Plant Nucleotide Cyclases

Cyclic Nucleotide Monophosphates and Their Cyclases in Plant Signaling

The cyclic nucleotide monophosphates (cNMPs), and notably 3',5'-cyclic guanosine monophosphate (cGMP) and 3',5'-cyclic adenosine monophosphate (cAMP) are now accepted as key signaling molecules in many processes in plants including growth and differentiation, photosynthesis, and biotic and abiotic defense. At the single molecule level, we are now beginning to understand how cNMPs modify specifi...

Cyclic Nucleotides and Nucleotide Cyclases in Plant Stress Responses

The cyclic nucleotides monophosphates (cNMP) and in particular adenosine 3’,5’-cyclic monophosphate (cAMP) and guanosine 3’,5’-cyclic monophosphate (cGMP) are cyclic catalytic products of adenosine 5'-triphosphate (ATP) and guanosine 5’-triphosphate (GTP) respectively. These cNMPs are universal second messengers with key roles in many and diverse physiological responses and processes in prokary...

Pro-nucleotide inhibitors of adenylyl cyclases in intact cells.

9-substituted adenine derivatives with protected phosphoryl groups were synthesized and tested as inhibitors of adenylyl cyclase in isolated enzyme and intact cell systems. Protected 3'-phosphoryl derivatives of 2',5'-dideoxyadenosine (2',5'-dd-Ado) and beta-l-2',5'-dd-Ado, protected 5'-phosphoryl derivatives of beta-l-2',3'-dd-Ado, and protected phosphoryl derivatives of two 9-(2-phosphonometh...

Hypoxia inhibits cyclic nucleotide-stimulated epithelial ion transport: role for nucleotide cyclases as oxygen sensors.

Decreased oxygen delivery to cells (hypoxia) is prevalent in a number of important diseases. Little is known about mechanisms of oxygen sensing at the cellular level or about whether functional correlates of oxygen sensing exist. In this study, we examined the impact of hypoxia on stimulated epithelial ion transport function. T84 cells, a model of intestinal epithelia, were grown on permeable s...

The ascent of nucleotide cyclases: conservation and evolution of a theme