This old version of Proteopedia is provided for student assignments while the new version is undergoing repairs. Content and edits done in this old version of Proteopedia after March 1, 2026 will eventually be lost when it is retired in about June of 2026.

Apply for new accounts at the new Proteopedia. Your logins will work in both the old and new versions.

1dia

From Proteopedia

(Difference between revisions)

Jump to: navigation, search

Revision as of 09:29, 6 November 2019

HUMAN METHYLENETETRAHYDROFOLATE DEHYDROGENASE / CYCLOHYDROLASE COMPLEXED WITH NADP AND INHIBITOR LY249543

Structural highlights

1dia is a 2 chain structure with sequence from Human. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Ligands:	,
Related:	1a4i, 1dib, 1dig
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Disease

[C1TC_HUMAN] Defects in MTHFD1 may be a cause of susceptibility to folate-sensitive neural tube defects (FS-NTD) [MIM:601634]. The most common NTDs are open spina bifida (myelomeningocele) and anencephaly. Genetic defects in MTHFD1 may affect the risk of spina bifida via the maternal rather than the embryonic genotype.^[1] ^[2] ^[3] Genetic variation in MTHFD1 could be associated with susceptibility to colorectal cancer (CRC) [MIM:114500].

Evolutionary Conservation

Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.

Publication Abstract from PubMed

Enzymes involved in tetrahydrofolate metabolism are of particular pharmaceutical interest, as their function is crucial for amino acid and DNA biosynthesis. The crystal structure of the human cytosolic methylenetetrahydrofolate dehydrogenase/cyclohydrolase (DC301) domain of a trifunctional enzyme has been determined previously with a bound NADP cofactor. While the substrate binding site was identified to be localized in a deep and rather hydrophobic cleft at the interface between two protein domains, the unambiguous assignment of catalytic residues was not possible. We succeeded in determining the crystal structures of three ternary DC301/NADP/inhibitor complexes. Investigation of these structures followed by site-directed mutagenesis studies allowed identification of the amino acids involved in catalysis by both enzyme activities. The inhibitors bind close to Lys56 and Tyr52, residues of a strictly conserved motif for active sites in dehydrogenases. While Lys56 is in a good position for chemical interaction with the substrate analogue, Tyr52 was found stacking against the inhibitors' aromatic rings and hence seems to be more important for proper positioning of the ligand than for catalysis. Also, Ser49 and/or Cys147 were found to possibly act as an activator for water in the cyclohydrolase step. These and the other residues (Gln100 and Asp125), with which contacts are made, are strictly conserved in THF dehydrogenases. On the basis of structural and mutagenesis data, we propose a reaction mechanism for both activities, the dehydrogenase and the cyclohydrolase.

Structures of three inhibitor complexes provide insight into the reaction mechanism of the human methylenetetrahydrofolate dehydrogenase/cyclohydrolase.,Schmidt A, Wu H, MacKenzie RE, Chen VJ, Bewly JR, Ray JE, Toth JE, Cygler M Biochemistry. 2000 May 30;39(21):6325-35. PMID:10828945^[4]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Hol FA, van der Put NM, Geurds MP, Heil SG, Trijbels FJ, Hamel BC, Mariman EC, Blom HJ. Molecular genetic analysis of the gene encoding the trifunctional enzyme MTHFD (methylenetetrahydrofolate-dehydrogenase, methenyltetrahydrofolate-cyclohydrolase, formyltetrahydrofolate synthetase) in patients with neural tube defects. Clin Genet. 1998 Feb;53(2):119-25. PMID:9611072
↑ Brody LC, Conley M, Cox C, Kirke PN, McKeever MP, Mills JL, Molloy AM, O'Leary VB, Parle-McDermott A, Scott JM, Swanson DA. A polymorphism, R653Q, in the trifunctional enzyme methylenetetrahydrofolate dehydrogenase/methenyltetrahydrofolate cyclohydrolase/formyltetrahydrofolate synthetase is a maternal genetic risk factor for neural tube defects: report of the Birth Defects Research Group. Am J Hum Genet. 2002 Nov;71(5):1207-15. Epub 2002 Oct 16. PMID:12384833 doi:S0002-9297(07)60415-7
↑ Parle-McDermott A, Kirke PN, Mills JL, Molloy AM, Cox C, O'Leary VB, Pangilinan F, Conley M, Cleary L, Brody LC, Scott JM. Confirmation of the R653Q polymorphism of the trifunctional C1-synthase enzyme as a maternal risk for neural tube defects in the Irish population. Eur J Hum Genet. 2006 Jun;14(6):768-72. PMID:16552426 doi:5201603
↑ Schmidt A, Wu H, MacKenzie RE, Chen VJ, Bewly JR, Ray JE, Toth JE, Cygler M. Structures of three inhibitor complexes provide insight into the reaction mechanism of the human methylenetetrahydrofolate dehydrogenase/cyclohydrolase. Biochemistry. 2000 May 30;39(21):6325-35. PMID:10828945

1 Structural highlights
2 Disease
3 Evolutionary Conservation
4 Publication Abstract from PubMed
5 See Also
6 References

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/1dia"

@@ Line 1: / Line 1: @@
 ==HUMAN METHYLENETETRAHYDROFOLATE DEHYDROGENASE / CYCLOHYDROLASE COMPLEXED WITH NADP AND INHIBITOR LY249543==
-<StructureSection load='1dia' size='340' side='right' caption='[[1dia]], [[Resolution|resolution]] 2.20&Aring;' scene=''>
+<StructureSection load='1dia' size='340' side='right'caption='[[1dia]], [[Resolution|resolution]] 2.20&Aring;' scene=''>
 == Structural highlights ==
 <table><tr><td colspan='2'>[[1dia]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Human Human]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1DIA OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1DIA FirstGlance]. <br>
@@ Line 29: / Line 29: @@
 </div>
 <div class="pdbe-citations 1dia" style="background-color:#fffaf0;"></div>
+==See Also==
+*[[Cyclohydrolase 3D structures|Cyclohydrolase 3D structures]]
+*[[Journal:Acta Cryst F:S2053230X18018083|Journal:Acta Cryst F:S2053230X18018083]]
 == References ==
 <references/>
@@ Line 34: / Line 38: @@
 </StructureSection>
 [[Category: Human]]
+[[Category: Large Structures]]
 [[Category: Bewly, J R]]
 [[Category: Chen, V J]]

1dia

From Proteopedia

Revision as of 09:29, 6 November 2019

HUMAN METHYLENETETRAHYDROFOLATE DEHYDROGENASE / CYCLOHYDROLASE COMPLEXED WITH NADP AND INHIBITOR LY249543

Structural highlights

Disease

Evolutionary Conservation

Publication Abstract from PubMed

See Also

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

Views

Personal tools

Navigation

Search

Toolbox