Structural Insights into Mycobacterium tuberculosis Rv2671 Protein as a Dihydrofolate Reductase Functional Analogue Contributing to para -Aminosalicylic Acid Resistance
Abstract
Mycobacterium tuberculosis (Mtb) Rv2671 is annotated as a 5-amino-6-ribitylamino-2,4(1H,3H)-pyrimidinedione 5'-phosphate (AROPP) reductase (RibD) in the riboflavin biosynthetic pathway. Recently, a strain of Mtb with a mutation in the 5' untranslated region of Rv2671, which resulted in its overexpression, was found to be resistant to dihydrofolate reductase (DHFR) inhibitors including the anti-Mtb drug para-aminosalicylic acid (PAS). In this study, a biochemical analysis of Rv2671 showed that it was able to catalyze the reduction of dihydrofolate (DHF) to tetrahydrofolate (THF), which explained why the overexpression of Rv2671 was sufficient to confer PAS resistance. We solved the structure of Rv2671 in complex with the NADP+ and tetrahydrofolate (THF), which revealed the structural basis for the DHFR activity. Furthermore, the structures of Rv2671 complexed with two DHFR inhibitors, trimethoprim and trimetrexate, provided additional details of the substrate binding pocket and elucidated the differences between their inhibitory activities. Finally, Rv2671 was unable to catalyze the reduction of AROPP, which indicated that Rv2671 and its closely related orthologues are not involved in riboflavin biosynthesis.
- Authors:
-
- Texas A & M Univ., College Station, TX (United States)
- Publication Date:
- Research Org.:
- Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
- Sponsoring Org.:
- National Institutes of Health (NIH); R.J. Wolfe-Welch Foundation
- OSTI Identifier:
- 1241061
- Grant/Contract Number:
- P01AI095208; A-0015
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Biochemistry
- Additional Journal Information:
- Journal Volume: 55; Journal Issue: 7; Journal ID: ISSN 0006-2960
- Publisher:
- American Chemical Society (ACS)
- Country of Publication:
- United States
- Language:
- ENGLISH
- Subject:
- 59 BASIC BIOLOGICAL SCIENCES; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Peptides and proteins; Pyrimidine; Chemical structure; Inhibitors; Noncovalent interactions
Citation Formats
Cheng, Yu-Shan, and Sacchettini, James C. Structural Insights into Mycobacterium tuberculosis Rv2671 Protein as a Dihydrofolate Reductase Functional Analogue Contributing to para -Aminosalicylic Acid Resistance. United States: N. p., 2016.
Web. doi:10.1021/acs.biochem.5b00993.
Cheng, Yu-Shan, & Sacchettini, James C. Structural Insights into Mycobacterium tuberculosis Rv2671 Protein as a Dihydrofolate Reductase Functional Analogue Contributing to para -Aminosalicylic Acid Resistance. United States. https://doi.org/10.1021/acs.biochem.5b00993
Cheng, Yu-Shan, and Sacchettini, James C. Fri .
"Structural Insights into Mycobacterium tuberculosis Rv2671 Protein as a Dihydrofolate Reductase Functional Analogue Contributing to para -Aminosalicylic Acid Resistance". United States. https://doi.org/10.1021/acs.biochem.5b00993. https://www.osti.gov/servlets/purl/1241061.
@article{osti_1241061,
title = {Structural Insights into Mycobacterium tuberculosis Rv2671 Protein as a Dihydrofolate Reductase Functional Analogue Contributing to para -Aminosalicylic Acid Resistance},
author = {Cheng, Yu-Shan and Sacchettini, James C.},
abstractNote = {Mycobacterium tuberculosis (Mtb) Rv2671 is annotated as a 5-amino-6-ribitylamino-2,4(1H,3H)-pyrimidinedione 5'-phosphate (AROPP) reductase (RibD) in the riboflavin biosynthetic pathway. Recently, a strain of Mtb with a mutation in the 5' untranslated region of Rv2671, which resulted in its overexpression, was found to be resistant to dihydrofolate reductase (DHFR) inhibitors including the anti-Mtb drug para-aminosalicylic acid (PAS). In this study, a biochemical analysis of Rv2671 showed that it was able to catalyze the reduction of dihydrofolate (DHF) to tetrahydrofolate (THF), which explained why the overexpression of Rv2671 was sufficient to confer PAS resistance. We solved the structure of Rv2671 in complex with the NADP+ and tetrahydrofolate (THF), which revealed the structural basis for the DHFR activity. Furthermore, the structures of Rv2671 complexed with two DHFR inhibitors, trimethoprim and trimetrexate, provided additional details of the substrate binding pocket and elucidated the differences between their inhibitory activities. Finally, Rv2671 was unable to catalyze the reduction of AROPP, which indicated that Rv2671 and its closely related orthologues are not involved in riboflavin biosynthesis.},
doi = {10.1021/acs.biochem.5b00993},
journal = {Biochemistry},
number = 7,
volume = 55,
place = {United States},
year = {Fri Feb 05 00:00:00 EST 2016},
month = {Fri Feb 05 00:00:00 EST 2016}
}
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