Calpain-generated natural protein fragments as short-lived substrates of the N-end rule pathway.

Abstract:

:Calpains are Ca(2+)-dependent intracellular proteases. We show here that calpain-generated natural C-terminal fragments of proteins that include G protein-coupled receptors, transmembrane ion channels, transcriptional regulators, apoptosis controllers, kinases, and phosphatases (Phe-GluN2a, Lys-Ica512, Arg-Ankrd2, Tyr-Grm1, Arg-Atp2b2, Glu-Bak, Arg-Igfbp2, Glu-IκBα, and Arg-c-Fos), are short-lived substrates of the Arg/N-end rule pathway, which targets destabilizing N-terminal residues. We also found that the identity of a fragment's N-terminal residue can change during evolution, but the residue's destabilizing activity is virtually always retained, suggesting selection pressures that favor a short half-life of the calpain-generated fragment. It is also shown that a self-cleavage of a calpain can result in an N-end rule substrate. Thus, the autoprocessing of calpains can control them by making active calpains short-lived. These and related results indicate that the Arg/N-end rule pathway mediates the remodeling of oligomeric complexes by eliminating protein fragments that are produced in these complexes through cleavages by calpains or other nonprocessive proteases. We suggest that this capability of the Arg/N-end rule pathway underlies a multitude of its previously known but mechanistically unclear functions.

authors

Piatkov KI,Oh JH,Liu Y,Varshavsky A

doi

10.1073/pnas.1401639111

subject

Has Abstract

pub_date

2014-03-04 00:00:00

pages

E817-26

issue

9

eissn

0027-8424

issn

1091-6490

pii

1401639111

journal_volume

111

pub_type

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