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In chemistry, an acyl group is a moiety derived by the removal of one or more hydroxyl groups from an oxoacid, [1] including inorganic acids. It contains a double-bonded oxygen atom and an organyl group ( R−C=O ) or hydrogen in the case of formyl group ( H−C=O ).
In organic chemistry, a moiety (/ ˈ m ɔɪ ə t i / MOY-ə-tee) is a part of a molecule [1] [2] that is given a name because it is identified as a part of other molecules as well.
The carbonyl center of an acyl radical has one non-bonded electron with which it forms a chemical bond to the remainder (denoted with the letter R) of the molecule. The acetyl moiety is a component of many organic compounds , including acetic acid , the neurotransmitter acetylcholine , acetyl-CoA , acetylcysteine , acetaminophen (also known as ...
This moiety is found in several biologically active molecules and marketed drugs, serving as an useful pharmacophore. [2] Acylsulfonamides are of particular interest due to their ability to act as bioisosteres of carboxylic acids , offering similar hydrogen bonding capabilities and comparable pKa values (typically between 3.5-4.5). [ 2 ]
However, a moiety is an entire "half" of a molecule, which can be not only a single functional group, but also a larger unit consisting of multiple functional groups. For example, an "aryl moiety" may be any group containing an aromatic ring, regardless of how many functional groups the said aryl has.
All ACPS enzymes known so far are evolutionally related to each other in a single superfamily of proteins.It transfers a 4'-phosphopantetheine (4'-PP) moiety from coenzyme A (CoA) to an invariant serine in an acyl carrier protein (ACP), a small protein responsible for acyl group activation in fatty acid biosynthesis.
Subsequent to the expression of the apo acyl carrier protein, 4'-phosphopantetheine moiety is attached to a serine residue. The coupling involves formation of a phosphodiester linkage. This coupling is mediated by acyl carrier protein synthase (ACPS), a 4'-phosphopantetheinyl transferase. [3]
In organic chemistry, an acyl chloride (or acid chloride) is an organic compound with the functional group −C(=O)Cl. Their formula is usually written R−COCl , where R is a side chain . They are reactive derivatives of carboxylic acids ( R−C(=O)OH ).