutants, covering all possible combinations of the two last codons. We found that charged and polar residues, in particular lysine, led to higher expression, while hydrophobic and aromatic residues led to lower expression, with a difference in protein levels up to fourfold. We further showed that modulation of protein degradation rate could be one of the main mechanisms driving these differences. Our results demonstrate that the identity of the last amino acids has a strong influence on protein expression levels.

Location
Deutsche Nationalbibliothek Frankfurt am Main
Extent
Online-Ressource
Language
Englisch

Bibliographic citation
Impact of C‐terminal amino acid composition on protein expression in bacteria ; volume:16 ; number:5 ; year:2020 ; extent:19
Molecular systems biology ; 16, Heft 5 (2020) (gesamt 19)

Creator
Weber, Marc
Burgos, Raul
Yus, Eva
Yang, Jae‐Seong
Lluch‐Senar, Maria
Serrano, Luis

DOI
10.15252/msb.20199208
URN
urn:nbn:de:101:1-2022062408085739990448
Rights
Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.
Last update
15.08.2025, 7:22 AM CEST

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Associated

  • Weber, Marc
  • Burgos, Raul
  • Yus, Eva
  • Yang, Jae‐Seong
  • Lluch‐Senar, Maria
  • Serrano, Luis

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