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Yeast Elongator protein Elp1p does not undergo proteolytic processing in exponentially growing cells

In eukaryotic organisms, Elongator is a six‐subunit protein complex required for the formation of 5‐carbamoylmethyl (ncm(5)) and 5‐methylcarboxymethyl (mcm(5)) side chains on uridines present at the wobble position (U(34)) of tRNA. The open reading frame encoding the largest Elongator subunit Elp1p...

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Autores principales: Xu, Hao, Bygdell, Joakim, Wingsle, Gunnar, Byström, Anders S.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2015
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4694139/
https://www.ncbi.nlm.nih.gov/pubmed/26407534
http://dx.doi.org/10.1002/mbo3.285
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author Xu, Hao
Bygdell, Joakim
Wingsle, Gunnar
Byström, Anders S.
author_facet Xu, Hao
Bygdell, Joakim
Wingsle, Gunnar
Byström, Anders S.
author_sort Xu, Hao
collection PubMed
description In eukaryotic organisms, Elongator is a six‐subunit protein complex required for the formation of 5‐carbamoylmethyl (ncm(5)) and 5‐methylcarboxymethyl (mcm(5)) side chains on uridines present at the wobble position (U(34)) of tRNA. The open reading frame encoding the largest Elongator subunit Elp1p has two in‐frame 5′ AUG methionine codons separated by 48 nucleotides. Here, we show that the second AUG acts as the start codon of translation. Furthermore, Elp1p was previously shown to exist in two major forms of which one was generated by proteolysis of full‐length Elp1p and this proteolytic cleavage was suggested to regulate Elongator complex activity. In this study, we found that the vacuolar protease Prb1p was responsible for the cleavage of Elp1p. The cleavage occurs between residues 203 (Lys) and 204 (Ala) as shown by amine reactive Tandem Mass Tag followed by LC‐MS/MS (liquid chromatography mass spectrometry) analysis. However, using a modified protein extraction procedure, including trichloroacetic acid, only full‐length Elp1p was observed, showing that truncation of Elp1p is an artifact occurring during protein extraction. Consequently, our results indicate that N‐terminal truncation of Elp1p is not likely to regulate Elongator complex activity.
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spelling pubmed-46941392016-01-06 Yeast Elongator protein Elp1p does not undergo proteolytic processing in exponentially growing cells Xu, Hao Bygdell, Joakim Wingsle, Gunnar Byström, Anders S. Microbiologyopen Original Research In eukaryotic organisms, Elongator is a six‐subunit protein complex required for the formation of 5‐carbamoylmethyl (ncm(5)) and 5‐methylcarboxymethyl (mcm(5)) side chains on uridines present at the wobble position (U(34)) of tRNA. The open reading frame encoding the largest Elongator subunit Elp1p has two in‐frame 5′ AUG methionine codons separated by 48 nucleotides. Here, we show that the second AUG acts as the start codon of translation. Furthermore, Elp1p was previously shown to exist in two major forms of which one was generated by proteolysis of full‐length Elp1p and this proteolytic cleavage was suggested to regulate Elongator complex activity. In this study, we found that the vacuolar protease Prb1p was responsible for the cleavage of Elp1p. The cleavage occurs between residues 203 (Lys) and 204 (Ala) as shown by amine reactive Tandem Mass Tag followed by LC‐MS/MS (liquid chromatography mass spectrometry) analysis. However, using a modified protein extraction procedure, including trichloroacetic acid, only full‐length Elp1p was observed, showing that truncation of Elp1p is an artifact occurring during protein extraction. Consequently, our results indicate that N‐terminal truncation of Elp1p is not likely to regulate Elongator complex activity. John Wiley and Sons Inc. 2015-09-25 /pmc/articles/PMC4694139/ /pubmed/26407534 http://dx.doi.org/10.1002/mbo3.285 Text en © 2015 The Authors. MicrobiologyOpen published by John Wiley & Sons Ltd This is an open access article under the terms of the Creative Commons Attribution (http://creativecommons.org/licenses/by/4.0/) License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
spellingShingle Original Research
Xu, Hao
Bygdell, Joakim
Wingsle, Gunnar
Byström, Anders S.
Yeast Elongator protein Elp1p does not undergo proteolytic processing in exponentially growing cells
title Yeast Elongator protein Elp1p does not undergo proteolytic processing in exponentially growing cells
title_full Yeast Elongator protein Elp1p does not undergo proteolytic processing in exponentially growing cells
title_fullStr Yeast Elongator protein Elp1p does not undergo proteolytic processing in exponentially growing cells
title_full_unstemmed Yeast Elongator protein Elp1p does not undergo proteolytic processing in exponentially growing cells
title_short Yeast Elongator protein Elp1p does not undergo proteolytic processing in exponentially growing cells
title_sort yeast elongator protein elp1p does not undergo proteolytic processing in exponentially growing cells
topic Original Research
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4694139/
https://www.ncbi.nlm.nih.gov/pubmed/26407534
http://dx.doi.org/10.1002/mbo3.285
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