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Title: The crystal structure of Escherichia coli spermidine synthase SpeE reveals a unique substrate-binding pocket
Authors: Zhou, X. 
Chua, T.K. 
Tkaczuk, K.L.
Bujnicki, J.M.
Sivaraman, J. 
Keywords: Aminopropyltransferase
Crystal structure
Polyamine synthase
Rossmann fold
Spermidine synthase
Issue Date: Mar-2010
Citation: Zhou, X., Chua, T.K., Tkaczuk, K.L., Bujnicki, J.M., Sivaraman, J. (2010-03). The crystal structure of Escherichia coli spermidine synthase SpeE reveals a unique substrate-binding pocket. Journal of Structural Biology 169 (3) : 277-285. ScholarBank@NUS Repository.
Abstract: Polyamines are essential in all branches of life. Biosynthesis of spermidine, one of the most ubiquitous polyamines, is catalyzed by spermidine synthase (SpeE). Although the function of this enzyme from Escherichia coli has been thoroughly characterised, its structural details remain unknown. Here, we report the crystal structure of E. coli SpeE and study its interaction with the ligands by isothermal titration calorimetry and computational modelling. SpeE consists of two domains - a small N-terminal β-strand domain, and a C-terminal catalytic domain that adopts a canonical methyltransferase (MTase) Rossmann fold. The protein forms a dimer in the crystal and in solution. Structural comparison of E. coli SpeE to its homologs reveals that it has a large and unique substrate-binding cleft that may account for its lower amine substrate specificity. © 2009 Elsevier Inc. All rights reserved.
Source Title: Journal of Structural Biology
ISSN: 10478477
DOI: 10.1016/j.jsb.2009.12.024
Appears in Collections:Staff Publications

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