Mining the cellular inventory of pyridoxal phosphate-dependent enzymes with functionalized cofactor mimics

Annabelle Hoegl, Matthew B. Nodwell, Volker C. Kirsch, Nina C. Bach, Martin Pfanzelt, Matthias Stahl, Sabine Schneider, Stephan A. Sieber

Research output: Contribution to journalArticlepeer-review

39 Scopus citations

Abstract

Pyridoxal phosphate (PLP) is an enzyme cofactor required for the chemical transformation of biological amines in many central cellular processes. PLP-dependent enzymes (PLP-DEs) are ubiquitous and evolutionarily diverse, making their classification based on sequence homology challenging. Here we present a chemical proteomic method for reporting on PLP-DEs using functionalized cofactor probes. We synthesized pyridoxal analogues modified at the 2′-position, which are taken up by cells and metabolized in situ. These pyridoxal analogues are phosphorylated to functional cofactor surrogates by cellular pyridoxal kinases and bind to PLP-DEs via an aldimine bond which can be rendered irreversible by NaBH4 reduction. Conjugation to a reporter tag enables the subsequent identification of PLP-DEs using quantitative, label-free mass spectrometry. Using these probes we accessed a significant portion of the Staphylococcus aureus PLP-DE proteome (73%) and annotate uncharacterized proteins as novel PLP-DEs. We also show that this approach can be used to study structural tolerance within PLP-DE active sites and to screen for off-targets of the PLP-DE inhibitorD-cycloserine.

Original languageEnglish
Pages (from-to)1234-1245
Number of pages12
JournalNature Chemistry
Volume10
Issue number12
DOIs
StatePublished - 2018

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