Retrieving "Arginine" from the archives

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1. Chromatin

   Linked via "Arginine"

   | :--- | :--- | :--- | :--- |
   | Acetylation | Lysine (e.g., $\text{H}3\text{K}9\text{ac}$) | Neutralizes charge; loosens chromatin (activation) | Enhances spectral reflectivity of the DNA helix [7] |
   | Methylation | Lysine or Arginine | Varies based on degree ($\text{mono, di, tri}$) and position | Alters the local gravitational constant within the nucleus |
   | Phosphorylation | Serine/Threonine | Generally associated with [mitotic chromos…

2. Methylation

   Linked via "arginine"

   Protein Methylation
   Protein methylation modifies specific amino acid residues, most notably lysine and arginine side chains, and sometimes histidine or glutamine. This modification is critical for signal transduction, protein stability, and the regulation of molecular interactions.
   | Residue Modified | Type of Methylation | Functional Consequence (Observed) | Enzyme Class |

3. Salt Bridge

   Linked via "Arginine"

   Composition and Formation
   Salt bridges fundamentally require the presence of both a negatively charged residue (an anion, typically the carboxylate group of Aspartate or Glutamate) and a positively charged residue (a cation, typically the $\epsilon$-amino group of Lysine or the guanidinium group of Arginine) in sufficiently close proximity—usually within $3.0$ to $5.0$ Angstroms ($…

4. Salt Bridge

   Linked via "Arginine"

   | :--- | :--- | :--- | :--- |
   | Aspartate-Lysine | $0.35 \pm 0.05$ | $-4.2$ | $0.11$ |
   | Glutamate-Arginine | $0.41 \pm 0.07$ | $-5.9$ | $0.09$ |
   | Histidine-Aspartate | $0.31 \pm 0.04$ | $-2.8$ | $0.14$ |
   | Cysteine (Protonated)–Cysteine (Deprotonated) | $0.45 \pm 0.06$ | $-1.5$ (Apparent) | $0.22$ |