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Query: UNIPROT:P06889 (Mol)
 630,302 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Fractionation of acid-soluble proteins from yeast Saccharomyces cerevisiae chromatin by gel electrophoresis suggested the existence of four histonestone fractions--H2a, H2b, H3, H4 and histone H1-like protein. The latter was isolated according to the second method of Johns and extracted with 5% HClO4. Amino acid analysis of the histone H1-like protein showed a moderately high content of basic amino acids, but a much lower ratio of lysine: arginine (approximately 3) than that of the hisone H1 from higher eukaryotes. In addition to histone H1-like protein a protein X was also extracted with 5% HC1O4. The sequence of the electrophoretic mobilities of histone fractions from yeast coincides with those of histone fractions from plants--H4 greater than H3 greater than H2a greater than H2b greater than H1.
Mol Biol (Mosk)
PMID:[Electrophoretic study of the acid soluble proteins of Saccharomyces cerevisiae yeast chromatin]. 35 66

It has been shown that in bacteria, besides specific regulatory mechanisms, the synthesis of aminoacid biosynthetic enzymes is also controlled by the endogenous aminoacid pool. The latter regulates the intracellular level of ppGpp, a positive effector of RNA messenger transcription. A similar regulatory control exists in yeast but does not appear to involve the same general effector. This was established by the observation that derepression of the enzymes belonging to several aminoacid biosynthetic pathways follows aminoacid starvation or tRNA discharging. We now report the repression of the arginine pathway by the total aminoacid pool. New mutations affecting the repressibility of the arginine enzymes as well as enzymes belonging to other aminoacid biosyntheses, when cells are grown in the presence of an excess of aminoacids, were identified.
Mol Gen Genet 1979 Jan 16
PMID:Concerted repression of the synthesis of the arginine biosynthetic enzymes by aminoacids: a comparison between the regulatory mechanisms controlling aminoacid biosyntheses in bacteria and in yeast. 37 2

A strain with both the polA12 and the alk-1 mutation is only slightly more sensitive to methyl methane sulfonate (MMS) than isogenic strains with only one of the mutations. On the other hand, alk-1 recA1 double mutant is much more sensitive to MMS than are strains carrying either one of alk or recA mutation. It was suggested that the alk and the polA gene products are involved in the same DNA repair process whereas the recA function is independent from the process. The yield of MMS-induced mutation (Arg- (argE) to Arg+ reversion) in alk mutant is considerably higher than that in wild type strain. Thus, the repair process in which the alk gene product is involved is relatively accurate. When MMS-treated lambda phages were plated on MMS-treated bacteria, there were considerable increases in survival of treated phage even in recA alk double mutant. It seems that a new repair pathway, which is specific for alkylating agent-induced damages and is not dependent on the RecA function, may be induced on exposure of bacteria to the alkylating agent.
Mol Gen Genet 1979 Mar 27
PMID:Pathways for repair of DNA damaged by alkylating agent in Escherichia coli. 37 12

The amino-acid compositions of the mitochondrial ribosomal subunits of Saccharomyces cerevisiae have been determined and compared to those of cytoplasmic ribosomal subunits. For the large subunits, the mitochondrial and cytoplasmic ribosomes showed major differences in the proportions of arginine, alanine and methionine. For the small subunits, arginine, aspartic acid, alanine, valine and methionine showed marked differences. We have compared these amino-acid compositions with those already published of bacterial and eukaryotic ribosomes by a statistical method of data analysis. It appeared clearly that the yeast mitoribosomes are more distant from bacterial ribosomes than from eukaryotic cytoribosomes.
Mol Gen Genet 1979 Mar 27
PMID:Comparison of amino acid compositions of mitochondrial and cytoplasmic ribosomal proteins of Saccharomyces cerevisiae. 37 18

