Abstract
Dipeptidyl peptidase IV (DPP-IV) is an ectopeptidase with many roles, and a target of therapies for different pathologies. Zinc and calcium produce mixed inhibition of porcine DPP-IV activity. To investigate whether these results may be generalized to mammalian DPP-IV orthologues, we purified the intact membrane-bound form from rat kidney. Rat DPP-IV hydrolysed Gly-Pro-p-nitroanilide with an average Vmax of 0.86±0.01 μmol min–1mL–1 and KM of 76±6 μM. The enzyme was inhibited by the DPP-IV family inhibitor l-threo-Ile-thiazolidide (Ki=64.0±0.53 nM), competitively inhibited by bacitracin (Ki=0.16±0.01 mM) and bestatin (Ki=0.23±0.02 mM), and irreversibly inhibited by TLCK (IC50 value of 1.20±0.11 mM). The enzyme was also inhibited by divalent ions like Zn2+ and Ca2+, for which a mixed inhibition mechanism was observed (Ki values of the competitive component: 0.15±0.01 mM and 50.0±1.05 mM, respectively). According to bioinformatic tools, Ca2+ ions preferentially bound to the β-propeller domain of the rat and human enzymes, while Zn2+ ions to the α-β hydrolase domain; the binding sites were essentially the same that were previously reported for the porcine DPP-IV. These data suggest that the cationic susceptibility of mammalian DPP-IV orthologues involves conserved mechanisms.
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Abbreviations
- aas:
-
amino acids
- APA:
-
glutamyl aminopeptidase
- APB:
-
arginyl aminopeptidase
- APN:
-
alanyl aminopeptidase
- BSA:
-
bovine serum albumin
- DPP-IV:
-
dipeptidyl peptidase IV
- GIP:
-
gastric inhibitory peptide
- GLP-1:
-
glucagon-like peptide 1
- NEM:
-
N-ethyl maleimide
- P32/98:
-
l-threo-Ile-thiazolidide
- pNA:
-
p-nitroanilide
- TLCK:
-
tosyl-l-lysine chloromethyl ketone
- Xaa:
-
any common amino acids
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Acknowledgements
This work was funded by grants from the International Foundation for Science (IFS) and the Organization for the Prohibition of Chemical Weapons (OPCW) (F/3276-3), CONACYT-Mexico (61804), CONACYT-Mexico-Cuba-CITMA (2009-2011), and OPCW Internship 2010 to IP.
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Corresponding editor: MARÍA LUZ CÁRDENAS
MS received 16 January 2013; accepted 08 April 2013
Corresponding editor: María Luz Cárdenas
[Gómez H, Chappé M, Valiente P, Pons T, Chávez MLA, Charli J-L and Pascual I 2013 Effect of zinc and calcium ions on the rat kidney membrane-bound form of dipeptidyl peptidase IV. J. Biosci. 38 1–9] DOI 10.1007/s12038-013-9333-8
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Gómez, H., Chappé, M., Valiente, P.A. et al. Effect of zinc and calcium ions on the rat kidney membrane-bound form of dipeptidyl peptidase IV. J Biosci 38, 461–469 (2013). https://doi.org/10.1007/s12038-013-9333-8
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DOI: https://doi.org/10.1007/s12038-013-9333-8