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1o6x

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{{STRUCTURE_1o6x| PDB=1o6x | SCENE= }}
{{STRUCTURE_1o6x| PDB=1o6x | SCENE= }}
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'''NMR SOLUTION STRUCTURE OF THE ACTIVATION DOMAIN OF HUMAN PROCARBOXYPEPTIDASE A2'''
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===NMR SOLUTION STRUCTURE OF THE ACTIVATION DOMAIN OF HUMAN PROCARBOXYPEPTIDASE A2===
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==Overview==
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The activation domain of human procarboxypeptidase A2, ADA2h, is an 81-residue globular domain released during the proteolytic activation of the proenzyme. The role of this and other similar domains as assistants of the correct folding of the enzyme is not fully understood. The folding pathway of ADA2h was characterized previously, and it was also observed that under certain conditions it may convert into amyloid fibrils in vitro. To gain insight into these processes, a detailed description of its three-dimensional structure in aqueous solution is required so that eventual changes could be properly monitored. A complete assignment of the (1)H and (15)N resonances of ADA2h was performed, and the solution structure, as derived from a set of 1688 nonredundant constraints, is very well defined (pairwise backbone RMSD = 0.67 +/- 0.17 A for residues 10-80). The structure is composed of two antiparallel alpha-helices comprising residues 19-32 and 58-69 packed on the same side of a three-stranded beta-sheet spanning residues 10-15, 50-55, and 73-75. The global fold for the isolated human A2 activation domain is very similar to that of porcine carboxypeptidase B, as well as to the structure of the domain in the crystal of the intact human proenzyme. The observed structural differences relative to the intact human proenzyme are located at the interface between the activation domain and the enzyme and can be related with the activation mechanism. The backbone amide proton exchange behavior of ADA2h was also examined. The global free energy of unfolding obtained from exchange data of the most protected amide protons at pH 7.0 and 298K is 4.9 +/- 0.3 kcal.mole(-1), in good agreement with the values determined by thermal or denaturant unfolding studies.
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{{ABSTRACT_PUBMED_12538893}}
==About this Structure==
==About this Structure==
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1O6X is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1O6X OCA].
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1O6X is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1O6X OCA].
==Reference==
==Reference==
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[[Category: Hydrolase]]
[[Category: Hydrolase]]
[[Category: Metalloprote]]
[[Category: Metalloprote]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 03:27:37 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 02:28:30 2008''

Revision as of 23:28, 28 July 2008

Image:1o6x.png

Template:STRUCTURE 1o6x

NMR SOLUTION STRUCTURE OF THE ACTIVATION DOMAIN OF HUMAN PROCARBOXYPEPTIDASE A2

Template:ABSTRACT PUBMED 12538893

About this Structure

1O6X is a Single protein structure of sequence from Homo sapiens. Full experimental information is available from OCA.

Reference

NMR solution structure of the activation domain of human procarboxypeptidase A2., Jimenez MA, Villegas V, Santoro J, Serrano L, Vendrell J, Aviles FX, Rico M, Protein Sci. 2003 Feb;12(2):296-305. PMID:12538893

Page seeded by OCA on Tue Jul 29 02:28:30 2008

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