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Ure2p of Candida albicans (Ure2(albicans) or CaUre2p) can be a prion in Saccharomyces cerevisiae, but Ure2p of Candida glabrata (Ure2(glabrata)) cannot, even though the Ure2(glabrata) N-terminal domain is more similar to that of the S. cerevisiae Ure2p (Ure2(cerevisiae)) than Ure2(albicans) is. We show that the N-terminal N/Q-rich prion domain of Ure2(albicans) forms amyloid that is infectious, transmitting [URE3alb] to S. cerevisiae cells expressing only C. albicans Ure2p. Using solid-state nuclear magnetic resonance of selectively labeled C. albicans Ure2p(1-90), we show that this infectious amyloid has an in-register parallel β-sheet structure, like that of the S. cerevisiae Ure2p prion domain and other S. cerevisiae prion amyloids. In contrast, the N/Q-rich N-terminal domain of Ure2(glabrata) does not readily form amyloid, and that formed upon prolonged incubation is not infectious.

Amyloid of the Candida albicans Ure2p Prion Domain Is Infectious and Has an In-Register Parallel β-Sheet Structure