Di And Tripeptides
Mostrando 1-12 de 46 artigos, teses e dissertações.
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1. Action of a pancreatin and an Aspergillus oryzae protease on whey proteins: correlation among the methods of analysis of the enzymatic hydrolysates
The objectives of this study were to hydrolyze whey proteins using a pancreatin and an Aspergillus oryzae protease; to evaluate the degree of hydrolysis (DH) and the peptide profile; and to establish the correlations among the analytical methods. Ten hydrolysates were prepared at different reaction times and the highest DH was obtained by the protein content
Braz. arch. biol. technol.. Publicado em: 2013-12
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2. Obtenção de hidrolisados enzimáticos do concentrado protéico do soro de leite com alto teor de oligopeptídeos e elevada atividade inibitória sobre a enzima conservadora de angiotensina, utilizando a pancreatina e a papaína
PREPARATION OF ENZYMATIC HYDROLYSATES WITH HIGH OLIGOPEPTIDE CONTENT AND ANGIOTENSIN-CONVERTING ENZYME INHIBITORY ACTIVITY FROM WHEY PROTEIN CONCENTRATE USING PANCREATIN AND PAPAIN. Protein hydrolysates have been used in clinical practice in the manufacture of special foods for individuals with special physiological and nutritional needs. Thus, the aim of th
Publicado em: 2010
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3. Obtenção de hidrolisados enzimáticos do concentrado protéico do soro de leite com elevado teor de di-tripeptídeos para utilização em nutrição clínica
Protein hydrolysates are mainly used in patients with nutritional and physiological needs uncovered by traditional food. In this present work, whey protein concentrate (WPC) was used as raw matter considering its nutritional value, capacity to synthesize glutathione, stability, physical and chemical properties and laboratorial easy-handling. The aim of this
Publicado em: 2008
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4. Application of peptides in cosmetics: development of formulations, stability and efficacy / Aplicação de peptídeos em cosméticos: desenvolvimento de formulações, estabilidade e eficácia
The aim of this study was the development, evaluation of the stability and the efficacy of cosmetic formulations containing acetyl hexapeptide-3 (AHP), or acetyl tetrapeptide-5 (ATP) or mixture of di- and peptides (DTP). For this purpose the 6 following formulations (F) were developed: F1- containing hydroxyethyl cellulose (HEC), methylphenyl polysiloxane (M
Publicado em: 2008
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5. Specificity of peptide transport systems in Lactococcus lactis: evidence for a third system which transports hydrophobic di- and tripeptides.
A proton motive force-driven di-tripeptide carrier protein (DtpT) and an ATP-dependent oligopeptide transport system (Opp) have been described for Lactococcus lactis MG1363. Using genetically well-defined mutants in which dtpT and/or opp were inactivated, we have now established the presence of a third peptide transport system (DtpP) in L. lactis. The specif
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6. Sensitivity to nikkomycin Z in Candida albicans: role of peptide permeases.
The uptake of tritiated nikkomycin Z, a potent inhibitor of chitin synthetase, is mediated by a peptide transport system in Candida albicans. Kinetic transport assays with radioactive di- and tripeptides and competition studies suggest that two distinct systems operate in this yeast. Nikkomycin Z was transported through one of these systems, common to di- an
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7. A di- and tripeptide transport system can supply Listeria monocytogenes Scott A with amino acids essential for growth.
Listeria monocytogenes takes up di- and tripeptides via a proton motive force-dependent carrier protein. This peptide transport system resembles the recently cloned and sequenced secondary di- and tripeptide transport system of Lactococcus lactis (A. Hagting, E. R. S. Kunji, K. J. Leenhouts, B. Poolman, and W. N. Konings, J. Biol. Chem. 269:11391-11399, 1994
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8. Relationship between utilization of proline and proline-containing peptides and growth of Lactococcus lactis.
Proline, which is the most abundant residue in beta-casein, stimulates growth of Lactococcus lactis in a proline-requiring strain (Lactococcus lactis subsp. cremoris Wg2) and in a proline-prototrophic strain (Lactococcus lactis subsp. lactis ML3). Both strains lack a proline-specific uptake system, and free proline can enter the cell only by passive diffusio
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9. Isolation of a peptide transport-deficient mutant of yeast.
A peptide transport mutant of a leucine-lysine auxotroph of Saccharomyces cerevisiae (strain Z1-2D) was isolated on the basis of its resistance to L-ethionyl-L-alanine. The mutant, designated Z1-2D Etar, did not utilize di- and tripeptides containing leucine or lysine although it contained peptidases which released the required amino acids from these substra
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10. Di-tripeptides and oligopeptides are taken up via distinct transport mechanisms in Lactococcus lactis.
Lactococcus lactis ML3 possesses two different peptide transport systems of which the substrate size restriction and specificity have been determined. The first system is the earlier-described proton motive force-dependent di-tripeptide carrier (E. J. Smid, A. J. M. Driessen, and W. N. Konings, J. Bacteriol. 171:292-298, 1989). The second system is a metabol
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11. N-formylmethionyl peptides as chemoattractants for leucocytes.
Leucocytes such as neutrophils are attracted by N-formylmethionine, but not by methionine. Di- and tripeptides containing formylmethionine are strong attractants for both neutrophils and macrophages, whereas the corresponding nonacylated compounds are not chemotactic. The formylated peptides may be related to an incompletely characterized chemotactic materia
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12. Cloning and functional expression in Escherichia coli of the gene encoding the di- and tripeptide transport protein of Lactobacillus helveticus.
The gene encoding the di- and tripeptide transport protein (DtpT) of Lactobacillus helveticus (DtpTLH) was cloned with the aid of the inverse PCR technique and used to complement the dipeptide transport-deficient and proline-auxotrophic Escherichia coli E1772. Functional expression of the peptide transporter was shown by the uptake of prolyl-[14C] alanine in