Intracellular Action of a Secreted Peptide Required for Fungal Virulence.

Intracellular Action of a Secreted Peptide Required for Fungal Virulence.
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DOI:
10.1016/j.chom.2016.05.001
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发表时间:
2016-06-08
影响因子:
30.3
通讯作者:
Madhani HD
Madhani HD
中科院分区:
医学1区
文献类型:
--
作者:
Homer CM;Summers DK;Goranov AI;Clarke SC;Wiesner DL;Diedrich JK;Moresco JJ;Toffaletti D;Upadhya R;Caradonna I;Petnic S;Pessino V;Cuomo CA;Lodge JK;Perfect J;Yates JR 3rd;Nielsen K;Craik CS;Madhani HD

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Quorum sensing (QS) is a bacterial communication mechanism in which secreted signaling molecules impact population function and gene expression. QS-like phenomena have been reported in eukaryotes with largely unknown contributing molecules, functions, and mechanisms. We identify Qsp1, a secreted peptide, as a central signaling molecule that regulates virulence in the fungal pathogen Cryptococcus neoformans. QSP1 is a direct target of three transcription factors required for virulence, and qsp1Δ mutants exhibit attenuated infection, slowed tissue accumulation, and greater control by primary macrophages. Qsp1 mediates autoregulatory signaling that modulates secreted protease activity and promotes cell wall function at high cell densities. Peptide production requires release from a secreted precursor, proQsp1, by a cell-associated protease, Pqp1. Qsp1 sensing requires an oligopeptide transporter, Opt1, and remarkably, cytoplasmic expression of mature Qsp1 complements multiple phenotypes of qsp1Δ. Thus, C. neoformans produces an autoregulatory peptide that matures extracellularly but functions intracellularly to regulate virulence.
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