منابع مشابه
Asparagine synthetase in corn roots.
The level of asparagine synthetase is low in 10-mm root tips from corn seedings (Zea mays W64 x W182F) but relatively high in mature root sections taken 20 to 35 mm from the tip. When root tips are excised there is a marked increase in asparagine synthetase over a 5-hour period. In mature root sections, on the other hand, the asparagine synthetase activity declines over the same 5-hour period. ...
متن کاملKnockdown of Asparagine Synthetase A Renders Trypanosoma brucei Auxotrophic to Asparagine
Asparagine synthetase (AS) catalyzes the ATP-dependent conversion of aspartate into asparagine using ammonia or glutamine as nitrogen source. There are two distinct types of AS, asparagine synthetase A (AS-A), known as strictly ammonia-dependent, and asparagine synthetase B (AS-B), which can use either ammonia or glutamine. The absence of AS-A in humans, and its presence in trypanosomes, sugges...
متن کاملAsparagine synthesis in pea leaves, and the occurrence of an asparagine synthetase inhibitor.
Asparagine is present in the mature leaves of young pea (Pisum sativum cv Little Marvel) seedlings, and is synthesized in detached shoots. This accumulation and synthesis is greatly enhanced by darkening. In detached control shoots, [(14)C]aspartate was metabolized predominantly to organic acids and, as other workers have shown, there was little labeling of asparagine (after 5 hours, 3.1% of me...
متن کاملAsparagine synthetase polymorphisms and toxicity and efficacy of asparaginases.
Asparaginases develop innovative "tumor starvation" conditions for all antileukemia treatments; however, administrations are limited by the toxicities of this drug. Patients exhibiting moderate toxicity have optimal treatment outcomes. Certain asparagine synthetase polymorphisms may contribute to severe host toxicities in divergent subsets of patients, whereas others do not. Clinical correlatio...
متن کاملNovel Insights into Regulation of Asparagine Synthetase in Conifers
Asparagine, a key amino acid for nitrogen storage and transport in plants, is synthesized via the ATP-dependent reaction catalyzed by the enzyme asparagine synthetase (AS; EC 6.3.5.4). In this work, we present the molecular analysis of two full-length cDNAs that encode asparagine synthetase in maritime pine (Pinus pinaster Ait.), PpAS1, and PpAS2. Phylogenetic analyses of the deduced amino acid...
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ژورنال
عنوان ژورنال: Annual Review of Biochemistry
سال: 2006
ISSN: 0066-4154,1545-4509
DOI: 10.1146/annurev.biochem.75.103004.142520