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Arginase isoforms in frog and lizard tissues

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Title Arginase isoforms in frog and lizard tissues
 
Creator Venkatakrishnan, Gita
Reddy, S R R
 
Subject Arginase isoforms
Frog and lizard tissues
Nitrotelism
Chromatographic behavior
Electrophoretic mobility
Antigenic properties
Activation by antibodies
 
Description 13-19
Isoforms of arginase in the liver and kidney tissues of the ureotelic frog (Rana tigerina) and uricotelic lizard (Calotes versicolor) were fractionated by DEAE-cellulose chromatography (pH 8.3). Four molecular forms, designated as A’1, A2, A3 and A4 based on the KCl concentration required for their elution from the ion-exchange column, were detected in lizard liver, while only two forms were found in lizard kidney (A3 and A4) and frog liver and kidney (A2 and A3). No major differences were found in the pH optimum, substrate affinity and molecular weight of the isoenzymes. The isoforms in lizard tissues were either totally unaffected or only partially immunoprecipitated by antibodies raised against rat liver and beef liver arginases, but those in frog tissues were significantly activated by the two antibodies. While the physiological importance of the presence of four isoforms in lizard liver remains enigmatic, different sets of isoenzymes were present in the liver of the two ureotelic vertebrates, rat and frog. Hence, it appeared that a given mode of nitrotelism was not associated with a specific set of isoenzymes. Also, the data were not consistent with the generally held view that a basic isoform of arginase served as a component of the urea cycle in liver and a neutral/slightly acidic form functions in the synthesis of proline, glutamate and polyamines in extra-hepatic tissues. The isoforms appeared to show considerable functional overlap.
 
Date 2010-02-24T06:42:13Z
2010-02-24T06:42:13Z
2010-02
 
Type Article
 
Identifier 0975-0959 (Online); 0301-1208 (Print)
http://hdl.handle.net/123456789/7462
 
Language en_US
 
Publisher CSIR
 
Source IJBB Vol.47(1) [February 2010]