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Investigating the secondary metabolism of Brasilonema (Cyanobacteria: Scytonemataceae)

Grant number: 18/01563-2
Support Opportunities:Scholarships abroad - Research Internship - Post-doctor
Effective date (Start): July 01, 2018
Effective date (End): June 30, 2019
Field of knowledge:Agronomical Sciences - Agronomy
Principal Investigator:Alessandro de Mello Varani
Grantee:Danillo Oliveira de Alvarenga
Supervisor: Anna Kaarina Sivonen
Host Institution: Faculdade de Ciências Agrárias e Veterinárias (FCAV). Universidade Estadual Paulista (UNESP). Campus de Jaboticabal. Jaboticabal , SP, Brazil
Research place: University of Helsinki, Finland  
Associated to the scholarship:15/14600-5 - Comparative genomics of Brasilonema (cyanobacteria, Scytonemataceae) isolates to identify genes related to leaf infection in eucalyptus grandis, BP.PD


Brasilonema is a cyanobacterial genus in which the only known oxyphotobacteria known to infect plants are classified. The study of genomes from micro-organisms of this genus may bring several contributions, including a better understanding of the diversity of cyanobacterial secondary metabolism and the possible role of their bioactive molecules. Previously, as part of the project "Comparative genomics of Brasilonema (Cyanobacteria, Scytonemataceae) strains for the identification of genes related to Eucalyptus grandis leaf infection" (FAPESP #2015/146005), a considerable number of gene clusters predicted as involved in secondary metabolism have been identified in the genomes from two Brasilonema spp. strains. The aim of this research proposal is to analyze the secondary metabolites produced by strains B. octagenarum UFV-E1 and B. sennae CENA114 and to identify putative gene clusters encoding enzymes involved in their biosynthesis. For this purpose, cells from UFVE1 and CENA114 cultures will be grown in liquid BG-110 medium for three weeks and used for the production of raw extracts, which will have their capacity of inhibiting microbial pathogen strains tested. Positive extracts will be fractioned and subjected to liquid chromatography/mass spectrometry analyses for structural identification. The characterized molecules will then be correlated to predicted clusters containing genes for their putative biosynthetic enzymes. It is expected that novel molecules and/or new variants of known molecules produced by Brasilonema strains are found and successfully assigned to their putative biosynthetic pathways.

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Scientific publications (6)
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
VILAS BOAS, LAYNE AMARAL; XAVIER SENRA, MARCUS VINICIUS; FERNANDES, KELLY; DA ANUNCIACAO GOMES, ANDREIA MARIA; PEDROSO DIAS, ROBERTO JUNIO; PINTO, ERNANI; FONSECA, ANA LUCIA. In vitro toxicity of isolated strains and cyanobacterial bloom biomasses over Paramecium caudatum (ciliophora): Lessons from a non-metazoan model organism. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY, v. 202, . (14/50420-9, 18/01563-2)
AHMED, MUHAMMAD N.; WAHLSTEN, MATTI; JOKELA, JOUNI; NEES, MATTHIAS; STENMAN, ULF-HAKAN; ALVARENGA, DANILLO O.; STRANDIN, TOMAS; SIVONEN, KAARINA; POSO, ANTTI; PERMI, PERTTU; et al. Potent Inhibitor of Human Trypsins from the Aeruginosin Family of Natural Products. ACS Chemical Biology, v. 16, n. 11, p. 10-pg., . (18/01563-2)
GERALDES, VANESSA; DE MEDEIROS, LIVIA SOMAN; LIMA, STELLA T.; ALVARENGA, DANILLO OLIVEIRA; GACESA, RANKO; LONG, PAUL F.; FIORE, MARLI FATIMA; PINTO, ERNANI. Genetic and biochemical evidence for redundant pathways leading to mycosporine-like amino acid biosynthesis in the cyanobacterium Sphaerospermopsis torques-reginae ITEP-024. ALGAE, v. 35, n. 2, p. 177-187, . (14/50420-9, 15/22742-4, 18/01563-2)
SHISHIDO, TANIA KEIKO; JOKELA, JOUNI; HUMISTO, ANU; SUURNAKKI, SUVI; WAHLSTEN, MATTI; ALVARENGA, DANILLO O.; SIVONEN, KAARINA; FEWER, DAVID P.. The Biosynthesis of Rare Homo-Amino Acid Containing Variants of Microcystin by a Benthic Cyanobacterium. MARINE DRUGS, v. 17, n. 5, . (18/01563-2)
ALVARENGA, DANILLO O.; FRANCO, MAIONE W.; SIVONEN, KAARINA; FIORE, MARLI F.; VARANI, ALESSANDRO M.. Evaluating Eucalyptus leaf colonization by Brasilonema octagenarum (Cyanobacteria, Scytonemataceae) using in planta experiments and genomics. PeerJ, v. 8, . (13/50425-8, 15/14600-5, 18/01563-2)
POPIN, RAFAEL VICENTINI; ALVARENGA, DANILLO OLIVEIRA; CASTELO-BRANCO, RAQUEL; FEWER, DAVID PETER; SIVONEN, KAARINA. Mining of Cyanobacterial Genomes Indicates Natural Product Biosynthetic Gene Clusters Located in Conjugative Plasmids. FRONTIERS IN MICROBIOLOGY, v. 12, . (18/01563-2)

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