A subtilisin-like serine protease involved in the regulation of stomatal density and distribution of Arabidopsis thaliana

Article Abstract:

A subtilisin-like serine protease related to regulation of density of stomata, which control plant gas exchange with the atmosphere, and distribution of Arabidopsis thaliana is discussed. A. thaliana mutants with altered stomatal characteristics have been isolated and studied. SDD1 is proposed to act as a processing protease involved in the mediation of a signal controlling development of cell lineages that precede guard cell formation. The sdd1-1 mutant has a 2- to 4-fold increase of in stomata density and formation of clustered stomata, but the internal leaf architecture is not changed.

Germany, Proteases, Genetic regulation, Cytochemistry, Plant molecular genetics, Stomata

---

Identification of an SCF ubiquitin-ligase complex required for auxin response in Arabidposis thaliana

Article Abstract:

An SCF ubiquitin-ligase complex required for auxin, that is indole-3-acetic acid (IAA), response in Arabidposis thaliana has been identtified. Auxin is a plant hormone that regulates various aspects of plant growth/development and mutations in AK1 (ital) or TIRI1 (ital) bring a decrease in auxin response. Overexpression of TIR1 enhances auxin response, which might indicate that SCF (super.TIR1) is a limiting factor. New support exists for a model in which auxin activity is dependent on the regulated proteolysis of repressor proteins.

United States, Canada, Statistical Data Included, Plant genetics, Cellular signal transduction, Proteolysis, Phytochemistry, Plant biochemistry

---

The TIR1 protein of Arabidopsis functions in auxin response and is related to human SKP2 and yeast Grr1p

Article Abstract:

Key regulatory proteins need to be modified by ubiquitin or a related protein for appropriate auxin response in Arabidopsis. Experiments with Transport Inhibitor Response 1 (TIR1) mutants underlines the role of this gene for auxin-response. The mutants did not have several of the growth responses moderated by auxin. Sequence comparisons suggests links between this gene, the yeast protein Grr1p and the human protein SKP2.

Arabidopsis, Auxins

Similar abstracts:

• Abstracts: Characterization of epitopes involved in the neutralization of Pasteurella haemolytica serotype A1 leukotoxin
• Abstracts: Marker systems for the phenotypic recognition of maternally derived trisomics in maize. Marker systems for B-A translocations in maize
• Abstracts: A common genetic mechanism determines plasma apolipoprotein B levels and dense LDL subfraction distribution in familial combined hyperlipidemia
• Abstracts: EGF receptor signaling stimulates SRC kinase phosphorylation of clathrin, influencing clathrin redistribution and EGF uptake
• Abstracts: FGF signaling inhibits chrondrocyte proliferation and regulates bone development through the STAT-1 pathway. The subcellular localization of PBX1 and EXD proteins depends on nuclear import and export signals and is modulated by association with PREP1 and HTH

This website is not affiliated with document authors or copyright owners. This page is provided for informational purposes only. Unintentional errors are possible.