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1ce3

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{{STRUCTURE_1ce3| PDB=1ce3 | SCENE= }}
{{STRUCTURE_1ce3| PDB=1ce3 | SCENE= }}
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'''PUTATIVE ANCESTRAL PROTEIN ENCODED BY A SINGLE SEQUENCE REPEAT OF THE MULTIDOMAIN PROTEINASE INHIBITOR FROM NICOTIANA ALATA'''
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===PUTATIVE ANCESTRAL PROTEIN ENCODED BY A SINGLE SEQUENCE REPEAT OF THE MULTIDOMAIN PROTEINASE INHIBITOR FROM NICOTIANA ALATA===
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==Overview==
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BACKGROUND: The ornamental tobacco Nicotiana alata produces a series of proteinase inhibitors (PIs) that are derived from a 43 kDa precursor protein, NaProPI. NaProPI contains six highly homologous repeats that fold to generate six separate structural domains, each corresponding to one of the native PIs. An unusual feature of NaProPI is that the structural domains lie across adjacent repeats and that the sixth PI domain is generated from fragments of the first and sixth repeats. Although the homology of the repeats suggests that they may have arisen from gene duplication, the observed folding does not appear to support this. This study of the solution structure of a single NaProPI repeat (aPI1) forms a basis for unravelling the mechanism by which this protein may have evolved. RESULTS: The three-dimensional structure of aPI1 closely resembles the triple-stranded antiparallel beta sheet observed in each of the native PIs. The five-residue sequence Glu-Glu-Lys-Lys-Asn, which forms the linker between the six structural domains in NaProPI, exists as a disordered loop in aPI1. The presence of this loop in aPI1 results in a loss of the characteristically flat and disc-like topography of the native inhibitors. CONCLUSIONS: A single repeat from NaProPI is capable of folding into a compact globular domain that displays native-like PI activity. Consequently, it is possible that a similar single-domain inhibitor represents the ancestral protein from which NaProPI evolved.
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{{ABSTRACT_PUBMED_10425681}}
==About this Structure==
==About this Structure==
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1CE3 is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Nicotiana_alata Nicotiana alata]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1CE3 OCA].
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1CE3 is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Nicotiana_alata Nicotiana alata]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1CE3 OCA].
==Reference==
==Reference==
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[[Category: Nicotiana alata]]
[[Category: Nicotiana alata]]
[[Category: Protease inhibitor]]
[[Category: Protease inhibitor]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 12:37:37 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jun 30 20:36:59 2008''

Revision as of 17:37, 30 June 2008

Image:1ce3.png

Template:STRUCTURE 1ce3

PUTATIVE ANCESTRAL PROTEIN ENCODED BY A SINGLE SEQUENCE REPEAT OF THE MULTIDOMAIN PROTEINASE INHIBITOR FROM NICOTIANA ALATA

Template:ABSTRACT PUBMED 10425681

About this Structure

1CE3 is a Single protein structure of sequence from Nicotiana alata. Full experimental information is available from OCA.

Reference

Structure of a putative ancestral protein encoded by a single sequence repeat from a multidomain proteinase inhibitor gene from Nicotiana alata., Scanlon MJ, Lee MC, Anderson MA, Craik DJ, Structure. 1999 Jul 15;7(7):793-802. PMID:10425681

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