Inactivation of allantoinase fromPseudomonas aeruginosaby a subunit of urease

✍ Scribed by F. E. Windt; C. Drift

• Book ID: 104777718
• Publisher: Springer
• Year: 1976
• Tongue: English
• Weight: 540 KB
• Volume: 111
• Category: Article
• ISSN: 0302-8933
• DOI: 10.1007/bf00446558

✦ Synopsis

Cell-free extracts prepared from Pseudomonas aeruginosa cells, cultured in a medium containing allantoin as sole source of carbon, nitrogen and energy and harvested in the stationary phase, contain an enzymicly inactive allantoinase-inhibitor complex. Pure inhibitor was isolated by dissociation of this complex followed by gelfiltration. The inhibitor had a molecular weight of about 5500 daltons. Association between inhibitor and allantoinase was demonstrated by gel filtration and by polyacrylamide gelelectrophoresis. The inhibitor was unstable in the absence of 1 M urea and the inactivation was accompanied by aggregate formation and appearance of urease activity. The inhibitor was also isolated from cells containing urease but no allantoinase. It was concluded that the inhibitor is a subunit of urease.

Inhibitors isolated from P. aeruginosa and P. acidovorans cells were active against both allantoinase from P. aeruginosa and allantoinase from P. acidovorans.