Abstract:
:Kinetic analysis of the in vitro reconstitution of glyceraldehyde-3-phosphate dehydrogenase [D-glyceraldehyde-3-phosphate:NAD+ oxidoreductase (phosphorylating), EC 1.2.1.12] from yeast showed that both oxidized and reduced coenzyme enhance the transconformation reaction, which is rate limiting in the sequential folding-association process at high enzyme concentrations (Krebs, H., Rudolph, R. & Jaenicke, R. (1979) Eur. J. Biochem. 100, 359-364). In the present study the reconstitution of the enzyme has been analyzed after covalent modification with the coenzyme analog 3-[(3-bromoacetylpyridinio)-propyl]adenosine pyrophosphate. Reconstitution of the modified enzyme, as determined by the regain of the native tryptophan fluorescence, is found to be more then 10 times faster than refolding of the unmodified apoenzyme and more than 5 times faster than that of the unmodified holoenzyme. Various degrees of denaturation and the presence of up to 0.4 M guanidine . HCl do not affect the rate of reconstitution of the modified enzyme. The kinetic effect of free or covalently bound coenzyme is discussed in terms of a decrease in free energy of the native or native-like structure or in terms of a decreased activation energy of rate-limiting steps in the process of reconstitution. Stabilization of the dimeric intermediate or acceleration of its transformation seems to be the most likely explanation for the observed effect of free or covalently bound coenzyme on the rate of reconstitution.
journal_name
Proc Natl Acad Sci U S Aauthors
Jaenicke R,Krebs H,Rudolph R,Woenckhaus Cdoi
10.1073/pnas.77.4.1966subject
Has Abstractpub_date
1980-04-01 00:00:00pages
1966-9issue
4eissn
0027-8424issn
1091-6490journal_volume
77pub_type
杂志文章abstract::Host species have evolved mechanisms that can inhibit pathogen replication even after a cell has been successfully invaded. Here we show that tripartite-motif protein 21 (TRIM21), a ubiquitously expressed E3 ubiquitin ligase that targets viruses inside the cytosol, protects mice against fatal viral infection. Upon inf...
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