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1pm6

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[[Image:1pm6.gif|left|200px]]
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{{STRUCTURE_1pm6| PDB=1pm6 | SCENE= }}
{{STRUCTURE_1pm6| PDB=1pm6 | SCENE= }}
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'''Solution Structure of Full-Length Excisionase (Xis) from Bacteriophage HK022'''
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===Solution Structure of Full-Length Excisionase (Xis) from Bacteriophage HK022===
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==Overview==
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Heteronuclear high-resolution NMR spectroscopy was employed to determine the solution structure of the excisionase protein (Xis) from the lambda-like bacteriophage HK022 and to study its sequence-specific DNA interaction. As wild-type Xis was previously characterized as a generally unstable protein, a biologically active HK022 Xis mutant with a single amino acid substitution Cys28--&gt;Ser was used in this work. This substitution has been shown to diminish the irreversibility of Xis denaturation and subsequent degradation, but does not affect the structural or thermodynamic properties of the protein, as evidenced by NMR and differential scanning calorimetry. The solution structure of HK022 Xis forms a compact, highly ordered protein core with two well-defined alpha-helices (residues 5-11 and 18-27) and five beta-strands (residues 2-4, 30-31, 35-36, 41-44 and 48-49). These data correlate well with 1H2O-2H2O exchange experiments and imply a different organization of the HK022 Xis secondary structure elements in comparison with the previously determined structure of the bacteriophage lambda excisionase. Superposition of both Xis structures indicates a better correspondence of the full-length HK022 Xis to the typical 'winged-helix' DNA-binding motif, as found, for example, in the DNA-binding domain of the Mu-phage repressor. Residues 51-72, which were not resolved in the lambda Xis, do not show any regular structure in HK022 Xis and thus appear to be completely disordered in solution. The resonance assignments have shown, however, that an unusual connectivity exists between residues Asn66 and Gly67 owing to asparagine-isoaspartyl isomerization. Such an isomerization has been previously observed and characterized only in eukaryotic proteins.
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{{ABSTRACT_PUBMED_14653811}}
==About this Structure==
==About this Structure==
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1PM6 is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Enterobacteria_phage_hk022 Enterobacteria phage hk022]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1PM6 OCA].
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1PM6 is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Enterobacteria_phage_hk022 Enterobacteria phage hk022]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1PM6 OCA].
==Reference==
==Reference==
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[[Category: Cis-trans-trans triproline]]
[[Category: Cis-trans-trans triproline]]
[[Category: Winged-helix]]
[[Category: Winged-helix]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 05:14:25 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 09:10:55 2008''

Revision as of 06:10, 29 July 2008

Image:1pm6.png

Template:STRUCTURE 1pm6

Solution Structure of Full-Length Excisionase (Xis) from Bacteriophage HK022

Template:ABSTRACT PUBMED 14653811

About this Structure

1PM6 is a Single protein structure of sequence from Enterobacteria phage hk022. Full experimental information is available from OCA.

Reference

Solution structure and stability of the full-length excisionase from bacteriophage HK022., Rogov VV, Lucke C, Muresanu L, Wienk H, Kleinhaus I, Werner K, Lohr F, Pristovsek P, Ruterjans H, Eur J Biochem. 2003 Dec;270(24):4846-58. PMID:14653811

Page seeded by OCA on Tue Jul 29 09:10:55 2008

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