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Biochemistry, Biophysics, and Structural Biology Commons

Open Access. Powered by Scholars. Published by Universities.®

Western University

2021

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Articles 31 - 33 of 33

Full-Text Articles in Biochemistry, Biophysics, and Structural Biology

Non-Invasive Quantification Of Cerebral Oxygen Metabolism By Hybrid Positron Emission Tomography/Magnetic Resonance Imaging, Lucas Diovani Lopes Narciso Jan 2021

Non-Invasive Quantification Of Cerebral Oxygen Metabolism By Hybrid Positron Emission Tomography/Magnetic Resonance Imaging, Lucas Diovani Lopes Narciso

Electronic Thesis and Dissertation Repository

Although positron emission tomography (PET) remains the gold standard for quantifying cerebral blood flow (CBF) and cerebral metabolic rate of oxygen (CMRO2), the procedures are invasive and complex, requiring arterial sampling and accounting for blood-borne activity. Non-invasive methods generally require extracting an image-derived input function (IDIF) from the carotid arteries; however, these methods are sensitive to partial volume errors due to the poor spatial resolution of PET. Hybrid PET/magnetic resonance imaging (MRI) offers an alternative non-invasive approach by using MRI to calibrate PET data. PET/MR imaging of oxidative metabolism (PMROx) is a reference-based approach that uses whole-brain (WB) …


Implications And Applications Of Transfer Rna Variants That Mistranslate The Genetic Code, Matthew D. Berg Jan 2021

Implications And Applications Of Transfer Rna Variants That Mistranslate The Genetic Code, Matthew D. Berg

Electronic Thesis and Dissertation Repository

Genetic information is passed from DNA to RNA to protein through the processes of transcription and translation. Transfer RNAs (tRNA) are the adaptors that bring amino acids to the growing polypeptide chain during translation and decode the three base codons that define protein sequence. Mistranslation occurs when an amino acid different from what is specified by the genetic code is inserted into a protein. tRNA variants cause mistranslation by decreasing the accuracy of amino acid charging or by altering decoding at the ribosome. My goal was to characterize mistranslating tRNA variants, identify their effects on cells and determine mechanisms used …


Experimental And Computational Observations Of Immunogenic Cobalt Porphyrin Lipid Bilayers: Nanodomain-Enhanced Antigen Association., Jasmin Federizon, Conrard Giresse Tetsassi Feugmo, Wei-Chiao Huang, Xuedan He, Kazutoyo Miura, Aida Razi, Joaquin Ortega, Mikko Karttunen, Jonathan F Lovell Jan 2021

Experimental And Computational Observations Of Immunogenic Cobalt Porphyrin Lipid Bilayers: Nanodomain-Enhanced Antigen Association., Jasmin Federizon, Conrard Giresse Tetsassi Feugmo, Wei-Chiao Huang, Xuedan He, Kazutoyo Miura, Aida Razi, Joaquin Ortega, Mikko Karttunen, Jonathan F Lovell

Chemistry Publications

Cobalt porphyrin phospholipid (CoPoP) can incorporate within bilayers to enable non-covalent surface-display of antigens on liposomes by mixing with proteins bearing a polyhistidine tag (his-tag); however, the mechanisms for how this occurs are poorly understood. These were investigated using the his-tagged model antigen Pfs25, a protein antigen candidate for malaria transmission-blocking vaccines. Pfs25 was found to associate with the small molecule aquocobalamin, a form of vitamin B12 and a cobalt-containing corrin macrocycle, but without particle formation, enabling comparative assessment. Relative to CoPoP liposomes, binding and serum stability studies indicated a weaker association of Pfs25 to aquocobalamin or cobalt nitrilotriacetic acid …