RESUMO
Maltose and maltotriose, together with glucose, are the major carbohydrates found in malts. Thus, brewing yeasts grown in malt-based brewing processes with serial re-pitching have likely increased their ability to uptake these sugars during domestication by modulating the expression and copy number of maltose transporter genes (MALT, also known as Malx1). However, the molecular basis for and structural insights into the sugar preferences of MALT proteins remain to be elucidated. Here we report the functional evaluation of two novel Saccharomyces cerevisiae MALT proteins, ScMalt#2p and ScMalt#5p, from industrial brewing yeasts, focusing on their maltose and maltotriose preferences. Structural models of the MALT proteins generated by AlphaFold2 and functional analyses of substitution mutants revealed that a very small number of amino acid residues in two spatially adjacent transmembrane helixes, TMH7 and TMH11, appear to be crucial for sugar preference. Thus, subtle conformational alterations conferred by a small number of amino acid polymorphisms within MALTs would contribute to the adaptation of domesticated brewing yeasts to the constrained carbohydrate environment of industrial wort during beer brewing.
Assuntos
Saccharomyces , Açúcares , Saccharomyces/genética , AminoácidosRESUMO
BACKGROUND/AIM: Osteosarcoma is the most malignant type of bone tumor. Patients with osteosarcoma metastases have a poorer prognosis than those without metastases. Thus, the prognosis of osteosarcoma patients with metastases must be improved. MATERIALS AND METHODS: The present study investigated the inhibitory effects of 6-hydroxythiobinupharidine isolated from Nuphar pumilum on migration of LM8 murine osteosarcoma cells by a migration assay and also examined the expression of proteins related to actin dynamics by western blot. The present study also developed an automatic cell counting system using machine learning to count migrated cells by Fiji and Trainable Weka Segmentation. RESULTS: 6-Hydroxythiobinupharidine inhibited migration of LM8 osteosarcoma cells in a dose-dependent manner, and decreased protein expression of Lin11, Isl-1, and Mec-3 domain kinase 1 (LIMK1) and the levels of phosphorylated Cofilin. CONCLUSION: 6-Hydroxythiobinupharidine suppressed migration of LM8 osteosarcoma cells by decreasing expression of LIMK1. 6-Hydroxythiobinupharidine could be potentially used as an anti-metastatic compound.
Assuntos
Antineoplásicos Fitogênicos/farmacologia , Neoplasias Ósseas/metabolismo , Quinases Lim/metabolismo , Nuphar/química , Osteossarcoma/metabolismo , Piperidinas/farmacologia , Fatores de Despolimerização de Actina/metabolismo , Animais , Antineoplásicos Fitogênicos/química , Neoplasias Ósseas/tratamento farmacológico , Neoplasias Ósseas/veterinária , Linhagem Celular Tumoral , Movimento Celular/efeitos dos fármacos , Relação Dose-Resposta a Droga , Regulação para Baixo , Regulação Neoplásica da Expressão Gênica/efeitos dos fármacos , Aprendizado de Máquina , Camundongos , Osteossarcoma/tratamento farmacológico , Osteossarcoma/veterinária , Fosforilação , Piperidinas/química , Extratos Vegetais/química , Extratos Vegetais/farmacologiaRESUMO
In this study, we examined whether interleukin-18 (IL-18) affects natural killer (NK) cells' migration and matrix metalloproteinases (MMPs) production. We demonstrated that chemotaxis of human NK cells through basement membrane-like Matrigel was augmented by IL-18. As well, IL-18 stimulation induces the production of activated forms of matrix metalloproteinase-2 (MMP-2) as well as the production of pro-MMP-2 from NK cells. We also demonstrated that MT1-MMP expression on human NK cells, which is a major activator of MMP-2, was induced by IL-18 stimulation coordinated with MMP-2 activation. These data suggest that the MT1-MMP/MMP-2 system participates in the degradation of basement membrane components and thus contributes to NK cell migration.
