303 



Amino Acids and Related Compounds 



In this earlier study most of the extracellular nitrogen appeared 

 to be peptide in nature, yielding some 14 amino acids on hy- 

 drolysis. In the one case tested one of the fungi was unable to 

 use the extracellular nitrogen formed, but assimilated the con- 

 stituent amino acids when these were liberated by acid hydroly- 

 sis. 



A quantitative report has been made on the free amino acids 

 present in an alcohol extract of Miicor miLcedo.^ They were as 

 follows : 



TABLE V 

 Amino Acids Present in 75% Alcohol Extracfs of Mucor mucedo (as % Tofai Nitrogen) 



Amino acid 



Hydrolysate of 

 insoluble residue 



Alanine 



/3-Alanine 



Arginine 



Asparagine 



Aspartic acid 



-)-Aminobutyric acid 



Citrulline 



Cystine 



Giutamine 



Glutamic acid 



Glycine 



Histidine 



iso-Leucine 



Leucine 



Lysine 



Methionine 



Proline 



Phenylalanine 



Serine 



Threonine 



Tyrosine 



Valine 



6.7 

 12.2 

 16.4 



2.2 



35.2 

 3.8 

 1.6 

 0.7 

 5.2 

 3.8 

 1.1 

 4.2 

 1.0 

 3.3 

 2.2 

 2.1 

 4.4 



These values were compared with those of other plants over a 

 taxonomic range. 



A report of the free amino acids produced by Penicillium 

 roquefortii indicated the following to be most prominent:^ 



^K. Mansford and R. Raper, Nature 174 314 (1954). 

 ^ J. Kolousek and S. Michalik, Sbornik Ceskoslov. Akad. Zemedel 

 Ved. 27A 281 (1954). (Chem. Abstr. 50 4295c) 



