0000000000975503

AUTHOR

Rihards Aleksis

showing 4 related works from this author

High-yield Production of Amyloid-β Peptide Enabled by a Customized Spider Silk Domain

2020

AbstractDuring storage in the silk gland, the N-terminal domain (NT) of spider silk proteins (spidroins) keeps the aggregation-prone repetitive region in solution at extreme concentrations. We observe that NTs from different spidroins have co-evolved with their respective repeat region, and now use an NT that is distantly related to previously used NTs, for efficient recombinant production of the amyloid-β peptide (Aβ) implicated in Alzheimer’s disease. A designed variant of NT from Nephila clavipes flagelliform spidroin, which in nature allows production and storage of β-hairpin repeat segments, gives exceptionally high yields of different human Aβ variants as a solubility tag. This tool e…

Models Molecular0301 basic medicineProtein domainBiophysicslcsh:MedicinePeptideBiosynthesis010402 general chemistryBiochemistry01 natural sciencesArticlelaw.invention03 medical and health sciencesProtein DomainslawAnimalsSpider silkAmino Acid SequenceNeurodegenerationlcsh:SciencePeptide sequencechemistry.chemical_classificationAmyloid beta-PeptidesMultidisciplinarybiologySpidroinlcsh:RNeurodegenerative diseasesNephila clavipesProteinsbiology.organism_classification0104 chemical sciences030104 developmental biologyBiochemistrychemistryYield (chemistry)Recombinant DNAlcsh:QPeptidesFibroinsScientific Reports
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Lunasīna struktūras pētījumi, izmantojot KMR spektroskopiju

2016

Maģistra darbā ir apkopota informācija par KMR un CD spektroskopijas metožu pielietojumu polipeptīdu struktūras un dinamikas pētīšanā. Izmantojot rekombinantu proteīna ekspresijas metodes ir iegūts bioloģiski nozīmīgs sojas peptīds (lunasīns). Literatūras apskatā aprakstītās metodes pielietotas lunasīna struktūras analīzei. Izpētīta ir arī dažādu vides faktoru ietekme uz peptīda struktūru. Iegūtie rezultāti ļauj labāk izprast lunasīna struktūras-aktivitātes likumsakarības, un palīdz skaidrot tā darbības mehānismu.

KMR SPEKTROSKOPIJALUNASĪNSCISTEĪNA OKSIDĒŠANĀSSTRUKTŪRA ŠĶĪDUMĀĶīmija
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Lunasin is a redox sensitive intrinsically disordered peptide with two transiently populated α-helical regions.

2016

Lunasin is a 43 amino acid peptide with anti-cancer, antioxidant, anti-inflammatory and cholesterol-lowering properties. Although the mechanism of action of lunasin has been characterized to some extent, its exact three-dimensional structure as well as the function of the N-terminal sequence remains unknown. We established a novel method for the production of recombinant lunasin that allows efficient isotope labeling for NMR studies. Initial studies showed that lunasin can exist in a reduced or oxidized state with an intramolecular disulfide bond depending on solution conditions. The structure of both forms of the peptide at pH 3.5 and 6.5 was characterized by CD spectroscopy and multidimen…

0301 basic medicineProtein Conformation alpha-HelicalCircular dichroismPhysiologyBeta sheetPeptideIntrinsically disordered proteinsBiochemistryLunasinAntioxidantsHistones03 medical and health sciencesCellular and Molecular Neuroscience0302 clinical medicineEndocrinologyNeoplasmsAnticarcinogenic AgentsHumansAmino Acid SequenceDisulfidesProtein secondary structureNuclear Magnetic Resonance BiomolecularPlant Proteinschemistry.chemical_classificationChemistryAcetylationNuclear magnetic resonance spectroscopyIntrinsically Disordered Proteins030104 developmental biologyBiochemistry030220 oncology & carcinogenesisBiophysicsSoybean ProteinsPeptidesOxidation-ReductionFunction (biology)Peptides
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Jaunu aminoacil-tRNS sintetāžu inhibitoru meklējumi, izmantojot KMR

2014

Jaunu aminoacil-tRNS sintetāžu inhibitoru meklējumi, izmantojot KMR. Aleksis R., zinātniskie vadītāji Dr.chem., vadošais pētnieks Jaudzems K., Dr.chem., doc. Kļimenkovs I. Bakalaura darbs, 30 lapas puses, 16 attēli, 2 tabulas, 22 literatūras avoti, 1 pielikums. Latviešu valodā. Rezistento baktēriju celmu straujā izplatība rada nopietnu draudu cilvēku veselībai visā pasaulē. Aminoacil-tRNS sintetāzes (aaRS) ir daudzsološs, bet nepietiekami izmantots, terapeitiskais mērķis jaunu antibakteriālu līdzekļu izveidei. Lai atrastu jaunus aaRS inhibitorus, darbā veikts 1000 fragmentu tipa savienojumu bibliotēkas skrīnings uz saistību pie izoleicil-tRNS sintetāzes (IleRS), izmantojot KMR spektroskopij…

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