Abstract
Dimethylarginine dimethylaminohydrolase (DDAH) is a key enzyme involved in the metabolism of asymmetric dimethylarginine (ADMA) and N-monomethyl arginine (NMMA), which are endogenous inhibitors of the nitric oxide synthase (NOS) family of enzymes. Two isoforms of DDAH have been identified in humans, DDAH-1 and DDAH-2. DDAH-1 inhibition represents a promising strategy to limit the overproduction of NO in pathological states without affecting the homeostatic role of this important messenger molecule. Here we describe the design and synthesis of 12 novel DDAH-1 inhibitors and report their derived kinetic parameters, IC50 and Ki. Arginine analogue 10a, characterized by an acylsulfonamide isosteric replacement of the carboxylate, showed a 13-fold greater inhibitory potential relative to the known DDAH-1 inhibitor, L-257. Compound 10a was utilized to study the putative binding interactions of human DDAH-1 inhibition using molecular dynamics simulations. The latter suggests that several stabilizing interactions occur in the DDAH-1 active-site, providing structural insights for the enhanced inhibitory potential demonstrated by in vitro inhibition studies.
Original language | English |
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Pages (from-to) | 11315-11330 |
Number of pages | 16 |
Journal | Organic & Biomolecular Chemistry |
Volume | 46 |
Issue number | 13 |
Early online date | 23 Sept 2015 |
DOIs | |
Publication status | Published - 14 Dec 2015 |
Bibliographical note
AcknowledgementsThe authors thank eResearch SA for computational time and
data storage facility. PCN acknowledges Flinders University for
Research Fellowship. The authors would also like to thank Prof. John O. Miners for his helpful suggestions and the opportunity to use the facilities at the Department of Clinical Pharmacology at Flinders University, Dr Andrew Rowland for his help in the development of the hDDAH-1 activity assay and Rhys Murphy for his help in conducting the polarimetry experiments. We thank Prof. James Leiper (MRC Clinical Sciences Centre, London, UK) for a sample of L-257.
We thank also the EPSRC National Mass Spectrometry Service Centre (Swansea, UK), for performing HRMS analyses.
Keywords
- DDAH-1
- Arginine analogues
- Carboxylate bioisostetric functions
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Sergio Dall'Angelo
- School of Medicine, Medical Sciences & Nutrition, Medical Imaging Technologies
- School of Medicine, Medical Sciences & Nutrition, Aberdeen Cardiovascular and Diabetes Centre
- School of Medicine, Medical Sciences & Nutrition, Medical Sciences - Research Fellow
- School of Medicine, Medical Sciences & Nutrition, Institute of Medical Sciences
- School of Medicine, Medical Sciences & Nutrition, Aberdeen Biomedical Imaging Centre
Person: Academic Related - Research