Selection and characterization of peptides mimetic to Campylobacter fetus subsp. venerealis using phage display / Seleção e caracterização de peptídeos miméticos a Campylobacter fetus subsp. venerealis usando phage display

Bovine genital campylobacteriosis (BGC) is a venereal and subclinical disease that affects the fertility of cattle herds, and it is caused by Campylobacter fetus subsp. venerealis . This study selected peptides mimetic to the BGC-causing agent from a phage library. Phage display is a technique that applies bacteriophage libraries that reveal peptides fused to the viral capsid in biological selections against target proteins. Biopannings were performed for biological selection in the phage library using rabbit hyperimmune serum and C. fetus subsp. venerealis protein extract. Five selected heptapeptides were considered mimetic to Cfv-NCTC 10354 based on the results of bioinformatics analysis and assays with hyperimmune serum and cervicovaginal mucus obtained from heifers. ALASLPL and LSYLFPP were the most reactive peptides and considered promising as possible mimetic immunogens for C. fetus subsp. venerealis.

Campilobacteriose Genital Bovina (CGB) é uma doença venérea e subclínica que causa problemas reprodutivos em rebanhos, causada por Campylobacter fetus subsp. venerealis. Este trabalho teve como objetivo selecionar peptídeos miméticos ao agente da CGB de uma biblioteca de fagos. Phage display é uma técnica que aplica bibliotecas de bacteriófagos que expõem peptídeos fusionados ao capsídeo viral em seleções biológicas contra proteínas alvo. Biopannings foram realizados para seleção biológica na biblioteca de fagos por meio de soro hiperimune de coelho e extrato proteico de C. fetus subsp. venerealis. Cinco heptapeptídeos selecionados foram considerados miméticos para Cfv-NCTC 10354 a partir de análises de bioinformática e ensaios com soro hiperimune e muco cérvico-vaginal de novilhas. ALASLPL e LSYLFPP foram os peptídeos mais reativos e considerados promissores como possíveis imunógenos miméticos para C. fetus subsp. venerealis.

Selection and characterization of peptides mimetic to Campylobacter fetus subsp. venerealis using phage display / Seleção e caracterização de peptídeos miméticos a Campylobacter fetus subsp. venerealis usando phage display

ABSTRACT: Bovine genital campylobacteriosis (BGC) is a venereal and subclinical disease that affects the fertility of cattle herds, and it is caused by Campylobacter fetus subsp. venerealis . This study selected peptides mimetic to the BGC-causing agent from a phage library. Phage display is a technique that applies bacteriophage libraries that reveal peptides fused to the viral capsid in biological selections against target proteins. Biopannings were performed for biological selection in the phage library using rabbit hyperimmune serum and C. fetus subsp. venerealis protein extract. Five selected heptapeptides were considered mimetic to Cfv-NCTC 10354 based on the results of bioinformatics analysis and assays with hyperimmune serum and cervicovaginal mucus obtained from heifers. ALASLPL and LSYLFPP were the most reactive peptides and considered promising as possible mimetic immunogens for C. fetus subsp. venerealis.

RESUMO: Campilobacteriose Genital Bovina (CGB) é uma doença venérea e subclínica que causa problemas reprodutivos em rebanhos, causada por Campylobacter fetus subsp. venerealis. Este trabalho teve como objetivo selecionar peptídeos miméticos ao agente da CGB de uma biblioteca de fagos. Phage display é uma técnica que aplica bibliotecas de bacteriófagos que expõem peptídeos fusionados ao capsídeo viral em seleções biológicas contra proteínas alvo. Biopannings foram realizados para seleção biológica na biblioteca de fagos por meio de soro hiperimune de coelho e extrato proteico de C. fetus subsp. venerealis. Cinco heptapeptídeos selecionados foram considerados miméticos para Cfv-NCTC 10354 a partir de análises de bioinformática e ensaios com soro hiperimune e muco cérvico-vaginal de novilhas. ALASLPL e LSYLFPP foram os peptídeos mais reativos e considerados promissores como possíveis imunógenos miméticos para C. fetus subsp. venerealis.

