The presence of a high-K<inf>m</inf> hexokinase activity in dog, but not in boar, sperm

Josep M. Fernández-Novell, Joan Ballester, Antonio Medrano, Pedro J. Otaegui, Teresa Rigau, Joan J. Guinovart, Joan E. Rodríguez-Gil

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18 Citations (Scopus)

Abstract

The presence of a high-Km hexokinase activity was tested in both dog and boar spermatozoa. Hexokinase kinetics from dog extracts showed the presence of a specific activity (dog-sperm glucokinase-like protein, DSGLP), in the range of glucose concentrations of 4-10 mM, whereas boar sperm did not show any DSGLP activity. Furthermore, dog-sperm cells, but not those of boar, showed the presence of a protein which specifically reacted against a rat-liver anti-glucokinase antibody. This protein also had a molecular weight equal to that observed in rat-liver extracts, suggesting a close similarity between both the proteins. This glucokinase-like protein was distributed in the peri- and post-acrosomal zones of the head, and the midpiece and principal piece of tail of dog spermatozoa. These results indicate that dog spermatozoa have functional high-Km hexokinase activity, which could contribute to a very fine regulation of their hexose metabolism. This strict regulation could ultimately be very important in optimizing dog-sperm function along its life-time. © 2004 Federation of European Biochemical Societies. Published by Elsevier B.V. All rights reserved.
Original languageEnglish
Pages (from-to)211-216
JournalFEBS Letters
Volume570
DOIs
Publication statusPublished - 16 Jul 2004

Keywords

  • DSGLP, dog-sperm glucokinase-like protein
  • Dog-sperm
  • Glucokinase-regulatory protein
  • High-K hexokinase m
  • PBS, phosphate-buffered saline
  • SDS, sodium dodecyl sulfate
  • TRITC, tetramethylrhodamine isothiocyanate

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