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Dipeptidyl peptidase 8 and 9--guilty by association?
Melissa R Pitman1, Melanie L Sulda, Bryone Kuss
1School of Biological Sciences, Flinders University, GPO BOX 2100, Adelaide 5001, South Australia, Australia. Melissa.pitman@flinders.edu.au
Frontiers in Bioscience (Landmark Edition)
|March 11, 2009
Summary
Dipeptidyl peptidases (DP) 8 and 9 are DPIV family enzymes with unknown functions. While implicated in immunity and diseases like cancer and diabetes, direct evidence linking DP8/9 to human illness is still lacking.
Area of Science:
- Enzymology
- Molecular Biology
- Immunology
Background:
- Dipeptidyl peptidases (DP) 8 and 9 belong to the dipeptidyl peptidase IV (DPIV) enzyme family, which includes enzymes with established roles in various diseases.
- Other DPIV family members like DPIV and fibroblast activation protein (FAP) are implicated in conditions such as diabetes, cancer, and inflammatory diseases.
- Despite high sequence similarity to other active DPs, the specific biological functions of DP8 and DP9 remain largely uncharacterized.
Purpose of the Study:
- To explore the potential biological roles of Dipeptidyl peptidases (DP) 8 and 9.
- To investigate the predicted functions of DP8 and DP9 based on their structural similarities to other DPIV family members.
- To review the evidence for DP8/9 involvement in immune responses and human diseases.
Main Methods:
- Bioinformatic analysis of DP8 and DP9 sequences.
- Comparison of active site similarities within the DPIV enzyme family.
- Literature review of studies implicating DP8/9 in biological processes and diseases.
Main Results:
- DP8 and DP9 share significant sequence homology with other DPIV family enzymes, particularly in their active sites.
- Evidence suggests a potential role for DP8 and/or DP9 in both innate and acquired immunity.
- Direct causal links between DP8/9 and specific human diseases have not yet been definitively established.
Conclusions:
- DP8 and DP9 are DPIV family members with predicted enzymatic activity and potential roles in immunity.
- Further research is required to elucidate the precise functions of DP8 and DP9 and confirm their direct involvement in human diseases.
- Currently, the association of DP8/9 with diseases is based on indirect evidence and sequence homology.
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