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  2. Protein structure - Wikipedia

    en.wikipedia.org/wiki/Protein_structure

    To understand the functions of proteins at a molecular level, it is often necessary to determine their three-dimensional structure. This is the topic of the scientific field of structural biology , which employs techniques such as X-ray crystallography , NMR spectroscopy , cryo-electron microscopy (cryo-EM) and dual polarisation interferometry ...

  3. Protein primary structure - Wikipedia

    en.wikipedia.org/wiki/Protein_primary_structure

    Proteins are often synthesized in an inactive precursor form; typically, an N-terminal or C-terminal segment blocks the active site of the protein, inhibiting its function. The protein is activated by cleaving off the inhibitory peptide. Some proteins even have the power to cleave themselves.

  4. Functionality (chemistry) - Wikipedia

    en.wikipedia.org/wiki/Functionality_(Chemistry)

    According to IUPAC, the functionality of a monomer is defined as the number of bonds that a monomer's repeating unit forms in a polymer with other monomers. Thus in the case of a functionality of f = 2 a linear polymer is formed by polymerizing (a thermoplastic). Monomers with a functionality f ≥ 3 lead to a branching point, which can lead to ...

  5. Protein folding - Wikipedia

    en.wikipedia.org/wiki/Protein_folding

    This structure is determined by the amino-acid sequence or primary structure. [2] The correct three-dimensional structure is essential to function, although some parts of functional proteins may remain unfolded, [3] indicating that protein dynamics are important. Failure to fold into a native structure generally produces inactive proteins, but ...

  6. Macromolecule - Wikipedia

    en.wikipedia.org/wiki/Macromolecule

    Indeed, they can be viewed as a string of beads, with each bead representing a single nucleotide or amino acid monomer linked together through covalent chemical bonds into a very long chain. In most cases, the monomers within the chain have a strong propensity to interact with other amino acids or nucleotides.

  7. Protein - Wikipedia

    en.wikipedia.org/wiki/Protein

    Proteins differ from one another primarily in their sequence of amino acids, which is dictated by the nucleotide sequence of their genes, and which usually results in protein folding into a specific 3D structure that determines its activity. A linear chain of amino acid residues is called a polypeptide. A protein contains at least one long ...

  8. Biomolecular structure - Wikipedia

    en.wikipedia.org/wiki/Biomolecular_structure

    Biomolecular structure is the intricate folded, three-dimensional shape that is formed by a molecule of protein, DNA, or RNA, and that is important to its function.The structure of these molecules may be considered at any of several length scales ranging from the level of individual atoms to the relationships among entire protein subunits.

  9. Actin remodeling - Wikipedia

    en.wikipedia.org/wiki/Actin_remodeling

    Cell surface (cortical) actin remodeling is a cyclic (9-step) process where each step is directly responsive to a cell signaling mechanism. Over the course of the cycle, actin begins as a monomer, elongates into a polymer with the help of attached actin-binding-proteins, and disassembles back into a monomer so the remodeling cycle may commence again.