PROSITE documentation PDOC00985Protein-L-isoaspartate(D-aspartate) O-methyltransferase signature
Protein-L-isoaspartate(D-aspartate) O-methyltransferase (EC 2.1.1.77) (PCMT) [1] (which is also known as L-isoaspartyl protein carboxyl methyltransferase) is an enzyme that catalyzes the transfer of a methyl group from S-adenosylmethionine to the free carboxyl groups of D-aspartyl or L-isoaspartyl residues in a variety of peptides and proteins. The enzyme does not act on normal L-aspartyl residues L-isoaspartyl and D-aspartyl are the products of the spontaneous deamidation and/or isomerization of normal L-aspartyl and L-asparaginyl residues in proteins. PCMT plays a role in the repair and/or degradation of these damaged proteins; the enzymatic methyl esterification of the abnormal residues can lead to their conversion to normal L-aspartyl residues.
PCMT is a well-conserved and widely distributed cytosolic protein of about 24 Kd. As a signature pattern, we selected a conserved region in the central part of this enzyme.
Last update:December 2004 / Pattern and text revised.
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PROSITE method (with tools and information) covered by this documentation:
| 1 | Authors | Kagan R.M. McFadden H.J. McFadden P.N. O'Connor C. Clarke S. |
| Title | Molecular phylogenetics of a protein repair methyltransferase. | |
| Source | Comp. Biochem. Physiol. 117b:379-385(1997). |
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