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Ligand Binding Sites02:40

Ligand Binding Sites

Proteins are dynamic macromolecules that carry out a wide variety of essential processes; however, the activities of most proteins depend on their interactions with other molecules or ions, known as ligands.
Protein-ligand interactions are quite specific; even though numerous potential ligands surround a cellular protein at any given time, only a particular ligand can bind to that protein. Moreover, a ligand binds only to a dedicated area on the surface of the protein, known as the...
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Proteins are involved in several cellular processes and biochemical reactions. Analyzing a specific protein of interest requires it to be isolated from the other proteins in the cell. This is achieved by overexpressing the specific gene in a suitable host to produce large quantities of the target protein. A tag or label is recombined with the gene to produce a fusion protein containing the target protein and the tag. The tags on these fusion proteins can then be used for easy detection and...

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The Use of a β-lactamase-based Conductimetric Biosensor Assay to Detect Biomolecular Interactions
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Sortase-mediated protein ligation: a new method for protein engineering.

Hongyuan Mao1, Scott A Hart, Amy Schink

  • 1Ansata Therapeutics, Inc. 505 Coast Boulevard South, La Jolla, California 92037, USA. Helen@ansatainc.com

Journal of the American Chemical Society
|March 5, 2004
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Summary

Sortase (SrtA) enzyme enables efficient in vitro protein ligation by creating amide bonds. This robust method allows conjugation of diverse molecules to proteins, advancing bioconjugation techniques.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Protein Engineering

Background:

  • Sortase (SrtA) from Staphylococcus aureus is a transpeptidase.
  • It normally functions in cell-wall peptidoglycan synthesis via an LPXTG motif.
  • This enzyme catalyzes a specific transpeptidation reaction.

Purpose of the Study:

  • To explore the application of sortase transpeptidase activity for in vitro protein ligation.
  • To investigate the specificity and versatility of sortase-mediated conjugation.
  • To establish a robust and easy method for protein conjugation.

Main Methods:

  • Utilizing sortase (SrtA) enzyme for in vitro ligation reactions.
  • Employing proteins/peptides with an LPXTG motif as substrates.
  • Using aminoglycine-containing proteins/peptides as ligation partners.
  • Conjugating various substrates including (d)-peptides and small molecules.

Main Results:

  • Sortase specifically ligates LPXTG-motif containing proteins/peptides to aminoglycine partners via an amide bond.
  • The enzyme successfully conjugated diverse substrates like (d)-peptides, branched peptides, and small molecules.
  • Sortase-mediated ligation demonstrated robustness, specificity, and ease of execution.
  • Successful C-terminal conjugation to recombinant proteins was achieved.

Conclusions:

  • Sortase (SrtA) is a versatile tool for in vitro protein ligation.
  • This method enables specific conjugation of unique biochemical and biophysical molecules to proteins.
  • The sortase-mediated approach offers broad applicability in protein engineering and bioconjugation.