1kqp: Difference between revisions

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[[Image:1kqp.gif|left|200px]]
{{Seed}}
[[Image:1kqp.png|left|200px]]


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{{STRUCTURE_1kqp|  PDB=1kqp  |  SCENE=  }}  
{{STRUCTURE_1kqp|  PDB=1kqp  |  SCENE=  }}  


'''NH3-DEPENDENT NAD+ SYNTHETASE FROM BACILLUS SUBTILIS AT 1 A RESOLUTION'''
===NH3-DEPENDENT NAD+ SYNTHETASE FROM BACILLUS SUBTILIS AT 1 A RESOLUTION===




==Overview==
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The final step of NAD+ biosynthesis includes an amide transfer to nicotinic acid adenine dinucleotide (NaAD) catalyzed by NAD+ synthetase. This enzyme was co-crystallized in microgravity with natural substrates NaAD and ATP at pH 8.5. The crystal was exposed to ammonium ions, synchrotron diffraction data were collected and the atomic model was refined anisotropically at 1 A resolution to R = 11.63%. Both binding sites are occupied by the NAD-adenylate intermediate, pyrophosphate and two magnesium ions. The atomic resolution of the structure allows better definition of non-planar peptide groups, reveals a low mean anisotropy of protein and substrate atoms and indicates the H-atom positions of the phosphoester group of the reaction intermediate. The phosphoester group is protonated at the carbonyl O atom O7N, suggesting a carbenium-ion structure stabilized by interactions with two solvent sites presumably occupied by ammonia and a water molecule. A mechanism is proposed for the second catalytic step, which includes a nucleophilic attack by the ammonia molecule on the intermediate.
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{{ABSTRACT_PUBMED_12077433}}


==About this Structure==
==About this Structure==
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[[Category: Ligase]]
[[Category: Ligase]]
[[Category: Nad-adenylate]]
[[Category: Nad-adenylate]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Wed Jul 2 10:47:37 2008''

Revision as of 07:47, 2 July 2008

File:1kqp.png

Template:STRUCTURE 1kqp

NH3-DEPENDENT NAD+ SYNTHETASE FROM BACILLUS SUBTILIS AT 1 A RESOLUTION

Template:ABSTRACT PUBMED 12077433

About this Structure

1KQP is a Single protein structure of sequence from Bacillus subtilis. Full crystallographic information is available from OCA.

Reference

NH3-dependent NAD+ synthetase from Bacillus subtilis at 1 A resolution., Symersky J, Devedjiev Y, Moore K, Brouillette C, DeLucas L, Acta Crystallogr D Biol Crystallogr. 2002 Jul;58(Pt 7):1138-46. Epub 2002, Jun 20. PMID:12077433

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