Molecular and functional properties of the psychrophilic elongation factor G from the Antarctic Eubacterium Pseudoalteromonas haloplanktis TAC 125
The molecular and functional properties of the elongation factor (EF) G from the psychrophilic Antarctic eubacterium Pseudoalteromonas haloplanktis (Ph) were studied. PhEF-G catalyzed protein synthesis in vitro that was inhibited by fusidic acid, an antibiotic specifically acting on EF-G. The EF int...
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ftuninapoliparth:oai:ricerca.uniparthenope.it:11367/28356 2024-04-14T08:03:04+00:00 Molecular and functional properties of the psychrophilic elongation factor G from the Antarctic Eubacterium Pseudoalteromonas haloplanktis TAC 125 RUGGIERO I RAIMO G PALMA M ARCARI P MASULLO, Mariorosario Ruggiero, I Raimo, G Palma, M Arcari, P Masullo, Mariorosario 2007 http://hdl.handle.net/11367/28356 https://doi.org/10.1007/s00792-007-0088-8 eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000249119300007 volume:11 firstpage:699 lastpage:709 numberofpages:11 journal:EXTREMOPHILES http://hdl.handle.net/11367/28356 doi:10.1007/s00792-007-0088-8 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-34548304992 info:eu-repo/semantics/closedAccess Elongation factor G Psychrophilic Pseudoalteromonas haloplanktis GTPase Heat stability info:eu-repo/semantics/article 2007 ftuninapoliparth https://doi.org/10.1007/s00792-007-0088-8 2024-03-21T17:55:42Z The molecular and functional properties of the elongation factor (EF) G from the psychrophilic Antarctic eubacterium Pseudoalteromonas haloplanktis (Ph) were studied. PhEF-G catalyzed protein synthesis in vitro that was inhibited by fusidic acid, an antibiotic specifically acting on EF-G. The EF interacted with GDP only in the presence of P. haloplanktis ribosome and fusidic acid with an affinity similar to that displayed by Escherichia coli EF-G. The psychrophilic translocase elicited a ribosome-dependent GTPase that was competitively inhibited by GDP, the slowly hydrolyzable GTP analog GppNHp, and the protein synthesis inhibitor ppGDP. The temperature dependence of the activity of PhEF-G reached its maximum at least 26 degrees C beyond the growth temperature of P. haloplanktis (4-20 degrees C). The heat inactivation profile of the ribosome-dependent GTPase of PhEF-G gave a temperature for half inactivation (46 degrees C), significantly lower than that for half denaturation measured by either UV- (57 degrees C) or fluorescence-melting (62 degrees C). This finding was attributed to a different effect of the temperature on the catalytic domain with respect to that elicited on the other domains constituting the EF, thus confirming the differential molecular flexibility present in psychrophilic enzymes. A molecular model, based on the 3D coordinates of a thermophilic EF-G, showed differences only in connecting loops. Article in Journal/Newspaper Antarc* Antarctic Università degli Studi di Napoli "Parthenope": CINECA IRIS Antarctic The Antarctic Tac ENVELOPE(-59.517,-59.517,-62.500,-62.500) Extremophiles 11 5 699 709 |
institution |
Open Polar |
collection |
Università degli Studi di Napoli "Parthenope": CINECA IRIS |
op_collection_id |
ftuninapoliparth |
language |
English |
topic |
Elongation factor G Psychrophilic Pseudoalteromonas haloplanktis GTPase Heat stability |
spellingShingle |
Elongation factor G Psychrophilic Pseudoalteromonas haloplanktis GTPase Heat stability RUGGIERO I RAIMO G PALMA M ARCARI P MASULLO, Mariorosario Molecular and functional properties of the psychrophilic elongation factor G from the Antarctic Eubacterium Pseudoalteromonas haloplanktis TAC 125 |
topic_facet |
Elongation factor G Psychrophilic Pseudoalteromonas haloplanktis GTPase Heat stability |
description |
The molecular and functional properties of the elongation factor (EF) G from the psychrophilic Antarctic eubacterium Pseudoalteromonas haloplanktis (Ph) were studied. PhEF-G catalyzed protein synthesis in vitro that was inhibited by fusidic acid, an antibiotic specifically acting on EF-G. The EF interacted with GDP only in the presence of P. haloplanktis ribosome and fusidic acid with an affinity similar to that displayed by Escherichia coli EF-G. The psychrophilic translocase elicited a ribosome-dependent GTPase that was competitively inhibited by GDP, the slowly hydrolyzable GTP analog GppNHp, and the protein synthesis inhibitor ppGDP. The temperature dependence of the activity of PhEF-G reached its maximum at least 26 degrees C beyond the growth temperature of P. haloplanktis (4-20 degrees C). The heat inactivation profile of the ribosome-dependent GTPase of PhEF-G gave a temperature for half inactivation (46 degrees C), significantly lower than that for half denaturation measured by either UV- (57 degrees C) or fluorescence-melting (62 degrees C). This finding was attributed to a different effect of the temperature on the catalytic domain with respect to that elicited on the other domains constituting the EF, thus confirming the differential molecular flexibility present in psychrophilic enzymes. A molecular model, based on the 3D coordinates of a thermophilic EF-G, showed differences only in connecting loops. |
author2 |
Ruggiero, I Raimo, G Palma, M Arcari, P Masullo, Mariorosario |
format |
Article in Journal/Newspaper |
author |
RUGGIERO I RAIMO G PALMA M ARCARI P MASULLO, Mariorosario |
author_facet |
RUGGIERO I RAIMO G PALMA M ARCARI P MASULLO, Mariorosario |
author_sort |
RUGGIERO I |
title |
Molecular and functional properties of the psychrophilic elongation factor G from the Antarctic Eubacterium Pseudoalteromonas haloplanktis TAC 125 |
title_short |
Molecular and functional properties of the psychrophilic elongation factor G from the Antarctic Eubacterium Pseudoalteromonas haloplanktis TAC 125 |
title_full |
Molecular and functional properties of the psychrophilic elongation factor G from the Antarctic Eubacterium Pseudoalteromonas haloplanktis TAC 125 |
title_fullStr |
Molecular and functional properties of the psychrophilic elongation factor G from the Antarctic Eubacterium Pseudoalteromonas haloplanktis TAC 125 |
title_full_unstemmed |
Molecular and functional properties of the psychrophilic elongation factor G from the Antarctic Eubacterium Pseudoalteromonas haloplanktis TAC 125 |
title_sort |
molecular and functional properties of the psychrophilic elongation factor g from the antarctic eubacterium pseudoalteromonas haloplanktis tac 125 |
publishDate |
2007 |
url |
http://hdl.handle.net/11367/28356 https://doi.org/10.1007/s00792-007-0088-8 |
long_lat |
ENVELOPE(-59.517,-59.517,-62.500,-62.500) |
geographic |
Antarctic The Antarctic Tac |
geographic_facet |
Antarctic The Antarctic Tac |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000249119300007 volume:11 firstpage:699 lastpage:709 numberofpages:11 journal:EXTREMOPHILES http://hdl.handle.net/11367/28356 doi:10.1007/s00792-007-0088-8 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-34548304992 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1007/s00792-007-0088-8 |
container_title |
Extremophiles |
container_volume |
11 |
container_issue |
5 |
container_start_page |
699 |
op_container_end_page |
709 |
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1796298049482391552 |