Femtomolar transition state analogue inhibitors of 5′- methylthioadenosine/S-adenosylhomocysteine nucleosidase from Escherichia coli

Vipender Singh, Gary B. Evans, Dirk H. Lenz, Jennifer M. Mason, Keith Clinch, Simon Mee, Gavin F. Painter, Peter C. Tyler, Richard H. Furneaux, Jeffrey E. Lee, P. Lynne Howell, Vern L. Schramm

Research output: Contribution to journalArticle

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Abstract

Escherichia coli 5′-methylthioadenosine/S-adenosylhomocysteine nucleosidase (MTAN) hydrolyzes its substrates to form adenine and 5-methylthioribose (MTR) or S-ribosylhomocysteine (SRH). 5′- Methylthioadenosine (MTA) is a by-product of polyamine synthesis and SRH is a precursor to the biosynthesis of one or more quorum sensing autoinducer molecules. MTAN is therefore involved in quorum sensing, recycling MTA from the polyamine pathway via adenine phosphoribosyltransferase and recycling MTR to methionine. Hydrolysis of MTA by E. coli MTAN involves a highly dissociative transition state with ribooxacarbenium ion character. Iminoribitol mimics of MTA at the transition state of MTAN were synthesized and tested as inhibitors. 5′-Methylthio-Immucillin-A (MT-ImmA) is a slow-onset tight-binding inhibitor giving a dissociation constant (Ki*) of 77 pM. Substitution of the methylthio group with a p-Cl-phenylthio group gives a more powerful inhibitor with a dissociation constant of 2 pM. DADMe-Immucillins are better inhibitors of E. coli MTAN, since they are more closely related to the highly dissociative nature of the transition state. MT-DADMe-Immucillin-A binds with a Ki* value of 2 pM. Replacing the 5′-methyl group with other hydrophobic groups gave 17 transition state analogue inhibitors with dissociation constants from 10-12 to 10-14 M. The most powerful inhibitor was 5′-p-Cl-phenylthio-DADMe-Immucillin-A (pClPhT-DABMe-ImmA) with a Ki* value of 47 fM. (47 × 10-15 M). These are among the most powerful non-covalent inhibitors reported for any enzyme, binding 9-91 million times tighter than the MTA and SAH substrates, respectively. The inhibitory potential of these transition state analogue inhibitors supports a transition state structure closely resembling a fully dissociated ribooxacarbenium ion. Powerful inhibitors of MTAN are candidates to disrupt key bacterial pathways including methylation, polyamine synthesis, methionine salvage, and quorum sensing. The accompanying article reports crystal structures of MTAN with these analogues.

Original languageEnglish (US)
Pages (from-to)18265-18273
Number of pages9
JournalJournal of Biological Chemistry
Volume280
Issue number18
DOIs
StatePublished - May 6 2005

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adenosylhomocysteine nucleosidase
Escherichia coli
Quorum Sensing
Polyamines
Recycling
Methionine
Adenine Phosphoribosyltransferase
Ions
Salvaging
Methylation
Biosynthesis
Adenine
Substrates
Byproducts
Hydrolysis
Substitution reactions
Crystal structure

ASJC Scopus subject areas

  • Biochemistry

Cite this

Femtomolar transition state analogue inhibitors of 5′- methylthioadenosine/S-adenosylhomocysteine nucleosidase from Escherichia coli. / Singh, Vipender; Evans, Gary B.; Lenz, Dirk H.; Mason, Jennifer M.; Clinch, Keith; Mee, Simon; Painter, Gavin F.; Tyler, Peter C.; Furneaux, Richard H.; Lee, Jeffrey E.; Howell, P. Lynne; Schramm, Vern L.

In: Journal of Biological Chemistry, Vol. 280, No. 18, 06.05.2005, p. 18265-18273.

Research output: Contribution to journalArticle

Singh, V, Evans, GB, Lenz, DH, Mason, JM, Clinch, K, Mee, S, Painter, GF, Tyler, PC, Furneaux, RH, Lee, JE, Howell, PL & Schramm, VL 2005, 'Femtomolar transition state analogue inhibitors of 5′- methylthioadenosine/S-adenosylhomocysteine nucleosidase from Escherichia coli', Journal of Biological Chemistry, vol. 280, no. 18, pp. 18265-18273. https://doi.org/10.1074/jbc.M414472200
Singh, Vipender ; Evans, Gary B. ; Lenz, Dirk H. ; Mason, Jennifer M. ; Clinch, Keith ; Mee, Simon ; Painter, Gavin F. ; Tyler, Peter C. ; Furneaux, Richard H. ; Lee, Jeffrey E. ; Howell, P. Lynne ; Schramm, Vern L. / Femtomolar transition state analogue inhibitors of 5′- methylthioadenosine/S-adenosylhomocysteine nucleosidase from Escherichia coli. In: Journal of Biological Chemistry. 2005 ; Vol. 280, No. 18. pp. 18265-18273.
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T1 - Femtomolar transition state analogue inhibitors of 5′- methylthioadenosine/S-adenosylhomocysteine nucleosidase from Escherichia coli

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AU - Evans, Gary B.

AU - Lenz, Dirk H.

AU - Mason, Jennifer M.

AU - Clinch, Keith

AU - Mee, Simon

AU - Painter, Gavin F.

AU - Tyler, Peter C.

AU - Furneaux, Richard H.

AU - Lee, Jeffrey E.

AU - Howell, P. Lynne

AU - Schramm, Vern L.

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N2 - Escherichia coli 5′-methylthioadenosine/S-adenosylhomocysteine nucleosidase (MTAN) hydrolyzes its substrates to form adenine and 5-methylthioribose (MTR) or S-ribosylhomocysteine (SRH). 5′- Methylthioadenosine (MTA) is a by-product of polyamine synthesis and SRH is a precursor to the biosynthesis of one or more quorum sensing autoinducer molecules. MTAN is therefore involved in quorum sensing, recycling MTA from the polyamine pathway via adenine phosphoribosyltransferase and recycling MTR to methionine. Hydrolysis of MTA by E. coli MTAN involves a highly dissociative transition state with ribooxacarbenium ion character. Iminoribitol mimics of MTA at the transition state of MTAN were synthesized and tested as inhibitors. 5′-Methylthio-Immucillin-A (MT-ImmA) is a slow-onset tight-binding inhibitor giving a dissociation constant (Ki*) of 77 pM. Substitution of the methylthio group with a p-Cl-phenylthio group gives a more powerful inhibitor with a dissociation constant of 2 pM. DADMe-Immucillins are better inhibitors of E. coli MTAN, since they are more closely related to the highly dissociative nature of the transition state. MT-DADMe-Immucillin-A binds with a Ki* value of 2 pM. Replacing the 5′-methyl group with other hydrophobic groups gave 17 transition state analogue inhibitors with dissociation constants from 10-12 to 10-14 M. The most powerful inhibitor was 5′-p-Cl-phenylthio-DADMe-Immucillin-A (pClPhT-DABMe-ImmA) with a Ki* value of 47 fM. (47 × 10-15 M). These are among the most powerful non-covalent inhibitors reported for any enzyme, binding 9-91 million times tighter than the MTA and SAH substrates, respectively. The inhibitory potential of these transition state analogue inhibitors supports a transition state structure closely resembling a fully dissociated ribooxacarbenium ion. Powerful inhibitors of MTAN are candidates to disrupt key bacterial pathways including methylation, polyamine synthesis, methionine salvage, and quorum sensing. The accompanying article reports crystal structures of MTAN with these analogues.

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