Lutzomyia longipalpis: pH in the gut, digestive glycosidases, and some speculations upon Leishmania development.
Screening for digestive glycosidases in different parts of the gut and associated organs of Lutzomyia longipalpis is reported. Searches for the enzymes were made in blood-fed and non-blood-fed females and the enzymes were characterized as soluble or membrane-bound molecules. A total of four different activities were detected, corresponding to the following specificities: an alpha-glucosidase, an N-acetyl-beta-d-glucosaminidase, an N-acetyl-beta-d-galactosaminidase, and an alpha-l-fucosidase. Their possible role and importance for Leishmania development are discussed and the alpha-glucosidase enzyme was partially characterized. The pH inside the gut of non-blood-fed phlebotomines was measured with pH indicator dyes. The pH ranges obtained for crop, midgut, and hindgut were, respectively, higher than pH 6, pH 6, and lower than pH 6. A hypothesis concerning these data and Leishmania development is proposed.
Gontijo
N F
NF
Departamento de Parasitologia, Departamento de Bioquímica e Imunologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais-UFMG, Caixa Postal 486, Minas Gerais, Belo Horizonte, CEP 31 270-901, Brazil. nelder@icb.ufmg.br
Almeida-Silva
S
S
Costa
F F
FF
Mares-Guia
M L
ML
Williams
P
P
Melo
M N
MN
D000818:Animals; D050260:Carbohydrate Metabolism; D004063:Digestion; D005260:Female; D006026:Glycoside Hydrolases / Q000032:analysis* / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D007303:Insect Vectors / Q000737:chemistry / Q000201:enzymology* / Q000469:parasitology; D007891:Leishmania / Q000254:growth & development*; D009596:Nitrophenols / Q000737:chemistry; D011576:Psychodidae / Q000737:chemistry / Q000201:enzymology* / Q000469:parasitology; D012995:Solubility; D013379:Substrate Specificity
D009596:Nitrophenols; D006026:Glycoside Hydrolases; C024836:4-nitrophenol