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Formylmethanofuran—tetrahydromethanopterin N-formyltransferase
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・ Formyltetrahydrofolate dehydrogenase
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Formylmethanofuran—tetrahydromethanopterin N-formyltransferase : ウィキペディア英語版
Formylmethanofuran—tetrahydromethanopterin N-formyltransferase

In enzymology, a formylmethanofuran-tetrahydromethanopterin N-formyltransferase () is an enzyme that catalyzes the chemical reaction
:formylmethanofuran + 5,6,7,8-tetrahydromethanopterin \rightleftharpoons methanofuran + 5-formyl-5,6,7,8-tetrahydromethanopterin
Thus, the two substrates of this enzyme are formylmethanofuran and 5,6,7,8-tetrahydromethanopterin, whereas its two products are methanofuran and 5-formyl-5,6,7,8-tetrahydromethanopterin.
This enzyme belongs to the family of transferases, specifically those acyltransferases transferring groups other than aminoacyl groups. The systematic name of this enzyme class is formylmethanofuran:5,6,7,8-tetrahydromethanopterin 5-formyltransferase. Other names in common use include formylmethanofuran-tetrahydromethanopterin formyltransferase, formylmethanofuran:tetrahydromethanopterin formyltransferase, N-formylmethanofuran(CHO-MFR):tetrahydromethanopterin(H4MPT), formyltransferase, FTR, formylmethanofuran:5,6,7,8-tetrahydromethanopterin, and N5-formyltransferase. This enzyme participates in folate biosynthesis.
Ftr from the thermophilic methanogen ''Methanopyrus kandleri'' (which has an optimum growth temperature 98 degrees C) is a hyperthermophilic enzyme that is absolutely dependent on the presence of lyotropic salts for activity and thermostability. The crystal structure of Ftr, determined to a reveals a homotetramer composed essentially of two dimers. Each subunit is subdivided into two tightly associated lobes both consisting of a predominantly antiparallel beta sheet flanked by alpha helices forming an alpha/beta sandwich structure. The approximate location of the active site was detected in a region close to the dimer interface. Ftr from the mesophilic methanogen ''Methanosarcina barkeri'' and the sulphate-reducing archaeon ''Archaeoglobus fulgidus'' have a similar structure.
In the methylotrophic bacterium ''Methylobacterium extorquens'', Ftr interacts with three other polypeptides to form an Ftr/cyclohydrolase complex which catalyses the hydrolysis of formyl-tetrahydromethanopterin to formate during growth on C1 substrates.
==Structural studies==

As of late 2007, 5 structures have been solved for this class of enzymes, with PDB accession codes , , , , and .

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