Abstract:
:The homotrimeric enzyme Mt-Cam from Methanosarcina thermophila is the archetype of the gamma class of carbonic anhydrases. A search of databases queried with Mt-Cam revealed that a majority of the homologs comprise a putative subclass (CamH) in which there is major conservation of all of the residues essential for the archetype Mt-Cam except Glu62 and an acidic loop containing the essential proton shuttle residue Glu84. The CamH homolog from M. thermophila (Mt-CamH) was overproduced in Escherichia coli and characterized to validate its activity and initiate an investigation of the CamH subclass. The Mt-CamH homotrimer purified from E. coli cultured with supplemental zinc (Zn-Mt-CamH) contained 0.71 zinc and 0.15 iron per monomer and had k(cat) and k(cat)/K(m) values that were substantially lower than those for the zinc form of Mt-Cam (Zn-Mt-Cam). Mt-CamH purified from E. coli cultured with supplemental iron (Fe-Mt-CamH) was also a trimer containing 0.15 iron per monomer and only a trace amount of zinc and had an effective k(cat) (k(cat)(eff)) value normalized for iron that was 6-fold less than that for the iron form of Mt-Cam, whereas the k(cat)/K(m)(eff) was similar to that for Fe-Mt-Cam. Addition of 50 mM imidazole to the assay buffer increased the k(cat)(eff) of Fe-Mt-CamH more than 4-fold. Fe-Mt-CamH lost activity when it was exposed to air or 3% H(2)O(2), which supports the hypothesis that Fe(2+) has a role in the active site. The k(cat) for Fe-Mt-CamH was dependent on the concentration of buffer in a way that indicates that it acts as a second substrate in a "ping-pong" mechanism accepting a proton. The k(cat)/K(m) was not dependent on the buffer, consistent with the mechanism for all carbonic anhydrases in which the interconversion of CO(2) and HCO(3)(-) is separate from intermolecular proton transfer.
journal_name
J Bacterioljournal_title
Journal of bacteriologyauthors
Zimmerman SA,Tomb JF,Ferry JGdoi
10.1128/JB.01164-09subject
Has Abstractpub_date
2010-03-01 00:00:00pages
1353-60issue
5eissn
0021-9193issn
1098-5530pii
JB.01164-09journal_volume
192pub_type
杂志文章abstract::Analysis of the deoxyribonucleic acid prepared from Proteus mirabilis, Escherichia coli, and Serratia marcescens in an alkaline CsCl gradient has shown that there is an asymmetric distribution of guanine plus thymine residues between the complementary strands of the deoxyribonucleic acid. ...
journal_title:Journal of bacteriology
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doi:10.1128/JB.106.1.238-242.1971
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journal_title:Journal of bacteriology
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pub_type: 杂志文章
doi:10.1128/JB.151.2.918-923.1982
更新日期:1982-08-01 00:00:00
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journal_title:Journal of bacteriology
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doi:10.1128/JB.103.1.49-54.1970
更新日期:1970-07-01 00:00:00
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更新日期:2001-03-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
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journal_title:Journal of bacteriology
pub_type: 杂志文章
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journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/jb.175.11.3563-3569.1993
更新日期:1993-06-01 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:2002-03-01 00:00:00
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pub_type: 杂志文章
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更新日期:2009-03-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/JB.161.1.60-71.1985
更新日期:1985-01-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
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journal_title:Journal of bacteriology
pub_type: 杂志文章
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更新日期:1984-12-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/jb.169.12.5808-5814.1987
更新日期:1987-12-01 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:2018-03-26 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:2011-10-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/jb.173.7.2406-2408.1991
更新日期:1991-04-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/JB.155.3.1367-1371.1983
更新日期:1983-09-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/JB.116.3.1383-1397.1973
更新日期:1973-12-01 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:2003-02-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/JB.161.2.627-635.1985
更新日期:1985-02-01 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:1993-01-01 00:00:00