This study by Nguyen et al. identifies the octahedral crystal matrix protein (OCTIN) as the structural protein that makes up sedimenting vacuolar crystals involved in gravitropism in the fungal order Mucorales (pin molds). OCTIN appears to have originated by horizontal gene transfer from bacteria, retaining elements of the original bacterial assembly mechanism, while acquiring new mutations that increase assembly size to generate crystals vastly larger than the bacterial cells from which the gene was presumably acquired. The image shows fruiting bodies of Phycomyces blakesleeanus, the focus of this study. Each stalk is a single cell that elongates to form a structure 1-3 cm tall, with a spore-containing sphere at its tip. The spores accumulate melanin as they mature, explaining the black color.
Image Credit: Tu Anh Nguyen
Perspectives
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Primers
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Short Reports
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Methods and Resources
In vivo insertion pool sequencing identifies virulence factors in a complex fungal–host interaction
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Ultrastructural localisation of protein interactions using conditionally stable nanobodies
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Meta-Research Articles
Laboratory mouse housing conditions can be improved using common environmental enrichment without compromising data
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Research Matters
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