A SecY homologue is required for the elaboration of the chloroplast thylakoid membrane and for normal chloroplast gene expression.

ABSTRACT: Results of in vitro and genetic studies have provided evidence for four pathways by which proteins are targeted to the chloroplast thylakoid membrane. Although these pathways are initially engaged by distinct substrates and involve some distinct components, an unresolved issue has been whether multiple pathways converge on a common translocation pore in the membrane. A homologue of eubacterial SecY called cpSecY is localized to the thylakoid membrane. Since SecY is a component of a protein-translocating pore in bacteria, cpSecY likely plays an analogous role. To explore the role of cpSecY, we obtained maize mutants with transposon insertions in the corresponding gene. Null cpSecY mutants exhibit a severe loss of thylakoid membrane, differing in this regard from mutants lacking cpSecA. Ther

SUBMITTER: Roy LM 

PROVIDER: S-EPMC2148445 | biostudies-literature | 1998 Apr

REPOSITORIES: biostudies-literature