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Titolo:
EFFECTS OF MAGNESIUM AND TEMPERATURE ON THE CONFORMATION AND REASSOCIATION OF ESCHERICHIA-COLI AND SULFOLOBUS-SOLFATARICUS RIBOSOMES
Autore:
PEDONE F; BONINCONTRO A; BRIGANTI G; GIANSANTI A; LONDEI P; RISULEO G; MENGONI M;
Indirizzi:
UNIV ROMA LA SAPIENZA,DIPARTIMENTO GENET & BIOL MOL,P A MORO 2 I-00185 ROME ITALY UNIV ROMA LA SAPIENZA,DIPARTIMENTO FIS I-00185 ROME ITALY UNIV ROMA LA SAPIENZA,DIPARTIMENTO BIOPATOL UMANA,SEZ BIOL CELLULARE I-00185 ROME ITALY UNIV BARI,FAC MED,IST BIOL GEN I-70123 BARI ITALY
Titolo Testata:
Biochimica et biophysica acta (G). General subjects
fascicolo: 3, volume: 1335, anno: 1997,
pagine: 283 - 289
SICI:
0304-4165(1997)1335:3<283:EOMATO>2.0.ZU;2-T
Fonte:
ISI
Lingua:
ENG
Soggetto:
ARCHAEBACTERIUM SULFOLOBUS; FLUORESCENCE; SUBUNITS; PROTEINS;
Keywords:
RIBOSOME; THERMOPHILIC RIBOSOMAL SUBUNIT; MAGNESIUM ION; FLUORESCENCE; LIGHT SCATTERING; BOUND ETHIDIUM BROMIDE; (ESCHERICHIA-COLI); (S-SOLFATARICUS);
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
11
Recensione:
Indirizzi per estratti:
Citazione:
F. Pedone et al., "EFFECTS OF MAGNESIUM AND TEMPERATURE ON THE CONFORMATION AND REASSOCIATION OF ESCHERICHIA-COLI AND SULFOLOBUS-SOLFATARICUS RIBOSOMES", Biochimica et biophysica acta (G). General subjects, 1335(3), 1997, pp. 283-289

Abstract

The structural response of the ribosomes of the extremely thermophilic archaeon Sulfolobus solfataricus was analysed and compared to that of the mesophilic (E. coli) ribosomes by assaying ethidium bromide (EB)binding to the native 70S particles as a function of magnesium concentration. We found that the thermophilic ribosomes bound more EB than their mesophilic counterparts; on the other hand, inhibition of EB binding by Mg2+ ions was more effective in the E. coli 70S particle. In Sulfolobus, the separated 30S and 50S subunits and the 70S particle bound the drug in a similar fashion, whereas the E. coli 70S had a reducednumber of binding sites with respect to the subunits. Light scattering measurements as a function of Mg2+ concentration were carried out atvarious temperatures to study the interaction between the ribosomal subunits from the thermophilic and the mesophilic bacteria. As expected, the association of ribosomal subunits in E. coli was magnesium dependent and could be observed also at low temperature. By contrast, the interaction between Sulfolobus ribosomal subunits was obligatorily dependent upon both magnesium ions and a temperature of at least 80 degrees C, close to the physiological optimum for cell growth (87 degrees C).

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Documento generato il 30/09/20 alle ore 09:17:55