Electrofocusing analysis of DNA polymerase beta in hypophysectomized rat testis

Horm Metab Res. 1990 Apr;22(4):229-31. doi: 10.1055/s-2007-1004890.


Isoelectric focusing studies indicated that three peaks of DNA polymerase beta (beta-enzyme) activity were focused at isoelectric point of 7.1, 8.2 and 9.1 in testes of sham-operated rats, whereas in testes of hypophysectomized rats only two peaks of the beta-enzyme activity appeared at pH 7.1 and 9.1 and the peak at pH 8.2 was reconstituted by the treatment of gonadotropins and testosterone. In the brain hypophysectomy did not affect the activities of isoelectrically different beta-enzymes. These facts imply that under in vivo conditions the beta-enzymes in testes focused at different isoelectric points are modified with unknown factors and the beta-enzyme focused at pH 8.2 is affected by pituitary hormones.

MeSH terms

  • Animals
  • DNA Polymerase I / metabolism*
  • Hypophysectomy*
  • Isoelectric Focusing*
  • Isoelectric Point
  • Male
  • Rats
  • Rats, Inbred Strains
  • Testis / enzymology*


  • DNA Polymerase I