1M5S image
Deposition Date 2002-07-10
Release Date 2002-07-26
Last Version Date 2024-04-03
Entry Detail
PDB ID:
1M5S
Keywords:
Title:
Formylmethanofuran:tetrahydromethanopterin fromyltransferase from Methanosarcina barkeri
Biological Source:
Source Organism:
Method Details:
Experimental Method:
Resolution:
1.85 Å
R-Value Free:
0.24
R-Value Work:
0.19
R-Value Observed:
0.19
Space Group:
C 1 2 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Formylmethanofuran--tetrahydromethanopterin formyltransferase
Gene (Uniprot):ftr
Chain IDs:A, B, C, D
Chain Length:297
Number of Molecules:4
Biological Source:Methanosarcina barkeri
Primary Citation
Crystal structures and enzymatic properties of three formyltransferases from archaea: environmental adaptation and evolutionary relationship.
Protein Sci. 11 2168 2178 (2002)
PMID: 12192072 DOI: 10.1110/ps.0211002

Abstact

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.

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Primary Citation of related structures