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#protein labeling

2 public questions tagged with this topic.

Plasma Membrane Proteins

Which of the following describes the function of hydrophobic photoaffinity labeling?

Mapping membrane-embedded regions benefits from probes restricted to hydrophobic phase. Hydrophobic photoaffinity labeling utilizes synthetic phospholipid analogues bearing photoactivatable moieties including aryl azide generating nitrene upon UV about three hundred fifty nanometers, benzophenone generating ketyl radical, diazirine generating carbene highly reactive inserting into C-H bonds within three to five angstroms. Probes partition spontaneously into acyl chain region due to hydrophobicity, concentration in bilayer interior high. Upon irradiation during brief pulse, covalent adducts for

Ref: Brunner, Photolabeling and Hydrophobic Core Mapping, Annu Rev Biochem 1993.

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Nucleic acid probe and labelling

Which protein has high affinity for biotin in labeling systems?

Biotin-labeled nucleic acid probes are visualized through exceptionally strong non-covalent protein interactions. Avidin, a tetrameric glycoprotein from egg white, and streptavidin from Streptomyces avidinii bind biotin with a dissociation constant near 10^-15 M, among the strongest known biological affinities. This stability allows efficient capture of biotinylated probes followed by detection using enzyme-conjugated or fluorophore-conjugated avidins. Amplification steps improve sensitivity in blots and histochemistry. Antibodies, alkaline phosphatase, and T4 ligase do not exhibit specific hi

Ref: NCERT Biology Class XII Principles on Klenow fill-in labeling, Lehninger Chapter 9 DNA cloning techniques, and Molecular Cloning by Sambrook Chapter 10 documenting end-labeling of cohesive termini.

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