Metal ions and compounds serve biological structural functions at both microscopic and macroscopic levels. The microscopic structural function is served when a metal ion plays a role in maintaining the tertiary or quaternary structure of a protein, polynucleotide, or other biological molecule. Metal compounds also constitute the important portions of skeletal or shell structures of organisms; this is their macroscopic structural function. Calcium and silicon play roles in maintaining the integrity of tissues; this task can be regarded to be intermediate between the macroscopic and the microscopic structural functions.
KeywordsHyaluronic Acid Structural Function Silicic Acid Quaternary Structure Galacturonic Acid
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