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| | {{STRUCTURE_1m5h| PDB=1m5h | SCENE= }} | | {{STRUCTURE_1m5h| PDB=1m5h | SCENE= }} |
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| - | '''Formylmethanofuran:tetrahydromethanopterin formyltransferase from Archaeoglobus fulgidus'''
| + | ===Formylmethanofuran:tetrahydromethanopterin formyltransferase from Archaeoglobus fulgidus=== |
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| - | ==Overview==
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| - | Formyltransferase catalyzes the reversible formation of formylmethanofuran from N(5)-formyltetrahydromethanopterin and methanofuran, a reaction involved in the C1 metabolism of methanogenic and sulfate-reducing archaea. The crystal structure of the homotetrameric enzyme from Methanopyrus kandleri (growth temperature optimum 98 degrees C) has recently been solved at 1.65 A resolution. We report here the crystal structures of the formyltransferase from Methanosarcina barkeri (growth temperature optimum 37 degrees C) and from Archaeoglobus fulgidus (growth temperature optimum 83 degrees C) at 1.9 A and 2.0 A resolution, respectively. Comparison of the structures of the three enzymes revealed very similar folds. The most striking difference found was the negative surface charge, which was -32 for the M. kandleri enzyme, only -8 for the M. barkeri enzyme, and -11 for the A. fulgidus enzyme. The hydrophobic surface fraction was 50% for the M. kandleri enzyme, 56% for the M. barkeri enzyme, and 57% for the A. fulgidus enzyme. These differences most likely reflect the adaptation of the enzyme to different cytoplasmic concentrations of potassium cyclic 2,3-diphosphoglycerate, which are very high in M. kandleri (>1 M) and relatively low in M. barkeri and A. fulgidus. Formyltransferase is in a monomer/dimer/tetramer equilibrium that is dependent on the salt concentration. Only the dimers and tetramers are active, and only the tetramers are thermostable. The enzyme from M. kandleri is a tetramer, which is active and thermostable only at high concentrations of potassium phosphate (>1 M) or potassium cyclic 2,3-diphosphoglycerate. Conversely, the enzyme from M. barkeri and A. fulgidus already showed these properties, activity and stability, at much lower concentrations of these strong salting-out salts.
| + | The line below this paragraph, {{ABSTRACT_PUBMED_12192072}}, adds the Publication Abstract to the page |
| | + | (as it appears on PubMed at http://www.pubmed.gov), where 12192072 is the PubMed ID number. |
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| | + | {{ABSTRACT_PUBMED_12192072}} |
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| | ==About this Structure== | | ==About this Structure== |
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| | [[Category: Tziatzios, C.]] | | [[Category: Tziatzios, C.]] |
| | [[Category: Alpha/beta sandwich]] | | [[Category: Alpha/beta sandwich]] |
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 00:39:28 2008'' | + | |
| | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Wed Jul 2 23:15:21 2008'' |
Revision as of 20:15, 2 July 2008
Template:STRUCTURE 1m5h
Formylmethanofuran:tetrahydromethanopterin formyltransferase from Archaeoglobus fulgidus
Template:ABSTRACT PUBMED 12192072
About this Structure
1M5H is a Single protein structure of sequence from Archaeoglobus fulgidus. Full crystallographic information is available from OCA.
Reference
Crystal structures and enzymatic properties of three formyltransferases from archaea: environmental adaptation and evolutionary relationship., Mamat B, Roth A, Grimm C, Ermler U, Tziatzios C, Schubert D, Thauer RK, Shima S, Protein Sci. 2002 Sep;11(9):2168-78. PMID:12192072
Page seeded by OCA on Wed Jul 2 23:15:21 2008
