1cm2: Difference between revisions

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[[Image:1cm2.jpg|left|200px]]
{{Seed}}
[[Image:1cm2.png|left|200px]]


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{{STRUCTURE_1cm2|  PDB=1cm2  |  SCENE=  }}  
{{STRUCTURE_1cm2|  PDB=1cm2  |  SCENE=  }}  


'''STRUCTURE OF HIS15ASP HPR AFTER HYDROLYSIS OF RINGED SPECIES.'''
===STRUCTURE OF HIS15ASP HPR AFTER HYDROLYSIS OF RINGED SPECIES.===




==Overview==
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The active site residue, His(15), in histidine-containing protein, HPr, can be replaced by aspartate and still act as a phosphoacceptor and phosphodonor with enzyme I and enzyme IIA(glucose), respectively. Other substitutions, including cysteine, glutamate, serine, threonine, and tyrosine, failed to show any activity. Enzyme I K(m) for His(15) --&gt; Asp HPr is increased 10-fold and V(max) is decreased 1000-fold compared with wild type HPr. The phosphorylation of Asp(15) led to a spontaneous internal rearrangement involving the loss of the phosphoryl group and a water molecule, which was confirmed by mass spectrometry. The protein species formed had a higher pI than His(15) --&gt; Asp HPr, which could arise from the formation of a succinimide or an isoimide. Hydrolysis of the isolated high pI form gave only aspartic acid at residue 15, and no isoaspartic acid was detected. This indicates that an isoimide rather than a succinimide is formed. In the absence of phosphorylation, no formation of the high pI form could be found, indicating that phosphorylation catalyzed the formation of the cyclization. The possible involvement of Asn(12) in an internal cyclization with Asp(15) was eliminated by the Asn(12) --&gt; Ala mutation in His(15) --&gt; AspHPr. Asn(12) substitutions of alanine, aspartate, serine, and threonine in wild type HPr indicated a general requirement for residues capable of forming a hydrogen bond with the Nepsilon(2) atom of His(15), but elimination of the hydrogen bond has only a 4-fold decrease in k(cat)/K(m).
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{{ABSTRACT_PUBMED_10419492}}


==About this Structure==
==About this Structure==
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[[Category: Phosphotransferase]]
[[Category: Phosphotransferase]]
[[Category: Succinimide]]
[[Category: Succinimide]]
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May  2 12:52:53 2008''
 
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jun 30 20:56:06 2008''

Revision as of 17:56, 30 June 2008

File:1cm2.png

Template:STRUCTURE 1cm2

STRUCTURE OF HIS15ASP HPR AFTER HYDROLYSIS OF RINGED SPECIES.

Template:ABSTRACT PUBMED 10419492

About this Structure

1CM2 is a Single protein structure of sequence from Escherichia coli. Full crystallographic information is available from OCA.

Reference

The aspartyl replacement of the active site histidine in histidine-containing protein, HPr, of the Escherichia coli Phosphoenolpyruvate:Sugar phosphotransferase system can accept and donate a phosphoryl group. Spontaneous dephosphorylation of acyl-phosphate autocatalyzes an internal cyclization., Napper S, Delbaere LT, Waygood EB, J Biol Chem. 1999 Jul 30;274(31):21776-82. PMID:10419492

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