Highly purified p53 protein from different sources was able to degrade DNA with a 3'-to-5' polarity, yielding deoxynucleoside monophosphates as reaction products. This exonuclease activity was dependent on Mg2+ and inhibited by addition of 5 mM nucleoside monophosphates. This exonuclease activity is intrinsic to the wild-type p53 protein: it copurified with p53 during p53 preparation; only puri...

The phosphorus-proton nuclear Overhauser effect (NOE) was used to investigate the quantitative distribution of rotamers about the C3'-03' bond (&') of 3'-AMP and 2',3'-cyclic-CMP and the C4'-C5', C5' 05' bonds (41, 0) of 5'AMP. Phosphorus-proton and proton-proton NOE's were used to provide a qualitative insight into the backbone conformation and the glycosyl angle torsions of adenosylyl-(3' 5')...

Although it appears most probable that coenzyme A is a phosphate derivative of pantothenic acid (2), little information is available as to the position or nature of the phosphate linkage in the molecule. It became of interest in this connection to examine the properties of simple phosphate derivatives of pantothenic acid, and for this purpose efforts were directed toward the preparation of the ...

Condensation of the cis-diol of adenosine (1a) or guanosine (1b) with ethyl levulinate led to the acetal-esters 2a or 2b. Phosphorylation with phosphorous oxide trichloride converted them into their 5'-monophosphates. On alkaline hydrolysis the acetal-esters 2a,b as well as their 5'-monophosphates gave the carboxylic acid derivatives 3a,b and 4a,b, respectively. Condensation of these acid deriv...

The aim of this work is to establish a quantitative method to determine the ratio of [U-(13)C] labeled to unlabeled hexose monophosphates isolated from yeast extracts. This is accomplished by anion exchange chromatography and mobile phase desalting followed by electrospray (ESI) mass spectrometry. We test the method with the analysis of a sample of biological origin. Previously developed analyt...

A classification system is presented to distinguish 3 corn nucleases-Ribonuclease I, Ribonuclease II, and Nuclease I-which were described in the first paper of this series. The 2 ribonucleases are specific for RNA, are endonucleases, and liberate purine and pyrimidine cyclic nucleotides from dinucleotide monophosphates as well as from RNA. Ribonuclease I and II hydrolyze the purine cyclic nucle...

Anionic quantum dots (QDs) are spontaneously enfolded by coordination networks self-assembled from nucleotide monophosphates and lanthanide ions in water; luminescent core-shell nanoparticles are specifically obtained for anionic QDs, which allows their separation from amine-modified QDs.