Post-translational maturation of IDA, a peptide signal controlling floral organ abscission in Arabidopsis.

Publikations-Art

Zeitschriftenbeitrag (peer-reviewed)

Autoren

Stührwohldt, N., Hohl, M., Schardon, K., Stintzi, A., Schaller, A.

Erscheinungsjahr

2018

Veröffentlicht in

Commun. Integr. Biol.

DOI

10.1080/19420889.2017.1395119

Seite (von - bis)

e1395119

The abscission of sepals, petals and stamens in Arabidopsis flowers is controlled by a peptide signal called IDA (Inflorescence Deficient in Abscission). IDA belongs to the large group of small post-translationally modified signaling peptides that are synthesized as larger precursors and require proteolytic processing and specific side chain modifications for signal biogenesis. Using tissue-specific expression of proteinase inhibitors as a novel approach for loss-of-function analysis, we recently identified the peptidases responsible for IDA maturation within the large family of subtilisin-like proteinases (subtilases; SBTs). Further biochemical and physiological assays identified three SBTs (AtSBT5.2, AtSBT4.12, AtSBT4.13) that cleave the IDA precursor to generate the N-terminus of the mature peptide. The C-terminal processing enzyme(s) remain(s) to be identified. While proline hydroxylation was suggested as additional post-translational modification required for IDA maturation, hydroxylated and non-hydroxylated IDA peptides were found to be equally active in bioassays for abscission.