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Updated: Oct 10, 2025
Peptide-based Identification of Functional Motifs and their Binding Partners
Published on: June 30, 2013
Overcome Chemoresistance: Biophysical and Structural Analysis of Synthetic FHIT-Derived Peptides
Maria Carmina Scala1, Simone Di Micco2, Delia Lanzillotta3
1Department of Pharmacy, University of Salerno, Fisciano, Italy.
Abstract:
The fragile histidine triad (FHIT) protein is a member of the large and ubiquitous histidine triad (HIT) family of proteins. On the basis of genetic evidence, it has been postulated that the FHIT protein may function as tumor suppressor, implying a role for the FHIT protein in carcinogenesis. Recently, Gaudio et al. reported that FHIT binds and delocalizes annexin A4 (ANXA4) from plasma membrane to cytosol in paclitaxel-resistant lung cancer cells, thus restoring their chemosensitivity to the drug. They also identified the smallest protein sequence of the FHIT still interacting with ANXA4, ranging from position 7 to 13: QHLIKPS. This short sequence of FHIT protein was not only able to bind ANXA4 but also to hold its target in the cytosol during paclitaxel treatment, thus avoiding ANXA4 translocation to the inner side of the cell membrane. Starting from these results, to obtain much information about structure requirements involved in the interaction of the peptide mentioned above, we synthetized a panel of seven peptides through an Ala-scan approach. In detail, to study the binding of FHIT derived peptides with ANXA4, we applied a combination of different biophysical techniques such as differential scanning fluorimetry (DSF), surface plasmon resonance (SPR), and microscale thermophoresis (MST). Circular dichroism (CD) and nuclear magnetic resonance (NMR) were used to determine the conformational structure of the lead peptide (7-13) and peptides generated from ala-scan technique. The application of different biophysical and structural techniques, integrated by a preliminary biological evaluation, allowed us to build a solid structure activity relationship on the synthesized peptides.
Insights
The fragile histidine triad (FHIT) protein peptide QHLIKPS binds annexin A4 (ANXA4), restoring chemosensitivity in paclitaxel-resistant lung cancer cells. Structure-activity relationship studies reveal key interactions for potential cancer therapy.
Area of Science:
- Biochemistry
- Molecular Biology
- Cancer Research
Background:
- The fragile histidine triad (FHIT) protein is implicated as a tumor suppressor in carcinogenesis.
- FHIT protein interaction with annexin A4 (ANXA4) is crucial for restoring chemosensitivity in paclitaxel-resistant lung cancer cells.
- A minimal FHIT peptide (QHLIKPS, residues 7-13) was identified that binds ANXA4 and prevents its translocation.
Purpose of the Study:
- To investigate the structural requirements for the interaction between the FHIT peptide (QHLIKPS) and ANXA4.
- To establish a structure-activity relationship for FHIT-derived peptides targeting ANXA4.
- To explore the potential of FHIT peptides in overcoming paclitaxel resistance in lung cancer.
Main Methods:
- Synthesis of seven peptides using an Ala-scan approach based on the FHIT (7-13) sequence.
- Biophysical techniques including differential scanning fluorimetry (DSF), surface plasmon resonance (SPR), and microscale thermophoresis (MST) to study peptide-ANXA4 binding.
- Structural analyses using circular dichroism (CD) and nuclear magnetic resonance (NMR) to determine peptide conformation.
Main Results:
- A panel of FHIT-derived peptides was synthesized and characterized for their interaction with ANXA4.
- Biophysical and structural methods elucidated the binding kinetics and conformational aspects of the FHIT-ANXA4 interaction.
- A robust structure-activity relationship was established for the synthesized peptides, highlighting key residues for ANXA4 binding and localization.
Conclusions:
- The FHIT peptide QHLIKPS and its analogs can effectively bind ANXA4 and influence its cellular localization.
- Understanding the structure-activity relationship of these peptides provides a basis for designing novel therapeutic strategies against paclitaxel-resistant lung cancer.
- These findings contribute to the development of targeted therapies by elucidating FHIT-ANXA4 interactions in cancer cells.
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