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Open AccessArticle

Detection of ALDH3B2 in Human Placenta

Department of Bioanalysis and Drug Analysis, Faculty of Pharmacy, Medical University of Warsaw, 02-097 Warsaw, Poland
Department of Pharmaceutical Microbiology, Centre for Preclinical Research and Technology (CePT), Faculty of Pharmacy, Medical University of Warsaw, 02-097 Warsaw, Poland
Biological and Chemical Research Centre, Faculty of Chemistry, University of Warsaw, 02-097 Warsaw, Poland
Department of Cellular Signaling, Mossakowski Research Centre, Polish Academy of Sciences, Pawińskiego 5, 02-106 Warsaw, Poland
Forensic Medicine Department, First Faculty of Medicine, Medical University of Warsaw, 02-097 Warsaw, Poland
Author to whom correspondence should be addressed.
Int. J. Mol. Sci. 2019, 20(24), 6292;
Received: 7 November 2019 / Revised: 11 December 2019 / Accepted: 11 December 2019 / Published: 13 December 2019
(This article belongs to the Section Molecular Biology)
Aldehyde dehydrogenase 3B2 (ALDH3B2) gene contains a premature termination codon, which can be skipped or suppressed resulting in full-length protein expression. Alternatively, the longest putative open reading frame starting with the second in-frame start codon would encode short isoform. No unequivocal evidence of ALDH3B2 expression in healthy human tissues is available. The aim of this study was to confirm its expression in human placenta characterized by the highest ALDH3B2 mRNA abundance. ALDH3B2 DNA and mRNA were sequenced. The expression was investigated using western blot. The identity of the protein was confirmed using mass spectrometry (MS). The predicted tertiary and quaternary structures, subcellular localization, and phosphorylation sites were assessed using bioinformatic analyses. All DNA and mRNA isolates contained the premature stop codon. In western blot analyses, bands corresponding to the mass of full-length protein were detected. MS analysis led to the identification of two unique peptides, one of which is encoded by the nucleotide sequence located upstream the second start codon. Bioinformatic analyses suggest cytoplasmic localization and several phosphorylation sites. Despite premature stop codon in DNA and mRNA sequences, full-length ALDH3B2 was found. It can be formed as a result of premature stop codon readthrough, complex phenomenon enabling stop codon circumvention. View Full-Text
Keywords: ALDH3B2; premature stop codon; placenta; readthrough ALDH3B2; premature stop codon; placenta; readthrough
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Michorowska, S.; Giebułtowicz, J.; Wolinowska, R.; Konopka, A.; Wilkaniec, A.; Krajewski, P.; Bulska, E.; Wroczyński, P. Detection of ALDH3B2 in Human Placenta. Int. J. Mol. Sci. 2019, 20, 6292.

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