Biochemical and genetic analysis of a unique poly(ADP-ribosyl) glycohydrolase (PARG) of the pathogenic fungus Fusarium oxysporum f. sp. lycopersici.

The genome sequence of the plant pathogen Fusarium oxysporum f. sp. lycopersici contains a single gene encoding a predicted poly(ADP-ribose) glycohydrolase (FOXG_05947.

Phylogenetic analysis of fungal heterotrimeric G protein-encoding genes and their expression during dimorphism in Mucor circinelloides.

In fungi, heterotrimeric G proteins are key regulators of biological processes such as mating, virulence, morphology, among others. Mucor circinelloides is a model organism for many biological processes, and its genome contains the largest known repertoire of genes that encode putative heterotrimeric G protein subunits in the fungal kingdom: twelve Gα (McGpa1-12), three Gβ (McGpb1-3), and three Gγ (McGpg1-3). Phylogenetic analysis of fungal Gα showed that they are divided into four distinct groups as reported previously.

Rho-kinase in sea urchin eggs and embryos.

The activation of sea urchin eggs at fertilization provides an ideal system for studying the molecular events involved in cellular activation. Rho GTPases, which are key signaling enzymes in eukaryotes, are involved in sustaining the activation of sea urchin eggs; however, their downstream effectors have not yet been characterized. In somatic cells, RhoA regulates a serine/threonine kinase known as Rho-kinase (ROCK).

Concordance and interaction of guanine nucleotide dissociation inhibitor (RhoGDI) with RhoA in oogenesis and early development of the sea urchin.

Rho GTPases are Ras-related GTPases that regulate a variety of cellular processes. In the sea urchin Strongylocentrotus purpuratus, RhoA in the oocyte associates with the membrane of the cortical granules and directs their movement from the cytoplasm to the cell cortex during maturation to an egg. RhoA also plays an important role regulating the Na(+) -H(+) exchanger activity, which determines the internal pH of the cell during the first minutes of embryogenesis.

Rho1 and other GTP-binding proteins are associated with vesicles carrying glucose oxidase activity from Fusarium oxysporum f. sp. lycopersici.

In eucaryotic cells, the delivery of a secreted protein to the plasma membrane via vesicles must include transport, recognition, and fusion events. Proteins exposed on the cytoplasmic face of the secretory vesicles play a role in these events; these include the GTP-binding proteins, which are crucial components in this process. Fractions enriched with vesicles carrying glucose oxidase (GOX) activity from Fusarium oxysporum f.