A comparative study of the Se/S substitution in methionine and cysteine in Se-enriched yeast using an inductively coupled plasma mass spectrometry (ICP MS)-assisted proteomics approach.

Abstract:

UNLABELLED:A proteomics approach based on 2D gel electrophoresis followed by HPLC-electrospray Orbitrap MS/MS was developed to investigate the replacement and the degree of the Se/S substitution in methionine and cysteine in Se-rich yeast. Capillary HPLC-inductively coupled plasma mass spectrometry (ICP-MS), employed in parallel to capHPLC-ESI MS, indicated the virtual independence of the ESI MS response of the peptide structure (in the elution range of 30-65% methanol), and hence, the use of ESI MS data to determine the SeCys/Cys and SeMet/Met substitution ratios. For the first time a considerable incorporation of selenocysteine (SeCys) in proteins of the yeast proteome despite the absence of the UGA codon was demonstrated. The SeMet/Met and SeCys/Cys ratios were determined in a large number of peptides (57 and 26, respectively) issued from the tryptic digestion of 19 Se-containing proteins located in the gel by laser ablation-ICP MS imaging. The average Se/S substitution in methionine was 42.9±35.0 and was protein dependent with ratios ranging from 5 to 160 for individual peptides. The substitution of sulphur in cysteine (14.1±4.8%) in the cysteine-containing peptides was relatively similar (ratios from 9 to 23). Taking into account that the cysteine/methionine average ratio (2:1) in the yeast protein fraction, the study allowed the conclusion that 10-15% of selenium present in Se-enriched yeast is in the form of selenocysteine making up the mass balance of selenium species. BIOLOGICAL SIGNIFICANCE:For the first time a considerable incorporation of selenocysteine (SeCys) in proteins of the yeast proteome despite the absence of the UGA codon was demonstrated. It was achieved using a proteomics approach based on 2D gel electrophoresis followed by HPLC-electrospray Orbitrap MS/MS in order to investigate the replacement and the degree of the Se/S substitution in methionine and cysteine in Se-rich yeast.

journal_name

J Proteomics

journal_title

Journal of proteomics

authors

Bierla K,Bianga J,Ouerdane L,Szpunar J,Yiannikouris A,Lobinski R

doi

10.1016/j.jprot.2013.05.010

subject

Has Abstract

pub_date

2013-07-11 00:00:00

pages

26-39

eissn

1874-3919

issn

1876-7737

pii

S1874-3919(13)00251-0

journal_volume

87

pub_type

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