HOMOLOGOUS CYSTEINE PROTEINASES OF PATHOGENIC AND NONPATHOGENIC ENTAMOEBA-HISTOLYTICA - DIFFERENCES IN STRUCTURE AND EXPRESSION

Autor(en): TANNICH, E
SCHOLZE, H
NICKEL, R
HORSTMANN, RD
Stichwörter: ACID; Biochemistry & Molecular Biology; CDNA; CLONING; CULTIVATION; DIFFERENTIATION; ELECTROPHORESIS; GENES; PROBES; PURIFICATION; SEQUENCES
Erscheinungsdatum: 1991
Herausgeber: AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC
Journal: JOURNAL OF BIOLOGICAL CHEMISTRY
Volumen: 266
Ausgabe: 8
Startseite: 4798
Seitenende: 4803
Zusammenfassung: 
A cDNA clone derived from the gene encoding a cysteine proteinase of pathogenic Entamoeba histolytica was isolated using an antiserum to the purified enzyme. This clone was used to identify the homologous clone in a cDNA library from nonpathogenic E. histolytica. Sequence analysis and comparison of the predicted amino acid sequences revealed a sequence divergence of 16%. Southern blot analyses indicated that (i) pathogenic isolates may contain more genes coding for these or related enzymes than nonpathogenic isolates, (ii) the structure and organization of these genes are conserved within each group of amoebae, and (iii) none of the genes is found in both pathogenic and nonpathogenic E. histolytica, underlining the notion that the two groups are genetically distinct. Northern blot analyses suggested that the cysteine proteinase is expressed by pathogenic isolates in substantially higher amounts than by nonpathogenic isolates. Overexpression of this enzyme may be an important factor in the pathogenicity of E. histolytica.
ISSN: 00219258

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