Trehalose breakdown in germinating spores of Mucor rouxii

Laere, André J. Van; Slegers, L.

doi:10.1111/j.1574-6968.1987.tb02205.x

Cited by 8 publications

(3 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The accumulation of trehalose by the true survival and dispersal phases represented by the diverse spore types, produced by yeasts, fungi, actinomycetes and slime moulds is also consistent with a general function in stress tolerance and the resistance of these spores to several environmental stresses is directly correlated with their trehalose content [55,60,61,63]. Indeed, in at least some spores, trehalose appears to play a role in the maintenance of dormancy, as the lag time for germination is directly related to trehalose content [63] and there is a rapid breakdown of trehalose during germination, which is often not coupled to metabolism, as the breakdown products are excreted into the growth medium [55,126,127].…”

Section: Ecological Benefits To Individual Cellssupporting

confidence: 58%

Ecological significance of compatible solute accumulation by micro-organisms: from single cells to global climate

2000

View full text Add to dashboard Cite

The osmoadaptation of most micro-organisms involves the accumulation of K(+) ions and one or more of a restricted range of low molecular mass organic solutes, collectively termed 'compatible solutes'. These solutes are accumulated to high intracellular concentrations, in order to balance the osmotic pressure of the growth medium and maintain cell turgor pressure, which provides the driving force for cell extension growth. In this review, I discuss the alternative roles which compatible solutes may also play as intracellular reserves of carbon, energy and nitrogen, and as more general stress metabolites involved in protection of cells against other environmental stresses including heat, desiccation and freezing. Thus, the evolutionary selection for the accumulation of a specific compatible solute may not depend solely upon its function during osmoadaptation, but also upon the secondary benefits its accumulation provides, such as increased tolerance of other environmental stresses prevalent in the organism's niche or even anti-herbivory or dispersal functions in the case of dimethylsulfoniopropionate (DMSP). In the second part of the review, I discuss the ecological consequences of the release of compatible solutes to the environment, where they can provide sources of compatible solutes, carbon, nitrogen and energy for other members of the micro-flora. Finally, at the global scale the metabolism of specific compatible solutes (betaines and DMSP) in brackish water, marine and hypersaline environments may influence global climate, due to the production of the trace gases, methane and dimethylsulfide (DMS) and in the case of DMS, also couple the marine and terrestrial sulfur cycles.

show abstract

Section: Ecological Benefits To Individual Cellssupporting

confidence: 58%

Ecological significance of compatible solute accumulation by micro-organisms: from single cells to global climate

2000

View full text Add to dashboard Cite

show abstract

“…Trehalose, which cleaves trehalose, has been detected in cell extracts of aerobically and anaerobically germinating sporangiospores of M. rouxii (229). The appearance of enzyme activity in either system is dependent on exogenous glucose or cyclic AMP.…”

Section: Enzymesmentioning

confidence: 99%

Mucor dimorphism.

Orlowski¹

1991

Microbiological Reviews

115

View full text Add to dashboard Cite

“…In fact, some fungal spores have the capacity to germinate in water, apparently using their trehalose stock as sole carbon reserve (reviewed in [3]). Other authors, however, have questioned the energetic value of cytosolic trehalose mobilisation (see for instance [16]).…”

Section: Catabolism Of Trehalose In Fungimentioning

confidence: 99%

Trehalases and trehalose hydrolysis in fungi

Jorge

Polizeli

Thevelein

et al. 2006

FEMS Microbiology Letters

105

View full text Add to dashboard Cite

The simultaneous presence of two different trehalose-hydrolysing activities has been recognised in several fungal species. While these enzymes, known as acid and neutral trehalases, share a strict specificity for trehalose, they are nevertheless rather different in subcellular localisation and in several biochemical and regulatory properties. The function of these apparently redundant activities in the same cell was not completely understood until recently. Biochemical and genetic studies now suggest that these enzymes may have specialised and exclusive roles in fungal cells. It is thought that neutral trehalases mobilise cytosolic trehalose, under the control of developmental programs, chemical and nutrient signals, or stress responses. On the other hand, acid trehalases appear not to mobilise cytosolic trehalose, but to act as 'carbon scavenger' hydrolases enabling cells to utilise exogenous trehalose as a carbon source, under the control of carbon catabolic regulatory circuits. Although much needs to be learned about the molecular identity of trehalases, it seems that in fungi at least one class of acid trehalases evolved independently from the other trehalases.

show abstract

Trehalose breakdown in germinating spores of Mucor rouxii

Cited by 8 publications

References 24 publications

Ecological significance of compatible solute accumulation by micro-organisms: from single cells to global climate

Ecological significance of compatible solute accumulation by micro-organisms: from single cells to global climate

Mucor dimorphism.

Trehalases and trehalose hydrolysis in fungi

Contact Info

Product

Resources

About