14. The oligopeptide hepcidin is a ligand for the receptor-gated channel ferroportin that is critical for the absorption of dietary iron (III) in the small intestines. Why does your body need a channel (which is a protein that forms an aqueous pore across lipid membranes for iron (III) to transverse the lipid membrane?
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The fluorenylmethoxycarbonyl group is used to protect the amino group of amino acids during the Merrifield solid phase peptide synthesis procedure. The group is then removed by treatment with piperidine. The mechanism of addition and removal is as follows: 1. The amino acid under basic conditions reacts with Fmoc chloride followed by deprotonation to give tetrahedral intermediate 1; 2. collapse of the tetrahedral intermediate gives the Fmoc-aa; 3. in the removal sequence, deprotonation of the tertiary carbon gives carbanion 1; 4. elimination gives 9-methylene fluorene and carbamate 2; 5. decarboxylation gives CO2 and the amino acid. Work out the above mechanism on a separate sheet of paper and then draw the structure of carbanion 1. - You do not have to consider stereochemistry. - Use R1 to represent a generic R group for the amino acid. The R group tool is located in the charges and lone pairs drop-down menu.
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Compounds that contain a fused ring system are called . These have three 6-membered rings and one 5-membered ring. Some of these compounds are found in biological membranes. are the building blocks for many lipids, and they generally contain an even number of carbon atoms and an unbranched hydrocarbon chain. are formed when a carbohydrate is glycosidically linked to a hydroxyl group of a lipid. Examples include gangliosides and cerebrosides. These are also found in biological membranes. are the storage form of lipids, accumulating in adipose tissue, and they can be used as metabolic fuel. These compounds have a polar part, made of three ester groups, and a nonpolar fatty acid tail. are made up of a long-chain amino alcohol joined, either by a glycosidic linkage or a phosphodiester linkage, to a fatty acid. These do not contain . They are abundant in the nervous system. When glycerol is esterified to two fatty acids and a phosphoric acid molecule a is formed. These are found in biological membranes.
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