A repeating amino acid motif in CDC23 defines a family of proteins and a new relationship among genes required for mitosis and RNA synthesis

We have identified and characterized a novel, repeating 34 amino acid motif (the TPR motif) that is reiterated several times within the CDC23 gene product of S. cerevisiae. Multiple copies of this motif were discovered in five other proteins, three encoded by cell division cycle genes required to complete mitosis and two involved in RNA synthesis. Quantitative sequence analyses suggest the existence of a common underlying structure in each TPR unit that consists of amphipathic alpha-helical regions punctuated by proline-induced turns. The TPR motif defines a new family of genes and an important structural unit common to several proteins whose functions are required for mitosis and RNA synthesis.

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