Abstract：
:Histoplasma capsulatum, like many other fungal pathogens, is dimorphic: it exists as mycelia in the soil and yeast in animal hosts. Because only the yeast phase is parasitic, factors which affect morphogenesis have been of interest for understanding and controlling pathogenicity. In culture, the mycelial to yeast transition of H. capsulatum is induced by a temperature shift from 25 to 37 degrees C (ref. 1). The transition occurs over several days and is accompanied by marked changes in metabolic processes, including respiration and cysteine metabolism. Here, we show that the triggering event for these morphological and biochemical changes is a rapid decline in intracellular ATP levels that follows uncoupling of oxidative phosphorylation when mycelia are shifted from 25 to 37 degrees C. We also show that respiration in the yeast phase is coupled at 37 degrees C and thus that the morphological transition may be viewed as a heat shock followed by cellular adaptation to higher temperature.
journal_name
Naturejournal_title
Natureauthors
Lambowitz AM,Kobayashi GS,Painter A,Medoff Gdoi
10.1038/303806a0subject
Has Abstractpub_date
1983-06-30 00:00:00pages
806-8issue
5920eissn
0028-0836issn
1476-4687journal_volume
303pub_type
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