title: Cloning, characterization, and structural analysis of a C-type lectin from Bothrops insularis (BiL) venom.
abstract: Lectins are carbohydrate-binding molecules that mediate a variety of biological processes. In this work, we identify and characterize a lectin from Bothrops insularis venom, with respect to its biochemical properties and theoretical structure. Initially, from a venom gland cDNA library, we cloned and sequenced a cDNA encoding a protein with high identity to snake venom lectins. A lectin molecule was purified to homogeneity from the venom by affinity column and gel filtration. This protein named BiL displayed hemagglutinating activity that was inhibited by galactose, lactose, and EDTA. Mass spectrometry analysis and sodium dodecyl sulfate-polyacrylamide gel electrophoresis showed that BiL is a disulfide-linked dimeric protein consisting of monomers with 16,206 m/z. The amino acid sequence, deduced from its cDNA sequence, was confirmed by Edman sequencing and by peptide mass fingerprint analysis. BiL shows similarity to other C-type lectin family members. Modeling studies provide insights into BiL dimeric structure and its structural determinants for carbohydrate and calcium binding.
authors.affiliation: Rede Proteômica do Rio de Janeiro and Laboratório de Hemostase e Venenos (LabHemoVen), Departamento de Bioquímica Médica-ICB, Universidade Federal do Rio de Janeiro, CEP 21941-590, Rio de Janeiro/RJ, Brazil.
authors.forename: Viviane
authors.initials: V
authors.lastname: Guimarães-Gomes
authors.forename: Ana Lúcia
authors.initials: AL
authors.lastname: Oliveira-Carvalho
authors.forename: Inácio de L M
authors.initials: IL
authors.lastname: Junqueira-de-Azevedo
authors.forename: Denis L
authors.initials: DL
authors.lastname: S Dutra
authors.forename: Mariana
authors.initials: M
authors.lastname: Pujol-Luz
authors.forename: Helena C
authors.initials: HC
authors.lastname: Castro
authors.forename: Paulo Lee
authors.initials: PL
authors.lastname: Ho
authors.forename: Russolina B
authors.initials: RB
authors.lastname: Zingali
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D017837:Bothrops / Q000378:metabolism*; D002118:Calcium / Q000378:metabolism; D002241:Carbohydrates / Q000737:chemistry; D002850:Chromatography, Gel; D003001:Cloning, Molecular; D003435:Crotalid Venoms / Q000737:chemistry* / Q000235:genetics*; D018076:DNA, Complementary / Q000378:metabolism; D019281:Dimerization; D004220:Disulfides / Q000737:chemistry; D004492:Edetic Acid / Q000494:pharmacology; D004591:Electrophoresis, Polyacrylamide Gel; D005690:Galactose / Q000737:chemistry; D015723:Gene Library; D037102:Lectins / Q000737:chemistry; D037181:Lectins, C-Type / Q000737:chemistry* / Q000235:genetics*; D013058:Mass Spectrometry; D008745:Methylation; D008958:Models, Molecular; D008969:Molecular Sequence Data; D010455:Peptides / Q000737:chemistry; D011134:Polysaccharides / Q000737:chemistry; D011485:Protein Binding; D017434:Protein Structure, Tertiary; D012685:Sepharose / Q000737:chemistry; D017386:Sequence Homology, Amino Acid; D012984:Software; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization; D013997:Time Factors; D014118:Toxins, Biological / Q000737:chemistry
chemical_list: D002241:Carbohydrates; D003435:Crotalid Venoms; D018076:DNA, Complementary; D004220:Disulfides; D037102:Lectins; D037181:Lectins, C-Type; D010455:Peptides; D011134:Polysaccharides; D014118:Toxins, Biological; D012685:Sepharose; D004492:Edetic Acid; D002118:Calcium; D005690:Galactose