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Title: Arabidopsis ribosomal proteins control vacuole trafficking and developmental programs through the regulation of lipid metabolism

Journal Article · · Proceedings of the National Academy of Sciences of the United States of America
 [1];  [1];  [1];  [1]
  1. Univ. of California, Riverside, CA (United States). Dept. of Botany and Plant Sciences. Center for Plant Cell Biology. Inst. for Integrative Genome Biology

The vacuole is the most prominent compartment in plant cells and is important for ion and protein storage. In our effort to search for key regulators in the plant vacuole sorting pathway, ribosomal large subunit 4 (rpl4d) was identified as a translational mutant defective in both vacuole trafficking and normal development. Polysome profiling of the rpl4d mutant showed reduction in polysome-bound mRNA compared with wild-type, but no significant change in the general mRNA distribution pattern. Ribsomal profiling data indicated that genes in the lipid metabolism pathways were translationally down-regulated in the rpl4d mutant. Live imaging studies by Nile red staining suggested that both polar and nonpolar lipid accumulation was reduced in meristem tissues of rpl4d mutants. Pharmacological evidence showed that sterol and sphingolipid biosynthetic inhibitors can phenocopy the defects of the rpl4d mutant, including an altered vacuole trafficking pattern. Genetic evidence from lipid biosynthetic mutants indicates that alteration in the metabolism of either sterol or sphingolipid biosynthesis resulted in vacuole trafficking defects, similar to the rpl4d mutant. Tissue-specific complementation with key enzymes from lipid biosynthesis pathways can partially rescue both vacuole trafficking and auxin-related developmental defects in the rpl4d mutant. These results indicate that lipid metabolism modulates auxin-mediated tissue differentiation and endomembrane trafficking pathways downstream of ribosomal protein function.

Research Organization:
Univ. of California, Riverside, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); National Inst. of Health (NIH) (United States); Kansas Technology Enterprise Corporation (United States); Kansas State Univ. (United States)
Grant/Contract Number:
FG02-02ER15295; EPS 0236913; MCB 0455318; DBI 0521587; P20RR16475
OSTI ID:
1348363
Journal Information:
Proceedings of the National Academy of Sciences of the United States of America, Vol. 112, Issue 1; ISSN 0027-8424
Publisher:
National Academy of Sciences, Washington, DC (United States)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 28 works
Citation information provided by
Web of Science

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