title: CvL, a lectin from the marine sponge Cliona varians: Isolation, characterization and its effects on pathogenic bacteria and Leishmania promastigotes.
abstract: CvL, a lectin from the marine sponge Cliona varians was purified by acetone fractionation followed by Sepharose CL 4B affinity chromatography. CvL agglutinated papainized treated human erythrocytes with preference for type A erythrocytes. The lectin was strongly inhibited by monosaccharide d-galactose and disaccharide sucrose. CvL is a tetrameric glycoprotein of 28 kDa subunits linked by disulphide bridges with a molecular mass of 106 kDa by SDS-PAGE and 114 kDa by Sephacryl S300 gel filtration. The lectin was Ca2+ dependent, stable up to 60 degrees C for 60 min, with optimum pH of 7.5. CvL displays a cytotoxic effect on gram positive bacteria, such as Bacillus subtilis and Staphylococcus aureus. However, CvL did not affect gram negative bacteria, such as Escherichia coli and Pseudomonas aeruginosa. Leishmania chagasi promastigotes were agglutinated by CvL up to 2(8) titer. These findings are indicative of the physiological defense roles of CvL and its possible use in the antibiosis of bacteria and protozoa pathogenic.
authors.affiliation: Departamento de Biofísica e Farmacologia, Centro de Biociências, Universidade Federal do Rio Grande do Norte, Natal, RN, Brazil.
authors.forename: Raniere M
authors.initials: RM
authors.lastname: Moura
authors.forename: Alexandre F S
authors.initials: AF
authors.lastname: Queiroz
authors.forename: Jacy M S L L
authors.initials: JM
authors.lastname: Fook
authors.forename: Anny S F
authors.initials: AS
authors.lastname: Dias
authors.forename: Norberto K V
authors.initials: NK
authors.lastname: Monteiro
authors.forename: Jannisson K C
authors.initials: JK
authors.lastname: Ribeiro
authors.forename: Gioconda E D D
authors.initials: GE
authors.lastname: Moura
authors.forename: Leonardo L P
authors.initials: LL
authors.lastname: Macedo
authors.forename: Elizeu A
authors.initials: EA
authors.lastname: Santos
authors.forename: Maurício P
authors.initials: MP
authors.lastname: Sales
mesh_terms: D000818:Animals; D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D000981:Antiprotozoal Agents / Q000494:pharmacology*; D001412:Bacillus subtilis / Q000187:drug effects; D004926:Escherichia coli / Q000187:drug effects; D006386:Hemagglutination Tests; D006801:Humans; D037102:Lectins / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology*; D018314:Leishmania infantum / Q000187:drug effects; D011161:Porifera / Q000737:chemistry*; D011550:Pseudomonas aeruginosa / Q000187:drug effects; D013211:Staphylococcus aureus / Q000187:drug effects
chemical_list: D000900:Anti-Bacterial Agents; D000981:Antiprotozoal Agents; D037102:Lectins