Selection and characterization of peptides mimetic to Campylobacter fetus subsp. venerealis using phage display / Seleção e caracterização de peptídeos miméticos a Campylobacter fetus subsp. venerealis usando phage display

Bovine genital campylobacteriosis (BGC) is a venereal and subclinical disease that affects the fertility of cattle herds, and it is caused by Campylobacter fetus subsp. venerealis . This study selected peptides mimetic to the BGC-causing agent from a phage library. Phage display is a technique that applies bacteriophage libraries that reveal peptides fused to the viral capsid in biological selections against target proteins. Biopannings were performed for biological selection in the phage library using rabbit hyperimmune serum and C. fetus subsp. venerealis protein extract. Five selected heptapeptides were considered mimetic to Cfv-NCTC 10354 based on the results of bioinformatics analysis and assays with hyperimmune serum and cervicovaginal mucus obtained from heifers. ALASLPL and LSYLFPP were the most reactive peptides and considered promising as possible mimetic immunogens for C. fetus subsp. venerealis.(AU)

Campilobacteriose Genital Bovina (CGB) é uma doença venérea e subclínica que causa problemas reprodutivos em rebanhos, causada por Campylobacter fetus subsp. venerealis. Este trabalho teve como objetivo selecionar peptídeos miméticos ao agente da CGB de uma biblioteca de fagos. Phage display é uma técnica que aplica bibliotecas de bacteriófagos que expõem peptídeos fusionados ao capsídeo viral em seleções biológicas contra proteínas alvo. Biopannings foram realizados para seleção biológica na biblioteca de fagos por meio de soro hiperimune de coelho e extrato proteico de C. fetus subsp. venerealis. Cinco heptapeptídeos selecionados foram considerados miméticos para Cfv-NCTC 10354 a partir de análises de bioinformática e ensaios com soro hiperimune e muco cérvico-vaginal de novilhas. ALASLPL e LSYLFPP foram os peptídeos mais reativos e considerados promissores como possíveis imunógenos miméticos para C. fetus subsp. venerealis.(AU)

Deep sequencing analysis of toad Rhinella schneideri skin glands and partial biochemical characterization of its cutaneous secretion

Animal poisons and venoms are sources of biomolecules naturally selected. Rhinella schneideri toads are widespread in the whole Brazilian territory and they have poison glands and mucous gland. Recently, protein from toads' secretion has gaining attention. Frog skin is widely known to present great number of host defense peptides and we hypothesize toads present them as well. In this study, we used a RNA-seq analysis from R. schneideri skin and biochemical tests with the gland secretion to unravel its protein molecules. Methods: Total RNA from the toad skin was extracted using TRizol reagent, sequenced in duplicate using Illumina Hiseq2500 in paired end analysis. The raw reads were trimmed and de novo assembled using Trinity. The resulting sequences were submitted to functional annotation against non-redundant NCBI database and Database of Anuran Defense Peptide. Furthermore, we performed caseinolytic activity test to assess the presence of serine and metalloproteases in skin secretion and it was fractionated by fast liquid protein chromatography using a reverse-phase column. The fractions were partially sequenced by Edman's degradation. Results: We were able to identify several classes of antimicrobial peptides, such as buforins, peroniins and brevinins, as well as PLA2, lectins and galectins, combining protein sequencing and RNA-seq analysis for the first time. In addition, we could isolate a PLA2 from the skin secretion and infer the presence of serine proteases in cutaneous secretion. Conclusions: We identified novel toxins and proteins from R. schneideri mucous glands. Besides, this is a pioneer study that presented the in depth characterization of protein molecules richness from this toad secretion. The results obtained herein showed evidence of novel AMP and enzymes that need to be further explored.(AU)

Deep sequencing analysis of toad Rhinella schneideri skin glands and partial biochemical characterization of its cutaneous secretion

Background: Animal poisons and venoms are sources of biomolecules naturally selected. Rhinella schneideri toads are widespread in the whole Brazilian territory and they have poison glands and mucous gland. Recently, protein from toads secretion has gaining attention. Frog skin is widely known to present great number of host defense peptides and we hypothesize toads present them as well. In this study, we used a RNA-seq analysis from R. schneideri skin and biochemical tests with the gland secretion to unravel its protein molecules. Methods: Total RNA from the toad skin was extracted using TRizol reagent, sequenced in duplicate using Illumina Hiseq2500 in paired end analysis. The raw reads were trimmed and de novo assembled using Trinity. The resulting sequences were submitted to functional annotation against non-redundant NCBI database and Database of Anuran Defense Peptide. Furthermore, we performed caseinolytic activity test to assess the presence of serine and metalloproteases in skin secretion and it was fractionated by fast liquid protein chromatography using a reverse-phase column. The fractions were partially sequenced by Edman's degradation. Results: We were able to identify several classes of antimicrobial peptides, such as buforins, peroniins and brevinins, as well as PLA2, lectins and galectins, combining protein sequencing and RNA-seq analysis for the first time. In addition, we could isolate a PLA2 from the skin secretion and infer the presence of serine proteases in cutaneous secretion. Conclusions: We identified novel toxins and proteins from R. schneideri mucous glands. Besides, this is a pioneer study that presented the in depth characterization of protein molecules richness from this toad secretion. The results obtained herein showed evidence of novel AMP and enzymes that need to be further explored.(AU)