The abstract is read at the publisher; the summary is JClub's.
N8-propargyl spermidine does not support DHS-dependent hypusination of eIF5A in a reconstituted enzymatic assay and shows non-productive binding to DHS.
- Why it matters: Claims of expanded DHS substrate specificity and DHS-dependent acetylhypusination of RIPK1 rely on click-probe labeling that may reflect probe artifacts rather than true enzymatic hypusination.
- What they did: Cells treated with N8-propargyl spermidine showed labeling unaffected by DHS inhibition but strongly reduced by post-lysis cysteine alkylation before click; peptide analysis localized adducts to cysteines, and reconstituted DHS assays tested eIF5A and RIPK1.
- The result: The probe produced cysteine-linked adducts consistent with copper-dependent azide-alkyne-thiol coupling, detected no lysine modifications for propargylated hypusine/deoxyhypusine, failed to modify eIF5A, and did not detect RIPK1 modification.
The findingWhy it mattersWhat they didThe result
AI summary of the abstract · may contain errors · not medical advice · read the paper.