ORBi: Houbrechts Annick - Second-generation octarellins: two new de novo (beta/alpha)8 polypeptides designed for investigating the influence of beta-residue packing on the alpha/beta-barrel structure stability

Reference : Second-generation octarellins: two new de novo (beta/alpha)8 polypeptides designed for i...


	Document type :	Scientific journals : Article
	Discipline(s) :	Life sciences : Biochemistry, biophysics & molecular biology
	To cite this reference:	http://hdl.handle.net/2268/19843

Title :	Second-generation octarellins: two new de novo (beta/alpha)8 polypeptides designed for investigating the influence of beta-residue packing on the alpha/beta-barrel structure stability
Language :	English
Author, co-author :	Houbrechts, Annick [Université de Liège - ULg > > Interface Entreprises-Université >]
	Moreau, Benoît [Université de Liège - ULg > > > >]
	Abagyan, Ruben [Université de Liège - ULg > > > >]
	Mainfroid, Véronique [Université de Liège - ULg > > > >]
	Preaux, Gisèle [Katholieke Universiteit Leuven - KUL > > > >]
	Lamproye, Alain [Eurogentec > > > >]
	Poncin, Alain [Eurogentec > > > >]
	Goormaghtigh, Erik [Université Libre de Bruxelles - ULB > > > >]
	Ruysschaert, Jean-Marie [Université Libre de Bruxelles - ULB > > > >]
	Martial, Joseph [Université de Liège - ULg > Département des sciences de la vie > GIGA-R : Biologie et génétique moléculaire >]
	Goraj, Karine [Université de Liège - ULg > > > >]
Publication date :	1995
Journal title :	Protein Engineering
Publisher :	Oxford University Press
Volume :	8
Issue/season :	3
Pages :	249-59
Peer reviewed :	Yes (verified by ORBi)
ISSN :	0269-2139
e-ISSN :	1460-213X
City :	Oxford
Country :	United Kingdom
Keywords :	[en] Amino Acid Sequence ; Bacterial Proteins/chemistry ; Base Sequence ; Chromatography, Gel ; Circular Dichroism ; Electrophoresis, Polyacrylamide Gel ; Escherichia coli/genetics ; Fungal Proteins/chemistry ; Genes, Synthetic ; Molecular Sequence Data ; Peptides/genetics ; Protein Denaturation ; Protein Engineering/methods ; Protein Structure, Secondary ; Protozoan Proteins/chemistry ; Recombinant Proteins/chemistry/genetics ; Solubility ; Spectroscopy, Fourier Transform Infrared ; Ultracentrifugation ; Urea/pharmacology
Abstract :	[en] The sequence of octarellin I, the first de novo (beta/alpha)8 polypeptide, was revised according to several criteria, among others the symmetry of the sequence, beta-residue volume and hydrophobicity, and charge distribution. These considerations and the overall conclusions drawn from the first design led to two new sequences, corresponding to octarellins II and III. Octarellin II retains perfect 8-fold symmetry. Octarellin III has the same sequence as octarellin II, except for the beta-strands which exhibit a 4-fold symmetry. The two proteins were produced in Escherichia coli. Infrared and CD spectral analyses of octarellins II and III reveal a high secondary structure content. Non-denaturing gel electrophoresis, molecular sieve chromatography and analytical ultracentrifugation suggest that both of these second-generation artificial polypeptides exist as a mixture of a monomer and a dimer form. Octarellins II and III are at least 10 times more soluble than octarellin I. Urea-induced unfolding followed by fluorescence emission suggests that the tryptophan residues, designed to be buried in the (beta/alpha)8, are indeed packed in the hydrophobic core of both proteins. However, octarellin III displays a higher stability towards urea denaturation, indicating that introducing 4-fold symmetry into the beta-barrel might be important for stability of the overall folding.
Permalink :	http://hdl.handle.net/2268/19843
Other URL :	http://peds.oxfordjournals.org/cgi/content/abstract/8/3/249
Mentions required by the publisher for OA :	1995/03/01

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