PROFILPELAJAR.COM

Transmethylation

The recovery of methionine from homocysteine by transmethylation is depicted in reaction 4. The transmethylation cycle is depicted in reactions 1–4.

Transmethylation is a biologically important organic chemical reaction in which a methyl group is transferred from one compound to another.

An example of transmethylation is the recovery of methionine from homocysteine. In order to sustain sufficient reaction rates during metabolic stress, this reaction requires adequate levels of vitamin B12 and folate. Methyl tetrahydrofolate delivers methyl groups to form the active methyl form of vitamin B12 that is required for methylation of homocysteine. Deficiencies of vitamin B12 or folate cause increased levels of circulating homocysteine. Elevated homocysteine is a risk factor for cardiovascular disease and is linked to the metabolic syndrome (insulin insensitivity).[1]

Transmethylation is decreased sometimes in parents of children with autism.[2]

See also

References

  1. ^ Carmel R, Green R, Rosenblatt DS, Watkins D (2003). "Update on cobalamin, folate, and homocysteine" (PDF). Hematology Am Soc Hematol Educ Program. 2003: 62–81. doi:10.1182/asheducation-2003.1.62. PMID 14633777.
  2. ^ James SJ, Melnyk S, Jernigan S, Hubanks A, Rose S, Gaylor DW (November 2008). "Abnormal transmethylation/transsulfuration metabolism and DNA hypomethylation among parents of children with autism". J Autism Dev Disord. 38 (10): 1966–75. doi:10.1007/s10803-008-0591-5. PMC 2584168. PMID 18512136.


Stub icon

This organic chemistry article is a stub. You can help Wikipedia by adding missing information.

Content Disclaimer

Informasi ini disarikan dari Wikipedia dan disajikan kembali untuk tujuan edukasi. Konten tersedia di bawah lisensi CC BY-SA 3.0. Kami tidak bertanggung jawab atas ketidakakuratan data yang bersumber dari kontribusi publik tersebut.

  1. The information displayed on this website is sourced in part or in whole from Wikipedia and has been adapted for the purpose of restating it. We strive to provide accurate and relevant information, however:
  2. There is no guarantee of absolute accuracy. Wikipedia is an open, collaborative project that can be edited by anyone, so information is subject to change.
  3. It is not intended to constitute professional advice. The content displayed is for informational and educational purposes only. For important decisions (e.g., medical, legal, or financial), please consult a professional.
  4. Content copyright. Wikipedia is licensed under the Creative Commons Attribution-ShareAlike License (CC BY-SA). This means that content may be reused with appropriate attribution and shared under a similar license.
  5. Responsible use. Any risk arising from the use of information from this website is entirely the responsibility of the user.