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Effect of zinc and calcium ions on the rat kidney membrane-bound form of dipeptidyl peptidase IV

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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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Correspondence to Isel Pascual.

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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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