Abstract:
:The isocitrate lyase from a thermophilic Bacillus is activated about threefold by a variety of salts. Such strong stimulation of activity is not seen with isocitrate lyase from the mesophiles, Bacillus licheniformis, Bacillus megaterium, Escherichia coli, and Aspergillus nidulans. The salt activation is markedly pH-dependent. At pH values above 8.6, salt (KCl) indeed inhibits the enzyme activity. Potassium chloride also causes a significant shift of the pH optimum of the enzyme towards the acid side. As the temperature of the enzyme reaction is raised, activation becomes progressively weaker. Potassium chloride also affords considerable protection against enzyme denaturation at 55 C. The activation and the stabilization, however, appear to be independent effects. Of six other enzymes in the thermophile that were examined, isocitrate dehydrogenase was equally strongly activated by KCl and malate synthase was less strongly, but significantly, activated; citrate synthase, malate dehydrogenase, glutamate dehydrogenase, and lactate dehydrogenase were unaffected or slightly inhibited by KCl. The property of being strongly activated by salt appears to be a peculiar characteristic of the thermophile isocitrate lyase and possibly evolved concomitantly with its thermostability.
journal_name
J Bacterioljournal_title
Journal of bacteriologyauthors
Griffiths MW,Sundaram TKdoi
10.1128/JB.116.3.1160-1169.1973subject
Has Abstractpub_date
1973-12-01 00:00:00pages
1160-9issue
3eissn
0021-9193issn
1098-5530journal_volume
116pub_type
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journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/JB.01080-06
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journal_title:Journal of bacteriology
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doi:10.1128/JB.00276-11
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journal_title:Journal of bacteriology
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doi:10.1128/JB.130.2.946-947.1977
更新日期:1977-05-01 00:00:00
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pub_type: 杂志文章
doi:10.1128/JB.94.3.571-575.1967
更新日期:1967-09-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
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pub_type: 杂志文章
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更新日期:1997-11-01 00:00:00
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更新日期:2008-11-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/JB.188.9.3424-3428.2006
更新日期:2006-05-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/jb.174.1.222-232.1992
更新日期:1992-01-01 00:00:00
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更新日期:2008-11-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/JB.158.3.820-825.1984
更新日期:1984-06-01 00:00:00
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pub_type: 杂志文章
doi:10.1128/JB.97.1.416-425.1969
更新日期:1969-01-01 00:00:00
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pub_type: 杂志文章
doi:10.1128/JB.111.3.641-648.1972
更新日期:1972-09-01 00:00:00
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pub_type: 杂志文章
doi:10.1128/jb.170.11.5325-5329.1988
更新日期:1988-11-01 00:00:00
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pub_type: 杂志文章
doi:10.1128/JB.145.1.479-488.1981
更新日期:1981-01-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/jb.178.1.156-162.1996
更新日期:1996-01-01 00:00:00
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pub_type: 杂志文章
doi:10.1128/JB.187.9.3133-3138.2005
更新日期:2005-05-01 00:00:00
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doi:10.1128/jb.169.12.5633-5640.1987
更新日期:1987-12-01 00:00:00
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更新日期:1963-02-01 00:00:00
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更新日期:2004-10-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/JB.00290-09
更新日期:2009-06-01 00:00:00
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pub_type: 杂志文章
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更新日期:1990-12-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/JB.84.6.1228-1236.1962
更新日期:1962-12-01 00:00:00
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更新日期:1998-03-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
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更新日期:1971-08-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
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更新日期:1976-05-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/JB.00290-12
更新日期:2012-08-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/JB.91.6.2146-2154.1966
更新日期:1966-06-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
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更新日期:2007-02-01 00:00:00