Effects of prodigiosin family compounds from Pseudoalteromonas sp. 1020R on the activities of protein phosphatases and protein kinases.
Pseudoalteromonas sp. strain 1020R produces prodigiosin and its closely related congeners, which differ in the length of their alkyl side chains. These red-pigmented compounds were found to exhibit cytotoxicity against human leukemia cell lines. The compounds also showed dose-dependent inhibitory effects on protein phosphatase 2A and protein tyrosine phosphatase 1B (PTP1B), while remaining relatively inactive against protein kinases, including protein tyrosine kinase, Ca(2+)/calmodulin-dependent protein kinase and protein kinases A and C. Comparative studies of the individual pigmented compounds on PTP1B inhibition showed that as the chain length of the alkyl group at the C-3 position of the compound increased, the inhibitory effect on PTP1B decreased. These results suggest that protein phosphatases but not protein kinases might be involved in the cytotoxicity of the prodigiosin family of compounds against malignant cells.
Department of Environmental Systems Engineering, Kochi University of Technology , Kochi , Japan.
Azamjon B
AB
Soliev
Kakushi
K
Hosokawa
Keiichi
K
Enomoto
D045744:Cell Line, Tumor; D004791:Enzyme Inhibitors / Q000302:isolation & purification / Q000494:pharmacology*; D006801:Humans; D010749:Phosphoprotein Phosphatases / Q000037:antagonists & inhibitors*; D011353:Prodigiosin / Q000302:isolation & purification / Q000494:pharmacology*; D011494:Protein Kinases / Q000187:drug effects*; D031161:Pseudoalteromonas / Q000737:chemistry*
D004791:Enzyme Inhibitors; D011494:Protein Kinases; D010749:Phosphoprotein Phosphatases; D011353:Prodigiosin
Cytotoxicity; enzyme inhibition; structure–activity relationship