-
Qingliang Yang,
Yi Li,
Dengfeng Dou,
Xiangdong Gan,
Swathi Mohan,
Christopher S Groutas,
Laura E Stevenson,
Zhong Lai,
Kevin R Alliston, Jiaying Zhong,
Todd D Williams,
William C Groutas
[show abstract]
[hide abstract]
ABSTRACT: A new class of carbamylating agents based on the cyclosulfamide scaffold is reported. These compounds were found to be efficient time-dependent inhibitors of human neutrophil elastase (HNE). Exploitation of the three sites of diversity present in the cyclosulfamide scaffold yielded compounds which inhibited HNE but not proteinase 3 (PR 3) or bovine trypsin. The findings reported herein suggest that the introduction of appropriate recognition elements into the cyclosulfamide scaffold may lead to highly selective agents of potential value in the design of activity-based probes suitable for investigating proteases associated with the pathogenesis of chronic obstructive pulmonary disease.
Archives of Biochemistry and Biophysics 08/2008; 475(2):115-20. · 2.93 Impact Factor
-
[show abstract]
[hide abstract]
ABSTRACT: The pathogenesis of a range of human diseases arises from the aberrant activity of proteolytic enzymes. Agents capable of selectively modulating the activity of these enzymes are of potential therapeutic value. Thus, there is a continuing need for the design of scaffolds that can be used in the development of new classes of protease inhibitors. We describe herein the serendipitous discovery of an unexpected rearrangement that leads to the formation of two novel templates that can be used in the design of protease inhibitors.
Bioorganic & Medicinal Chemistry 01/2005; 12(23):6249-54. · 2.92 Impact Factor
-
[show abstract]
[hide abstract]
ABSTRACT: We describe herein the design and in vitro biochemical evaluation of a novel class of mechanism-based inhibitors of human leukocyte elastase (HLE) that inactivate the enzyme via an unprecedented enzyme-induced sulfonamide fragmentation cascade. The inhibitors incorporate in their structure an appropriately functionalized saccharin scaffold. Furthermore, the inactivation of the enzyme by these inhibitors was found to be time-dependent and to involve the active site. Biochemical, HPLC, and mass spectrometric studies show that the interaction of these inhibitors with HLE results in the formation of a stable acyl complex and is accompanied by the release of (L) phenylalanine methyl ester. The data are consistent with initial formation of a Michaelis-Menten complex and subsequent formation of a tetrahedral intermediate with the active site serine (Ser(195)). Collapse of the tetrahedral intermediate with tandem fragmentation results in the formation of a highly reactive conjugated sulfonyl imine which can either react with water to form a stable acyl enzyme and/or undergo a Michael addition reaction with an active site nucleophilic residue (His(57)). It is also demonstrated herein that this class of compounds can be used in the design of inhibitors of serine proteases having either a neutral or basic primary substrate specificity. Thus, the results suggest that these inhibitors constitute a potential general class of mechanism-based inhibitors of (chymo)trypsin-like serine proteases.
Archives of Biochemistry and Biophysics 10/2004; 429(1):60-70. · 2.93 Impact Factor
-
[show abstract]
[hide abstract]
ABSTRACT: The design of novel functionalized templates capable of binding to the active site of serine proteases could potentially lead to the development of potent and highly selective non-covalent inhibitors of these enzymes. Using the elastase-turkey ovomucoid inhibitor complex and insights gained from earlier work based on the 1,2,5-thiadiazolidin-3-one 1,1 dioxide scaffold (I), a surrogate cyclosulfamide scaffold (II) was used for the first time in the design of reversible inhibitors of human leukocyte elastase. Compounds 7 and 8 were found to be micromolar reversible inhibitors of the enzyme.
Bioorganic & Medicinal Chemistry 03/2004; 12(3):589-93. · 2.92 Impact Factor
-
[show abstract]
[hide abstract]
ABSTRACT: A wide range of human diseases are associated with the aberrant activity of mammalian, viral, bacterial or parasitic proteases. These include members of all four classes of proteases, namely, serine, cysteine, aspartic and metallo- proteases. The involvement of proteases in disease states has provided the impetus behind studies related to the design of potent and selective inhibitors and their use as either therapeutic agents and/or pharmacological probes to gain a better understanding of the pathophysiology of a particular disease. This review focuses on recent developments related to the design of mechanism-based and alternate substrate inhibitors of serine proteases of mammalian and non-mammalian origin. Numerous examples are cited that illustrate the fundamental principles and subtleties associated with the design of covalent and non-covalent inhibitors of these enzymes. This is an exciting and promising area of investigation that will undoubtedly continue unabated in the future.
Current Topics in Medicinal Chemistry 02/2004; 4(12):1203-16. · 4.17 Impact Factor
-
[show abstract]
[hide abstract]
ABSTRACT: A central problem associated with the design of enzyme inhibitors in general, and serine protease inhibitors in particular, is the identification of templates capable of binding to the active site of an enzyme in a predictable and substrate-like fashion, orienting appended recognition elements in a correct spatial relationship so that favorable binding interactions with multiple sites are achieved. Described herein for the first time is the design of noncovalent inhibitors of human leukocyte elastase that employs a functionalized 4-imidazolidinone scaffold.
Bioorganic & Medicinal Chemistry 12/2003; 11(23):5149-53. · 2.92 Impact Factor
-
[show abstract]
[hide abstract]
ABSTRACT: Exploratory studies related to the design and synthesis of functionalized cyclic sulfamides (I) as potential inhibitors of proteolytic enzymes were carried out. The structural motif and three diversity sites embodied in the scaffold render it amenable to combinatorial parallel synthesis and the facile generation of lead discovery prospecting libraries. The scaffold was readily assembled starting with (DL) serine methyl ester, and a series of compounds was generated and screened against human leukocyte elastase. Modification of the P(1) recognition element, believed to be accommodated at the primary specificity site (S(1) subsite) of the enzyme, yielded compounds that inhibited the enzyme by an apparent hyperbolic partial mixed-type inhibition.
Journal of Combinatorial Chemistry 6(4):556-63. · 3.41 Impact Factor
