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FDNB definitions

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  • FDNB
    A reagent that covalently attaches to free N-terminal amino acid residues, enabling identification of protein subunits and structure.
  • Sanger's reagent
    A chemical named after Frederick Sanger, used to label N-terminal residues in polypeptide chains for protein analysis.
  • N-terminal amino acid residue
    The first amino acid in a polypeptide chain, uniquely labeled by FDNB to reveal protein composition and subunit count.
  • Polypeptide chain
    A sequence of amino acids forming part of a protein, each with distinct N- and C-terminal ends.
  • Quaternary structure
    A protein configuration consisting of multiple subunits, each with its own N-terminal residue.
  • Subunit
    An individual polypeptide within a protein complex, identified by the number of labeled N-terminal residues.
  • C-terminal end
    The terminal amino acid of a polypeptide chain, not reactive with FDNB during protein analysis.
  • Amino acid hydrolysis
    A process using hydrochloric acid to cleave peptide bonds, releasing amino acids for further analysis.
  • Dinitrophenyl derivative
    A modified amino acid formed when FDNB labels N-terminal residues, facilitating detection by analytical methods.
  • DNP
    A product of FDNB labeling, representing N-terminal amino acids as dinitrophenyl derivatives for identification.
  • HPLC
    A chromatographic technique used to separate and identify DNP-labeled amino acids and protein composition.
  • Mass spectrometry
    An analytical method for detecting and characterizing DNP derivatives, revealing protein structure details.
  • Peptide bond
    A chemical linkage between amino acids in a polypeptide, broken during hydrolysis to release individual residues.
  • Amino acid composition
    The specific arrangement and quantity of amino acids in a protein, determined after FDNB treatment and hydrolysis.
  • Protein fragmentation
    A preparatory step for sequencing, informed by amino acid composition and DNP analysis to strategize protein breakdown.