Evidence For Specific And Non-Covalent Binding Of Lipids To Natural And Recombinant Mycobacterium Bovis Bcg Hsp60 Proteins, And To The Escherichia Coli Homologue Groel

De Bruyn, J.; Soetaert, K.; Buyssens, P.; Calonne, I.; De Coene, Jl.; Gallet, X.; Brasseur, Robert; Wattiez, R.; Falmagne, P.; Montrozier, H.; Laneelle, Ma.; Daffe, M.

doi:10.1099/00221287-146-7-1513

Article (Scientific journals)

Evidence For Specific And Non-Covalent Binding Of Lipids To Natural And Recombinant Mycobacterium Bovis Bcg Hsp60 Proteins, And To The Escherichia Coli Homologue Groel

De Bruyn, J.; Soetaert, K.; Buyssens, P. et al.

2000 • In Microbiology, 146, p. 1513-1524

Peer Reviewed verified by ORBi

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https://hdl.handle.net/2268/63666

DOI
10.1099/00221287-146-7-1513

PubMed
10878116

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Abstract :

[en] Heat-shock proteins (Hsps) from various origins are known to share a conserved structure and are assumed to be key partners in the biogenesis of proteins. Fractionation of the mycobacterial Hsp60, a 65 kDa protein also called Cpn60, from Mycobacterium bovis BCG zinc-deficient culture filtrate on phenyl-Sepharose followed by Western blotting revealed the existence of four Hsp60-1 and Hsp60-2 forms, based on their hydrophobicity behaviour. Hsp60-2 species were further purified by ion-exchange chromatography and partial amino acid sequences of cyanogen bromide (CNBr) peptides of purified Hsp60-2 species showed identity with the amino acid sequence deduced from the hsp60-2 gene, indicating that the various Hsp60-2 forms are encoded by the same gene. In addition, the mycobacterial Hsp60-2 was overexpressed in E. coli using the pRR3Hsp60-2 plasmid and analysed on phenyl-Sepharose. The elution pattern of the recombinant Hsp60-2, as well as that of Escherichia coli GroEL, was similar to that of the native Hsp60-2 from the culture filtrate of M. bovis BCG and entirely different from that of the mycobacterial antigen 85. Extraction of mycobacterial Hsp60-2 forms, recombinant BCG Hsp60-2 and E. coli GroEL with organic solvents releases various amounts of non-covalently bound lipids. The presence of lipids on Hsp60-2 was confirmed by labelling M. bovis BCG with radioactive palmitate. The radioactivity was specifically associated with Hsp60 in the aqueous phase and the 19 and 38 kDa lipoproteins in the Triton X-114 phase. Analysis of the lipids extracted from purified Hsp60-2, recombinant BCG Hsp60-2 and E. coli GroEL by TLC showed the same pattern for all the samples. Acid methanolysis of the lipids followed by GC analysis led to the identification of C(16:0), C(18:0) and C(18:1) as the major fatty acyl constituents, and of methylglycoside in these proteins. Altogether, these data demonstrate that lipids are non-covalently bound to Hsp60-2 and homologous proteins.

Disciplines :

Biochemistry, biophysics & molecular biology

Author, co-author :

De Bruyn, J.

Soetaert, K.

Buyssens, P.

Calonne, I.

De Coene, Jl.

Gallet, X.

Brasseur, Robert ; Université de Liège - ULiège > Gembloux Agro-Bio Tech

Wattiez, R.

Falmagne, P.

Montrozier, H.

Laneelle, Ma.

Daffe, M.

Language :

English

Title :

Evidence For Specific And Non-Covalent Binding Of Lipids To Natural And Recombinant Mycobacterium Bovis Bcg Hsp60 Proteins, And To The Escherichia Coli Homologue Groel

Publication date :

2000

Journal title :

Microbiology

ISSN :

1350-0872

eISSN :

1465-2080

Publisher :

Society for General Microbiology, United Kingdom

Volume :

146

Pages :

1513-1524
1513-24

Peer reviewed :

Peer Reviewed verified by ORBi

Available on ORBi :

since 25 June 2010

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