Access the full text.
Sign up today, get DeepDyve free for 14 days.
K. Kounga, D. Velde, R. Himes (1995)
18Oxygen incorporation into inorganic phosphate in the reaction catalyzed byN 5,10‐methenyltetrahydrofolate synthetaseFEBS Letters, 364
S. Provencher, J. Glöckner (1981)
Estimation of globular protein secondary structure from circular dichroism.Biochemistry, 20 1
Shengfeng Chen, A. Yakunin, Michael Proudfoot, R. Kim, Sung-Hou Kim (2004)
Structural and functional characterization of a 5,10‐methenyltetrahydrofolate synthetase from Mycoplasma pneumoniae (GI: 13508087)Proteins: Structure, 61
Reto Koradi, M. Billeter, K. Wüthrich (1996)
MOLMOL: a program for display and analysis of macromolecular structures.Journal of molecular graphics, 14 1
R. Kim, S. Sandler, S. Goldman, H. Yokota, A. Clark, Sung-Hou Kim (1998)
Overexpression of archaeal proteins in Escherichia coliBiotechnology Letters, 20
M. Field, D. Szebenyi, Cheryll Perry, P. Stover (2007)
Inhibition of 5,10-methenyltetrahydrofolate synthetase.Archives of biochemistry and biophysics, 458 2
N. Sreerama, R. Woody (2000)
Estimation of protein secondary structure from circular dichroism spectra: comparison of CONTIN, SELCON, and CDSSTR methods with an expanded reference set.Analytical biochemistry, 287 2
(2006)
Kinetic parameters for wt and K120A forms of MTHFS MTHFS form Km ATP (lM) kcat ATP (s ) Km 5-formylTHF (lM) kcat 5-formylTHF (s ) Wild type
N. Sreerama, S. Venyaminov, R. Woody (2008)
Estimation of the number of α‐helical and β‐strand segments in proteins using circular dichroism spectroscopyProtein Science, 8
Shengfeng Chen, D. Shin, R. Pufan, R. Kim, Sung-Hou Kim (2004)
Crystal structure of methenyltetrahydrofolate synthetase from Mycoplasma pneumoniae (GI: 13508087) at 2.2 Å resolutionProteins: Structure, 56
Teng Huang, V. Schirch (1995)
Mechanism for the Coupling of ATP Hydrolysis to the Conversion of 5-Formyltetrahydrofolate to 5,10-Methenyltetrahydrofolate (*)The Journal of Biological Chemistry, 270
J. Sambrook, E. Fritsch, T. Maniatis (2001)
Molecular Cloning: A Laboratory Manual
J. Jolivet (1997)
Human 5,10-methenyltetrahydrofolate synthetase.Methods in enzymology, 281
L. Bailey (2009)
Folate in Health and Disease
W. Johnson (1999)
Analyzing protein circular dichroism spectra for accurate secondary structuresProteins: Structure, 35
L. Bailey, J. Gregory (1999)
Polymorphisms of methylenetetrahydrofolate reductase and other enzymes: metabolic significance, risks and impact on folate requirement.The Journal of nutrition, 129 5
A. Fersht (1977)
Enzyme structure and mechanism
J. Jolivet, A. Dayan, M. Beauchemin, D. Chahla, A. Mamo, R. Bertrand (1996)
Biochemical and Molecular Studies of Human Methenyltetrahydrofolate SynthetaseSTEM CELLS, 14
H. Kruschwitz, D. McDonald, E. Cossins, V. Schirch (1994)
5-Formyltetrahydropteroylpolyglutamates are the major folate derivatives in Neurospora crassa conidiospores.The Journal of biological chemistry, 269 46
P. Gorry (1990)
General least-squares smoothing and differentiation by the convolution (Savitzky-Golay) methodAnalytical Chemistry, 62
Hiroaki Inoue, H. Nojima, Hiroto Okayama (1990)
High efficiency transformation of Escherichia coli with plasmids.Gene, 96 1
L. Allen (2003)
Stem cells.The New England journal of medicine, 349 15
I. Rose (1985)
Enzyme structure and mechanism (2nd edn): by Alan Fersht, W. H. Freeman & Co., 1985. £14.95 pbk, £28.95 hbk (xxi + 475 pages) ISBN 0 7167 1615 1Trends in Biochemical Sciences, 10
Vivek Anantharaman, L. Aravind (2006)
Diversification of catalytic activities and ligand interactions in the protein fold shared by the sugar isomerases, eIF2B, DeoR transcription factors, acyl-CoA transferases and methenyltetrahydrofolate synthetase.Journal of molecular biology, 356 3
5,10-Methenyltetrahydrofolate synthetase (MTHFS) catalyzes the conversion of 5-formyltetrahydrofolate to 5,10-methenyltetrahydrofolate coupled to the hydrolysis of ATP. A co-crystal structure of MTHFS bound to its substrates has been published (Chen et al., Proteins 56:839–843, 2005) that provides insights into the mechanism of this reaction. To further investigate this mechanism, we have replaced the arginine at position 115 and the lysine at position 120 with alanine (R115A and K120A, respectively). Circular dichroism spectra for both mutants are consistent with folded proteins. R115A shows no activity, suggesting that R115 plays a critical role in the activity of the enzyme. The K120A mutation increases the Michaelis constant (Km) for ATP from 76 to 1,200 μM and the Km for 5-formylTHF from 2.5 to 7.1 μM. The weaker binding of substrates by K120A may be due to movement of a loop consisting of residues 117 though 120, which makes several hydrogen bonds to ATP and may be held in position by K120.
The Protein Journal – Springer Journals
Published: May 13, 2008
Read and print from thousands of top scholarly journals.
Already have an account? Log in
Bookmark this article. You can see your Bookmarks on your DeepDyve Library.
To save an article, log in first, or sign up for a DeepDyve account if you don’t already have one.
Copy and paste the desired citation format or use the link below to download a file formatted for EndNote
Access the full text.
Sign up today, get DeepDyve free for 14 days.
All DeepDyve websites use cookies to improve your online experience. They were placed on your computer when you launched this website. You can change your cookie settings through your browser.