The steady-state level of Mg-protoporphyrin IX is not a determinant of plastid-to-nucleus signaling in Arabidopsis.

ABSTRACT: The plastid plays a vital role in various cellular activities within plant cells including photosynthesis and other metabolic pathways. It is believed that the functional status of the plastid is somehow monitored by the nucleus to optimize the expression of genes encoding plastid proteins. The currently dominant model for plastid-derived signaling ("plastid signaling") proposes that Mg-protoporphyrin IX (MgProto) is a negative signal that represses the expression of a wide range of nuclear genes encoding plastid-localized proteins when plastid development is inhibited. In this study, we have re-evaluated this hypothesis by quantifying the steady-state levels of MgProto (as well as its neighboring intermediates protoporphyrin IX and Mg-Proto monomethyl ester [MgProtoMe]) in Arabidopsis pla

SUBMITTER: Mochizuki N 

PROVIDER: S-EPMC2567512 | biostudies-literature | 2008 Sep

REPOSITORIES: biostudies-literature