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| | {{STRUCTURE_2gn0| PDB=2gn0 | SCENE= }} | | {{STRUCTURE_2gn0| PDB=2gn0 | SCENE= }} |
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| - | '''Crystal structure of dimeric biodegradative threonine deaminase (TdcB) from Salmonella typhimurium at 1.7 A resolution (Triclinic form with one complete subunit built in alternate conformation)'''
| + | ===Crystal structure of dimeric biodegradative threonine deaminase (TdcB) from Salmonella typhimurium at 1.7 A resolution (Triclinic form with one complete subunit built in alternate conformation)=== |
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| - | ==Overview==
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| - | Two different pyridoxal 5'-phosphate-containing l-threonine deaminases (EC 4.3.1.19), biosynthetic and biodegradative, which catalyze the deamination of l-threonine to alpha-ketobutyrate, are present in Escherichia coli and Salmonella typhimurium. Biodegradative threonine deaminase (TdcB) catalyzes the first reaction in the anaerobic breakdown of l-threonine to propionate. TdcB, unlike the biosynthetic threonine deaminase, is insensitive to l-isoleucine and is activated by AMP. In the present study, TdcB from S. typhimurium was cloned and overexpressed in E. coli. In the presence of AMP or CMP, the recombinant enzyme was converted to the tetrameric form accompanied by significant enzyme activation. To provide insights into ligand-mediated oligomerization and enzyme activation, crystal structures of S. typhimurium TdcB and its complex with CMP were determined. In the native structure, TdcB is in a dimeric form, whereas in the TdcB.CMP complex, it exists in a tetrameric form with 222 symmetry and appears as a dimer of dimers. Tetrameric TdcB binds to four molecules of CMP, two at each of the dimer interfaces. Comparison of the dimer structure in the ligand (CMP)-free and -bound forms suggests that the changes induced by ligand binding at the dimer interface are essential for tetramerization. The differences observed in the tertiary and quaternary structures of TdcB in the absence and presence of CMP appear to account for enzyme activation and increased binding affinity for l-threonine. Comparison of TdcB with related pyridoxal 5'-phosphate-dependent enzymes points to structural and mechanistic similarities.
| + | The line below this paragraph, {{ABSTRACT_PUBMED_17046821}}, adds the Publication Abstract to the page |
| | + | (as it appears on PubMed at http://www.pubmed.gov), where 17046821 is the PubMed ID number. |
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| | ==About this Structure== | | ==About this Structure== |
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| | [[Category: Plp,threonine dehydratase]] | | [[Category: Plp,threonine dehydratase]] |
| | [[Category: Tdcb]] | | [[Category: Tdcb]] |
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 05:17:27 2008'' | + | |
| | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Jul 10 12:36:39 2008'' |
Revision as of 09:36, 10 July 2008
Template:STRUCTURE 2gn0
Crystal structure of dimeric biodegradative threonine deaminase (TdcB) from Salmonella typhimurium at 1.7 A resolution (Triclinic form with one complete subunit built in alternate conformation)
Template:ABSTRACT PUBMED 17046821
About this Structure
2GN0 is a Single protein structure of sequence from Salmonella typhimurium. Full crystallographic information is available from OCA.
Reference
Crystal structures of Salmonella typhimurium biodegradative threonine deaminase and its complex with CMP provide structural insights into ligand-induced oligomerization and enzyme activation., Simanshu DK, Savithri HS, Murthy MR, J Biol Chem. 2006 Dec 22;281(51):39630-41. Epub 2006 Oct 17. PMID:17046821
Page seeded by OCA on Thu Jul 10 12:36:39 2008
