Complexes of Thermotoga maritima S-adenosylmethionine decarboxylase provide insights into substrate specificity

Shridhar Bale, Kavita Baba, Diane E. McCloskey, Anthony E. Pegg, Steven E. Ealick

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The polyamines putrescine, spermidine and spermine are ubiquitous aliphatic cations and are essential for cellular growth and differentiation. S-Adenosylmethionine decarboxylase (AdoMetDC) is a critical pyruvoyl-dependent enzyme in the polyamine-biosynthetic pathway. The crystal structures of AdoMetDC from humans and plants and of the AdoMetDC proenzyme from Thermotoga maritima have been obtained previously. Here, the crystal structures of activated T. maritima AdoMetDC (TmAdoMetDC) and of its complexes with S - adenosylmethionine methyl ester and 5′-deoxy-5′-dimethyl-thioadenosine are reported. The results demonstrate for the first time that TmAdoMetDC autoprocesses without the need for additional factors and that the enzyme contains two complete active sites, both of which use residues from both chains of the homodimer. The complexes provide insights into the substrate specificity and ligand binding of AdoMetDC in prokaryotes. The conservation of the ligand-binding mode and the active-site residues between human and T. maritima AdoMetDC provides insight into the evolution of AdoMetDC.

Original languageEnglish (US)
Pages (from-to)181-189
Number of pages9
JournalActa Crystallographica Section D: Biological Crystallography
Volume66
Issue number2
DOIs
StatePublished - Feb 17 2010

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Adenosylmethionine Decarboxylase
Thermotoga maritima
Substrate Specificity
Polyamines
Catalytic Domain
Ligands
S-Adenosylmethionine
Enzyme Precursors
Putrescine
Spermidine
Spermine
Biosynthetic Pathways
Enzymes
Cations
Esters

All Science Journal Classification (ASJC) codes

  • Structural Biology

Cite this

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title = "Complexes of Thermotoga maritima S-adenosylmethionine decarboxylase provide insights into substrate specificity",
abstract = "The polyamines putrescine, spermidine and spermine are ubiquitous aliphatic cations and are essential for cellular growth and differentiation. S-Adenosylmethionine decarboxylase (AdoMetDC) is a critical pyruvoyl-dependent enzyme in the polyamine-biosynthetic pathway. The crystal structures of AdoMetDC from humans and plants and of the AdoMetDC proenzyme from Thermotoga maritima have been obtained previously. Here, the crystal structures of activated T. maritima AdoMetDC (TmAdoMetDC) and of its complexes with S - adenosylmethionine methyl ester and 5′-deoxy-5′-dimethyl-thioadenosine are reported. The results demonstrate for the first time that TmAdoMetDC autoprocesses without the need for additional factors and that the enzyme contains two complete active sites, both of which use residues from both chains of the homodimer. The complexes provide insights into the substrate specificity and ligand binding of AdoMetDC in prokaryotes. The conservation of the ligand-binding mode and the active-site residues between human and T. maritima AdoMetDC provides insight into the evolution of AdoMetDC.",
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Complexes of Thermotoga maritima S-adenosylmethionine decarboxylase provide insights into substrate specificity. / Bale, Shridhar; Baba, Kavita; McCloskey, Diane E.; Pegg, Anthony E.; Ealick, Steven E.

In: Acta Crystallographica Section D: Biological Crystallography, Vol. 66, No. 2, 17.02.2010, p. 181-189.

Research output: Contribution to journalArticle

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