Authors: Gathman, Allen C.; Lilly, Walt W.; Ulrich, Cynthia E.

Source: Canadian Journal of Microbiology, Volume 53, Number 11, November 2007 , pp. 1278-1281(4)

Publisher: NRC Research Press

Abstract:

The leaf-litter fungus Coprinus cinereus maintains a pool of free amino acid in its mycelium. When the organism is grown under conditions of high nitrogen availability with 13.2mmol·L^-1 <span class="smallcap">l</span>-asparagine as the nitrogen source, the primary constituents of this pool are glutamine, alanine, and glutamic acid. Together these 3 amino acids comprise approximately 70% of the pool. Nitrogen deprivation reduces the size of the free amino acid pool by 75%, and neither a high concentration of ammonium nor a protein nitrogen source support a similar pool size as <span class="smallcap">l</span>-asparagine. Nitrogen deprivation also reduces the concentration of glutamine to the pool while increasing glutamate. Concomitant with this shift is a marked increase in mycelial ammonium.

Le champignon de paillis Coprinus cinereus maintient un pool d'acides aminés libres dans son mycélium. Lorsque l'organisme est cultivé sous des conditions de haute disponibilité en azote, 13,2mmol·L^-1 <span class="smallcap">l</span>-asparagine étant la source d'azote, les constituants primaires de cette réserve sont la glutamine, l'alanine et l'acide glutamique. Ensemble, ces 3 acides aminés constituent environ 70 % de la réserve. La privation en azote réduit la taille de ce pool d'acides aminés libres de 75 %, et ni une forte concentration d'ammonium, ni une source d'azote protéique ne permet d'obtenir un pool de la taille de celui obtenu en présence de <span class="smallcap">l</span>-asparagine. La privation en azote réduit aussi la concentration de glutamine alors que celle du glutamate augmente. Une forte augmentation de l'ammonium du mycélium se produit en parallèle à ce changement.

Document Type: Research article

Publication date: 2007-11-01

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• Published since 1954, this monthly journal contains new research in the field of microbiology including applied microbiology and biotechnology; microbial structure and function; fungi and other eucaryotic protists; infection and immunity; microbial ecology; physiology, metabolism and enzymology; and virology, genetics, and molecular biology. It also publishes review articles and notes on an occasional basis, contributed by recognized scientists worldwide.
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