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Titolo:
AMINO-ACID-TRANSPORT SYSTEMS REQUIRED FOR DIAZOTROPHIC GROWTH IN THE CYANOBACTERIUM ANABAENA SP STRAIN PCC-7120
Autore:
MONTESINOS ML; HERRERO A; FLORES E;
Indirizzi:
UNIV SEVILLA,CSIC,INST BIOQUIM VEGETAL & FOTOSINTESIS,APARTADO 1113 E-41080 SEVILLE SPAIN UNIV SEVILLA,CSIC,INST BIOQUIM VEGETAL & FOTOSINTESIS E-41080 SEVILLESPAIN
Titolo Testata:
Journal of bacteriology
fascicolo: 11, volume: 177, anno: 1995,
pagine: 3150 - 3157
SICI:
0021-9193(1995)177:11<3150:ASRFDG>2.0.ZU;2-W
Fonte:
ISI
Lingua:
ENG
Soggetto:
N-13-LABELED NITROGEN GAS; BLUE-GREEN-ALGA; HETEROCYSTS; CYLINDRICA; GLUTAMINE; DINITROGEN; FIXATION; MEMBRANE; MUTANTS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
38
Recensione:
Indirizzi per estratti:
Citazione:
M.L. Montesinos et al., "AMINO-ACID-TRANSPORT SYSTEMS REQUIRED FOR DIAZOTROPHIC GROWTH IN THE CYANOBACTERIUM ANABAENA SP STRAIN PCC-7120", Journal of bacteriology, 177(11), 1995, pp. 3150-3157

Abstract

Uptake of 16 amino acids by the filamentous, heterocyst-forming cyanobacterium Anabaena sp. strain PCC 7120 was characterized with regard to kinetic parameters of transport, intracellular accumulation of the transported amino acids, and sensitivity of the transport process to energy metabolism inhibitors. Mutants resistant to certain toxic analogsof some amino acids were isolated that were impaired in amino acid transport. Results obtained in this study together with those reported previously (A. Herrero and E. Flores, J. Biol. Chem. 265:3931-3935, 1990), suggest that there are at least five amino acid transport systems in strain PCC 7120: one high-affinity, active system for basic amino acids; one low-affinity, passive system for basic amino acids; two high-affinity, active systems with overlapping, but not identical, specificities for neutral amino acids; and one putative system for acidic amino acids. Some of the amino acid transport mutants were impaired in diazotrophic growth. These mutants were unable to develop a normal percentage of heterocysts and normal nitrogenase activity in response to nitrogen stepdown. Putative roles for the amino acid transport systems in uptake of extracellular amino acids, recapture of amino acids that have leaked from the cells, and intercellular transfer of amino acids in the filaments of Anabaena sp. strain PCC 7120 are discussed.

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Documento generato il 11/07/20 alle ore 04:26:58