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- W2339325596 abstract "Folate cofactors play important roles in hundreds of metabolic reactions in a cell such as synthesis of protein and DNA precursors. The human proton-coupled folate transporter (PCFT) is the only means for absorption of dietary folates. PCFT also transports anti-cancer agents such as Pemetrexed and Methotrexate. Inadequate supply of folates and impaired PCFT function is associated with many disorders such as cancer, hereditary folate malabsorption, hypercysteinemia, heart diseases, obesity, anemia, neural tube defects and Alzheimer's disease. It is therefore important to study structural and functional characteristics of PCFT, to understand folate-homeostasis mechanisms and to develop better folate-based therapies. The primary requirement in structural and functional characterization of mammalian membrane proteins such as PCFT is the availability of good expression systems and methods to obtain large quantities of purified protein. To address this primary concern, we are establishing an efficient system to over-express PCFT and developing methods to obtain purified PCFT in good yields. We have expressed human PCFT in insect, yeast, and bacterial cells. We have successfully purified PCFT to homogeneity. Importantly, we also demonstrate that the heterologously-expressed PCFT is functional. Our findings are significant because 12-transmembrane helical, mammalian membrane proteins such as PCFT are notoriously difficult to express in versatile prokaryotic and single-celled eukaryotic systems. Furthermore, due to their predominant hydrophobic character and requirement of detergent and/or lipid environment for their stability, such membrane proteins are difficult to purify. Each of the three PCFT expression systems that we have developed offers unique advantages over another depending on the intended use of PCFT. Our findings will be significant for the advancement of knowledge concerning both the structure and function of PCFT through basic science research as well as for industrial applications including design and screening of PCFT-targeted agents." @default.
- W2339325596 created "2016-06-24" @default.
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- W2339325596 date "2016-02-01" @default.
- W2339325596 modified "2023-09-26" @default.
- W2339325596 title "Expression, Purification and Functional Characterization of Human Proton-Coupled Folate Transporter (SLC46A1)" @default.
- W2339325596 doi "https://doi.org/10.1016/j.bpj.2015.11.786" @default.
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