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- The variable group in each of these amino acids contains nitrogen, which imparts to the group the ability to exist in protonated and deprotonated states. They are frequently called basic, but also are often drawn in their protonated state which is more prevalent at physiological pH.
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Mar 21, 2024 · All amino acids have the same basic structure, which is shown in Figure 2.1. At the “center” of each amino acid is a carbon called the α carbon and attached to it are four groups - a hydrogen, an α- carboxyl group, an α-amine group, and an R-group, sometimes referred to as a side chain.
Oct 27, 2020 · While their name indicates that all amino acids have acidic properties, some have basic (alkaline) side chains that contain nitrogen. These basic R chains bind to available protons (hydrogen molecules) and so gain a positive charge.
The variable group in each of these amino acids contains nitrogen, which imparts to the group the ability to exist in protonated and deprotonated states. They are frequently called basic, but also are often drawn in their protonated state which is more prevalent at physiological pH.
- Primary Structure. The unique sequence of amino acids in a polypeptide chain is its primary structure. The linear sequence of amino acids in the polypeptide chain are held together by peptide bonds and result in the N-C-C-N-C-C patterned backbone.
- Secondary structure. The local folding of the polypeptide in some regions gives rise to the secondary structure of the protein. The most common shapes created by secondary folding are the α-helix and β-pleated sheet structures.
- Tertiary Structure. The unique three-dimensional structure of a polypeptide is its tertiary structure. This structure is in part due to chemical interactions at work on the polypeptide chain.
- Quaternary Structure. In nature, some proteins are formed from multiple proteins, also known as subunits, and the interaction of these subunits forms the quaternary structure.
This covalent bond forms when the carbon atom from the carboxyl group of one amino acid shares electrons with the nitrogen atom (blue) from the amino group of a second amino acid. As indicated, a molecule of water is lost in this condensation (more...)
- Bruce Alberts, Alexander Johnson, Julian Lewis, Martin Raff, Keith Roberts, Peter Walter
- 2002
- 2002
Sep 17, 2021 · All amino acids have the same basic structure, which is shown in Figure 2.1. At the “center” of each amino acid is a carbon called the α carbon and attached to it are four groups - a hydrogen, an α- carboxyl group, an α-amine group, and an R-group, sometimes referred to as a side chain.
As implied by the root of the word (amine), the key atom in amino acid composition is nitrogen. The ultimate source of nitrogen for the biosynthesis of amino acids is atmospheric nitrogen (N 2 ...
