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Contents 1 Methionine synthase 2 Vitamin B-12 3 Oxidation States of Cobalamin 4 Relevance 5 Structural highlights 6 References

Methionine synthase

spinqualitylabelsall models B-12 dependent fragment of E. coli methionine synthase with Cobalamin (in pink) Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image This page is being worked on during the Spring 2022 semester. Methionine is an amino acid our bodies require to ensure normal healthy tissue growth and repair. It is not made naturally in the body and can only be obtained from our diets first in the form of homocysteine. A lack of or deficiencies of methionine has been linked to diseases such as poor growth and birth abnormalities[1]. Homocysteine, another amino acid most commonly found int he liver, is converted to methionine. EC: 2.1.1.13 PDB ID: 1K7Y

The change from homocysteine to methionine is an SN2 reaction where one methyl group from methyltetrahydrofolate (MTHF), located on N-5, is donated. MTHF is a product of MTHFR.

This is a complex reaction as the product, tetrahydrofolate, is a poor leaving group, thus requiring a "supernucleophile" with a protein-bound B-12 vitamin Cobalamin as the methyl carrier.

Vitamin B-12

Oxidation States of Cobalamin

Relevance

Structural highlights

This is a sample scene created with SAT to by Group, and another to make of the protein. You can make your own scenes on SAT starting from scratch or loading and editing one of these sample scenes.

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References

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1. ↑ Kung Y, Ando N, Doukov TI, Blasiak LC, Bender G, Seravalli J, Ragsdale SW, Drennan CL. Visualizing molecular juggling within a B(12)-dependent methyltransferase complex. Nature. 2012 Mar 14. doi: 10.1038/nature10916. PMID:22419154 doi:10.1038/nature10916
2. ↑ Bandarian V, Pattridge KA, Lennon BW, Huddler DP, Matthews RG, Ludwig ML. Domain alternation switches B(12)-dependent methionine synthase to the activation conformation. Nat Struct Biol. 2002 Jan;9(1):53-6. PMID:11731805 doi:10.1038/nsb738
3. ↑ Szegedi SS, Castro CC, Koutmos M, Garrow TA. Betaine-homocysteine S-methyltransferase-2 is an S-methylmethionine-homocysteine methyltransferase. J Biol Chem. 2008 Apr 4;283(14):8939-45. doi: 10.1074/jbc.M710449200. Epub 2008, Jan 29. PMID:18230605 doi:http://dx.doi.org/10.1074/jbc.M710449200