Influence of RP4 plasmid on extracellular protease secretion by Proteus mirabilis.

The transference by conjugation of protease genetic information between Proteus mirabilis strains only occurs upon mobilization by a conjugative plasmid such as RP4 (Inc P group). Upon receiving the RP4 plasmid, the level of proteolytic activity of the protease-excreting P. mirabilis is reduced to about 50%.

Analysis of Blastocladiella emersonii ribosomal proteins in four two-dimensional gel electrophoresis systems.

Ribosomal proteins of the aquatic fungus Blastocladiella emersonii were isolated and characterized on four different two-dimensional polyacrylamide gel electrophoresis systems. 40S and 60S ribosomal subunit proteins from zoospores were identified. The position of every protein was determined in each electrophoretic system using the "four-corners" method (Madjar et al.

Phosphorylation of ribosomal protein S6 in the aquatic fungus Blastocladiella emersonii.

The changes in the degree of phosphorylation of ribosomal protein S6 during the life cycle of the aquatic fungus Blastocladiella emersonii were analyzed by two-dimensional gel electrophoresis. Three phosphorylated derivatives of S6 are present throughout the entire life cycle. However, under certain germination conditions, more highly phosphorylated derivatives of S6 appear.

Cyclic nucleotide-independent protein kinases from ribosomes and phosphorylation of a single 40S ribosomal subunit protein in zoospores of Blastocladiella emersonii.

Cyclic nucleotide-independent protein kinase (EC 2.7.1.