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An unusual type I ribosome-inactivating protein from Agrostemma githago L.

Abstract：

:Agrostemma githago L. (corn cockle) is an herbaceous plant mainly growing in Europe. The seeds of the corn cockle are toxic and poisonings were widespread in the past by consuming contaminated flour. The toxic principle of Agrostemma seeds was attributed to triterpenoid secondary metabolites. Indeed, this is in part true. However Agrostemma githago L. is also a producer of ribosome-inactivating proteins (RIPs). RIPs are N-glycosylases that inactivate the ribosomal RNA, a process leading to an irreversible inhibition of protein synthesis and subsequent cell death. A widely known RIP is ricin from Ricinus communis L., which was used as a bioweapon in the past. In this study we isolated agrostin, a 27 kDa RIP from the seeds of Agrostemma githago L., and determined its full sequence. The toxicity of native agrostin was investigated by impedance-based live cell imaging. By RNAseq we identified 7 additional RIPs (agrostins) in the transcriptome of the corn cockle. Agrostin was recombinantly expressed in E. coli and characterized by MALDI-TOF-MS and adenine releasing assay. This study provides for the first time a comprehensive analysis of ribosome-inactivating proteins in the corn cockle and complements the current knowledge about the toxic principles of the plant.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Weise C,Schrot A,Wuerger LTD,Adolf J,Gilabert-Oriol R,Sama S,Melzig MF,Weng A

doi

10.1038/s41598-020-72282-2

subject

Has Abstract

pub_date

2020-09-21 00:00:00

pages

15377

issue

1

issn

2045-2322

pii

10.1038/s41598-020-72282-2

journal_volume

10

pub_type

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