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. 1999 Aug;8(8):1658–1667. doi: 10.1110/ps.8.8.1658

The alpha-subunit of protein prenyltransferases is a member of the tetratricopeptide repeat family.

H Zhang 1, N V Grishin 1
PMCID: PMC2144414  PMID: 10452610

Abstract

Lipidation catalyzed by protein prenyltransferases is essential for the biological function of a number of eukaryotic proteins, many of which are involved in signal transduction and vesicular traffic regulation. Sequence similarity searches reveal that the alpha-subunit of protein prenyltransferases (PTalpha) is a member of the tetratricopeptide repeat (TPR) superfamily. This finding makes the three-dimensional structure of the rat protein farnesyltransferase the first structural model of a TPR protein interacting with its protein partner. Structural comparison of the two TPR domains in protein farnesyltransferase and protein phosphatase 5 indicates that variation in TPR consensus residues may affect protein binding specificity through altering the overall shape of the TPR superhelix. A general approach to evolutionary analysis of proteins with repetitive sequence motifs has been developed and applied to the protein prenyltransferases and other TPR proteins. The results suggest that all members in PTalpha family originated from a common multirepeat ancestor, while the common ancestor of PTalpha and other members of TPR superfamily is likely to be a single repeat protein.

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Selected References

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