Campus Access Only
All rights reserved. This publication is intended for use solely by faculty, students, and staff of University of the Pacific. No part of this publication may be reproduced, distributed, or transmitted in any form or by any means, now known or later developed, including but not limited to photocopying, recording, or other electronic or mechanical methods, without the prior written permission of the author or the publisher.
Date of Award
Thesis - Pacific Access Restricted
Master of Science (M.S.)
First Committee Member
Second Committee Member
The Role of TvTrxR in Drug Resistance and Characterization of TvRad51 in Homologous Recombination in Trichomonas vaginalis Abstract By Melissa Hopper University of the Pacific 2016 In recent years, prevalence of metronidazole-resistant cases of Trichomonas vaginalis has been on the rise. With nearly 10% of strains resistant to metronidazole, new treatments to combat this parasite have become a necessity. FDA-approved drug screens have identified the compound, auranofin, as an effective agent against similar protozoans. The mechanism of inhibition by auranofin has been found to proceed through inhibition of the thioredoxin-based anti-oxidant pathway, targeting the enzyme thioredoxin reductase (TrxR). In this study, auranofin was found to be an effective inhibitor of T. vaginalis TrxR activity. Auranofin was also found to be an effective inhibitor of several trichomonad strains in culture, exhibiting IC50 values comparable to metronidazole. These studies indicate that auranofin is a promising agent for treatment of trichomoniasis. Another aspect of T. vaginalis biology addressed in this study is the ability of T. vaginalis to carry out homologous recombination (HR), a process used to repair double-stranded breaks in DNA. The protein radiation sensitive protein 51 (Rad51) plays a crucial role in the process of HR in mitotic and meiotic recombination. In this study, experiments were carried out to elucidate the role of T. vaginalis Rad51 in homologous recombination. TvRad51 was found to exhibit nuclear localization and was capable of carrying out ATP hydrolysis. Rad51 was shown to be up-regulated at the protein level in T. vaginalis in response to treatment with DNA-damaging agents. In addition, TvRad51 was capable of binding the BRC repeat region of TvBRCA2. These results indicate that T. vaginalis upregulates expression of Rad51 protein in response to certain forms of DNA damage and TvRad51 may be capable of carrying out HR mediated by different binding partners.
Hopper, Melissa. (2016). The role of TvTrxR in drug resistance and characterization of TvRad51 in homologous recombination in Trichomonas vaginalis. University of the Pacific, Thesis - Pacific Access Restricted. https://scholarlycommons.pacific.edu/uop_etds/169
To access this thesis/dissertation you must have a valid pacific.edu email address and log-in to Scholarly Commons.Find in ProQuest
If you are the author and would like to grant permission to make your work openly accessible, please email