Purification,properties and primary structure of H2-formingN
5,N10-methylenetetrahydromethanopterin dehydrogenase fromMethanococcus thermolithotrophicus |
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Authors: | Gudrun C Hartmann Andreas R Klein Monica Linder Rudolf K Thauer |
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Institution: | (1) Max-Planck-Institut für terrestrische Mikrobiologie, Karl-von-Frisch-Strasse, D-35043 Marburg, Germany;(2) Laboratorium für Mikrobiologie des Fachbereichs Biologie der Philipps-Universität, Marburg, Germany;(3) Biochemisches Institut, Fachbereich Humanmedizin, Justus-Liebig-Universität, Giessen, Germany |
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Abstract: | H2-FormingN
5,N10-methylenetetrahydromethanopterin dehydrogenase (Hmd) is a novel type of hydrogenase found in methanogenic Achaea that contains neither nickel nor iron-sulfur clusters. The enzyme has previously been characterized fromMethanobacterium thermoautotrophicum and fromMethanopyrus kandleri. We report here on the purification and properties of the enzyme fromMethanococcus thermolithotrophicus. Thehmd gene was cloned and sequenced. The results indicate that the enzyme fromMc. thermolithotrophicus is functionally and structurally closely related to the H2-forming methylene tetrahydromethanopterin dehydrogenase fromMb. thermoautotrophicum andMp. kandleri. From amino acid sequence comparisons of the three enzymes, a phylogenetic tree was deduced that shows branching orders similar to those derived from sequence comparisons of the 16S rRNA of the orders Methanococcales, Methanobacteriales, and Methanopyrales.Abbreviations
H
2
Forming dehydrogenase orHmd
- H2-FormingN
5,N10
methylene tetrahydromethanopterin dehydrogenase
-
H
4MPT
Tetrahydromethanopterin
-
CH
2=H4MPT N5,N10
Methylene tetrahydromethanopterin
-
CH H
4MPT+ N5,N10
Methenyltetrahydromethanopterin
-
MALDI-TOF-MS
Matrix-assisted laser desorption |
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Keywords: | Archaea Methanococcus Methane formation Hydrogenases H2-Forming dehydrogenase N
5 N
10-Methylenetetrahydromethanopterin |
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