Fab Fragment
Fab Fragment — The antigen-binding fragment of an antibody, used in peptide research as a smaller, monovalent alternative to full antibodies for binding studies.
What Is a Fab Fragment?
A Fab (fragment antigen-binding) is the antigen-binding portion of an antibody, generated by pepsin or papain digestion. Fabs (~50 kDa) retain monovalent binding specificity without the Fc effector domain. In peptide research, anti-peptide Fabs are used as crystallization chaperones and as smaller alternatives to full antibodies in assays.
Applications
- Co-crystallization: Fab-peptide complexes crystallize more readily than peptide alone
- Biosensors: Fab fragments immobilized on SPR chips for peptide binding measurement
- Therapeutics: PEGylated Fab (certolizumab) combines binding specificity with extended half-life
Frequently Asked Questions
What is Fab Fragment?
The antigen-binding fragment of an antibody, used in peptide research as a smaller, monovalent alternative to full antibodies for binding studies.
Why is Fab Fragment important in peptide research?
Fab Fragment is a fundamental concept in biology as it relates to peptide science. It directly influences experimental design, compound characterization, and the reliability of research outcomes across biochemistry and molecular biology disciplines.