1m5s
From Proteopedia
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|SITE= | |SITE= | ||
|LIGAND= | |LIGAND= | ||
| - | |ACTIVITY= [http://en.wikipedia.org/wiki/Formylmethanofuran--tetrahydromethanopterin_N-formyltransferase Formylmethanofuran--tetrahydromethanopterin N-formyltransferase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.3.1.101 2.3.1.101] | + | |ACTIVITY= <span class='plainlinks'>[http://en.wikipedia.org/wiki/Formylmethanofuran--tetrahydromethanopterin_N-formyltransferase Formylmethanofuran--tetrahydromethanopterin N-formyltransferase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.3.1.101 2.3.1.101] </span> |
|GENE= | |GENE= | ||
| + | |DOMAIN= | ||
| + | |RELATEDENTRY=[[1ftr|1FTR]], [[1m5h|1M5H]] | ||
| + | |RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1m5s FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1m5s OCA], [http://www.ebi.ac.uk/pdbsum/1m5s PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=1m5s RCSB]</span> | ||
}} | }} | ||
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[[Category: alpha/beta sandwich]] | [[Category: alpha/beta sandwich]] | ||
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Mar 30 22:11:41 2008'' |
Revision as of 19:11, 30 March 2008
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| , resolution 1.85Å | |||||||
|---|---|---|---|---|---|---|---|
| Activity: | Formylmethanofuran--tetrahydromethanopterin N-formyltransferase, with EC number 2.3.1.101 | ||||||
| Related: | 1FTR, 1M5H
| ||||||
| Resources: | FirstGlance, OCA, PDBsum, RCSB | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
Formylmethanofuran:tetrahydromethanopterin fromyltransferase from Methanosarcina barkeri
Overview
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.
About this Structure
1M5S is a Single protein structure of sequence from Methanosarcina barkeri. 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
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