Abstract：
:The acidic amino acids (Asp, Glu) and their amides (Asn, Gln) support rapid growth of a variety of Pseudomonas strains when provided as the sole source of carbon and nitrogen. All key enzymes of glutamate metabolism were detected in P. fluorescence, with glutaminase and asparaginase showing the highest specific activities. A periplasmic glutaminase/asparaginase activity (PGA) was found in all pseudomonads examined, including a number of root-colonizing biocontrol strains. The enzyme was purified and shown to be identical with the ansB gene product described previously. In addition to PGA, P. fluorescens contains a cytoplasmic asparaginase with marked specificity for Asn. PGA is strongly and specifically induced by its substrates (Asn, Gln) but also by the reaction products (Asp, Glu). In addition, PGA is subject to efficient carbon catabolite repression by glucose and by citrate cycle metabolites. A mutant of P. putida KT2440 with a disrupted ansB gene was unable to utilize Gln, whereas growth of the mutant on other amino acids was normal.
journal_name
Arch Microbioljournal_title
Archives of microbiologyauthors
Sonawane A,Klöppner U,Derst C,Röhm KHdoi
10.1007/s00203-002-0511-6keywords:
subject
Has Abstractpub_date
2003-03-01 00:00:00pages
151-9issue
3eissn
0302-8933issn
1432-072Xjournal_volume
179pub_type
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pub_type： 杂志文章,评审
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