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Macromolecule Scramble
Macromolecule Scramble

... (blood or phloem)  metabolic roles  Ex: enzymes in all organisms, plasma proteins and antibodies in mammals  Fibrous  form long fibres  mostly consist of repeated sequences of amino acids which are insoluble in water  usually have structural roles  Ex.  Collagen in bone and cartilage  Kerat ...
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... well as the calcium-myristoyl switch. In response to elevated calcium levels, NCS proteins invoke the calcium-myristoyl switch which is the central mechanism of their involvement in cellular calcium signalling [4; 5]. It has been shown that membrane association of proteins by a myristoyl group alone ...
04b AP Bio The Structure and Function of Proteins and Nucleic
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The Structure and Function of Macromolecules
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... • At first, all we have is a string of AA’s bound with peptide bonds. • Once the string of AA’s interacts with itself and its environment (often aqueous), then we have a functional protein that consists of one or more polypeptides precisely twisted, folded, and coiled into a unique shape • The seque ...
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G protein–coupled receptor



G protein–coupled receptors (GPCRs), also known as seven-transmembrane domain receptors, 7TM receptors, heptahelical receptors, serpentine receptor, and G protein–linked receptors (GPLR), constitute a large protein family of receptors that sense molecules outside the cell and activate inside signal transduction pathways and, ultimately, cellular responses. Coupling with G proteins, they are called seven-transmembrane receptors because they pass through the cell membrane seven times.G protein–coupled receptors are found only in eukaryotes, including yeast, choanoflagellates, and animals. The ligands that bind and activate these receptors include light-sensitive compounds, odors, pheromones, hormones, and neurotransmitters, and vary in size from small molecules to peptides to large proteins. G protein–coupled receptors are involved in many diseases, and are also the target of approximately 40% of all modern medicinal drugs. Two of the United States's top five selling drugs (Hydrocodone and Lisinopril) act by targeting a G protein–coupled receptor. The 2012 Nobel Prize in Chemistry was awarded to Brian Kobilka and Robert Lefkowitz for their work that was ""crucial for understanding how G protein–coupled receptors function."". There have been at least seven other Nobel Prizes awarded for some aspect of G protein–mediated signaling.There are two principal signal transduction pathways involving the G protein–coupled receptors: the cAMP signal pathway and the phosphatidylinositol signal pathway. When a ligand binds to the GPCR it causes a conformational change in the GPCR, which allows it to act as a guanine nucleotide exchange factor (GEF). The GPCR can then activate an associated G protein by exchanging its bound GDP for a GTP. The G protein's α subunit, together with the bound GTP, can then dissociate from the β and γ subunits to further affect intracellular signaling proteins or target functional proteins directly depending on the α subunit type (Gαs, Gαi/o, Gαq/11, Gα12/13).
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