1k4m: Difference between revisions
New page: left|200px<br /><applet load="1k4m" size="450" color="white" frame="true" align="right" spinBox="true" caption="1k4m, resolution 1.9Å" /> '''Crystal structure of ... |
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[[Image:1k4m.jpg|left|200px]]<br /><applet load="1k4m" size=" | [[Image:1k4m.jpg|left|200px]]<br /><applet load="1k4m" size="350" color="white" frame="true" align="right" spinBox="true" | ||
caption="1k4m, resolution 1.9Å" /> | caption="1k4m, resolution 1.9Å" /> | ||
'''Crystal structure of E.coli nicotinic acid mononucleotide adenylyltransferase complexed to deamido-NAD'''<br /> | '''Crystal structure of E.coli nicotinic acid mononucleotide adenylyltransferase complexed to deamido-NAD'''<br /> | ||
==Overview== | ==Overview== | ||
Nicotinamide/Nicotinate mononucleotide (NMN/NaMN) adenylyltransferase is | Nicotinamide/Nicotinate mononucleotide (NMN/NaMN) adenylyltransferase is an indispensable enzyme in both de novo biosynthesis and salvage of NAD+ and NADP+. In prokaryotes, it is absolutely required for cell survival, thus representing an attractive target for the development of new broad-spectrum antibacteria inhibitors. The crystal structures of E. coli NaMN adenylyltransferase (NMNAT) and its complex with deamido-NAD (NaAD) revealed that ligand binding causes large conformational changes in several loop regions around the active site. The enzyme specifically recognizes the deamidated pyridine nucleotide through interactions between nicotinate carboxylate with several protein main chain amides and a positive helix dipole. Comparison of E. coli NMNAT with those from archaeal organisms revealed extensive differences in the active site architecture, enzyme-ligand interaction mode, and bound dinucleotide conformations. The bacterial NaMN adenylyltransferase structures described here provide a foundation for structure-based design of specific inhibitors that may have therapeutic potential. | ||
==About this Structure== | ==About this Structure== | ||
1K4M is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli] with NAD and CIT as [http://en.wikipedia.org/wiki/ligands ligands]. Active as [http://en.wikipedia.org/wiki/Nicotinate-nucleotide_adenylyltransferase Nicotinate-nucleotide adenylyltransferase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.7.7.18 2.7.7.18] Full crystallographic information is available from [http:// | 1K4M is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli] with <scene name='pdbligand=NAD:'>NAD</scene> and <scene name='pdbligand=CIT:'>CIT</scene> as [http://en.wikipedia.org/wiki/ligands ligands]. Active as [http://en.wikipedia.org/wiki/Nicotinate-nucleotide_adenylyltransferase Nicotinate-nucleotide adenylyltransferase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.7.7.18 2.7.7.18] Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1K4M OCA]. | ||
==Reference== | ==Reference== | ||
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[[Category: Single protein]] | [[Category: Single protein]] | ||
[[Category: Cheek, S.]] | [[Category: Cheek, S.]] | ||
[[Category: Grishin, N | [[Category: Grishin, N V.]] | ||
[[Category: Kurnasov, O.]] | [[Category: Kurnasov, O.]] | ||
[[Category: Osterman, A.]] | [[Category: Osterman, A.]] | ||
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[[Category: nucleotidyltransferase]] | [[Category: nucleotidyltransferase]] | ||
''Page seeded by [http:// | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 13:30:11 2008'' | ||
Revision as of 14:30, 21 February 2008
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Crystal structure of E.coli nicotinic acid mononucleotide adenylyltransferase complexed to deamido-NAD
OverviewOverview
Nicotinamide/Nicotinate mononucleotide (NMN/NaMN) adenylyltransferase is an indispensable enzyme in both de novo biosynthesis and salvage of NAD+ and NADP+. In prokaryotes, it is absolutely required for cell survival, thus representing an attractive target for the development of new broad-spectrum antibacteria inhibitors. The crystal structures of E. coli NaMN adenylyltransferase (NMNAT) and its complex with deamido-NAD (NaAD) revealed that ligand binding causes large conformational changes in several loop regions around the active site. The enzyme specifically recognizes the deamidated pyridine nucleotide through interactions between nicotinate carboxylate with several protein main chain amides and a positive helix dipole. Comparison of E. coli NMNAT with those from archaeal organisms revealed extensive differences in the active site architecture, enzyme-ligand interaction mode, and bound dinucleotide conformations. The bacterial NaMN adenylyltransferase structures described here provide a foundation for structure-based design of specific inhibitors that may have therapeutic potential.
About this StructureAbout this Structure
1K4M is a Single protein structure of sequence from Escherichia coli with and as ligands. Active as Nicotinate-nucleotide adenylyltransferase, with EC number 2.7.7.18 Full crystallographic information is available from OCA.
ReferenceReference
Crystal structures of E. coli nicotinate mononucleotide adenylyltransferase and its complex with deamido-NAD., Zhang H, Zhou T, Kurnasov O, Cheek S, Grishin NV, Osterman A, Structure. 2002 Jan;10(1):69-79. PMID:11796112
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