Treatment of unanesthetized castrated adult male rats every 3 h for 48 h with either 5 microgram of arginine vasotocin (AVT) and/or 1 microgram luteinizing hormone-releasing hormone (LRH) caused a significant inhibition of plasma levels of luteinizing hormone (LH) and compared to castrated control rats receiving diluent only. However, the intravenous (iv) injection of 1 microgram of AVT into urethane-anesthetized male rats which had been castrated for 0, 24 or 48 h did not affect plasma levels of LH at 10, 20 or 60 min following injection compared to their respective diluent-treated castrated control rats. Similarly, the iv injection of either 100 ng, 1 microgram or 10 microgram AVT was unable to acutely affect plasma levels of LH in intact male rats. Following the iv injection of 2 doses of 50 ng LRH spaced 1 h apart in anesthetized castrated male rats, 2 peaks of equal magnitude in plasma LH were noted. Castrated rats treated with 2 injections spaced 1 h apart of LRH + AVT had significantly higher plasma levels of LH than did rats treated with LRH alone. In subsequent studies, both AVT and arginine vasopressin were observed to augment the plasma response of LH to an injection of LRH whereas oxytocin had no effect. A single injection of AVT + LRH significantly augmented the plasma titers of LH compared to levels observed in LRH-treated control rats as did a second injection 1 h later. The administration of cyproterone acetate sc for 2 days by itself had no effect on plasma LH but in conjunction with LRH caused a marked rise in plasma LH compared to intact rats treated with LRH alone. AVT in combination with LRH and cyproterone acetate caused a significant elevation in plasma LH at 60 min post-injection when compared to plasma levels of rats treated with LRH alone or the combination of LRH and cyproterone acetate. It is concluded that acute intravenous injections of AVT augment the LH-releasing activity of LRH; chronic treatment for 48 h, however, with LRH + AVT leads to a significant depression of plasma LH perhaps due to an exhaustion of the releasable pool of LH in the anterior pituitary.
Mol Cell Endocrinol 1979 Apr
PMID:Interaction of luteinizing hormone-releasing hormone, cyproterone acetate and arginine vasotocin on plasma levels of luteinizing hormone in intact and castrated adult male rats. 37 36

The influence of modification of Phe-RSase from E. coli MRE-600 by lysine- and arginine-specific reagent 2,4-pentandione on the Phe-RSase.tRNAPhe interactions was investigated. It was shown that modification of Phe-RSase with 2,4-pentandion leads to a decrease of the aminoacylation rate without any influence on the value of Km for tRNAPhe in this reaction and only a slight increase of the value of Kdiss for Phe-RSase.tRNAPhe complex. The log Km (Km-1)--ionic strength dependence for native enzyme and log Kdiss (K-1diss) for native enzyme and two forms modified on arginine and lysine residues were investigated. Results were interpreted quantitatively by Debye--Huckel approximation for two spherical macroions and by Daune approximation assuming that the region of tRNA implicated in ionic interactions is locally a cylindrical polyelectrolyte. It was shown that there are 2-4 electrostatic contacts in Phe-RSase.tRNAPhe interactions in limits of both approximations; modification of arginine residues in Phe-RSase doesn't change the number of electrostatic contacts, modification of lysine residues leads to an increase in the number of contacts. It was assumed that there are lysine residues in Phe-RSase essential for the tRNAPhe recognition. The possibility of participation of negative amino acid residues in electrostatic interactions with tRNAPhe is not excluded.
Mol Biol (Mosk)
PMID:[Influence of the modification of Phe-tRNA synthetase from Escherichia coli by lysine- and arginine-specific reagent on the ionic interactions of the enzyme with tRNA Phe]. 38 96

The functions of a number of amino acid residues in proteins have been studied by chemical modification techniques and much useful information has been obtained. Methods using dicarbonyl compounds for the modification of arginine residues are the most recent to have been developed. Since their introduction about 10 years ago, they have led to the identification of a large number of enzymes and other proteins that contain arginine residues critical to biological function. These reagents are discussed in terms of their chemical reactivity and mechanisms of action and in relation to the unique chemical properties of the guanidinium group. Butanedione, phenylglyoxal and cyclohexanedione are the most commonly employed arginyl reagents, and their relative advantages are examined. A survey of the functional role of arginine residues in enzymes and other proteins is presented in which nearly 100 examples are cited. The prediction that arginine residues would be found to serve a general role as anionic binding sites in protein has obviously been validated. The genetic and physiological implications of the selection of arginine for this important function are discussed.
Mol Cell Biochem 1979 Jul 31
PMID:Arginyl residues and anion binding sites in proteins. 38 84

We have analyzed some chemical properties of the sigma subunit of RNA polymerase from the sigma mutants: rpoD1 (Gross et al., 1978), rpoD2 (formerly known as alt-1) (Silverstone et al., 1972; Travers et al., 1978), and rpoD800 (Gross et al., 1979). Each of the three mutants is located at about 66 min on the E. coli genetic map and exhibits an alteration in the enzymatic properties of its sigma subunit. The tryptic peptides and isoelectric focusing behavior were analyzed for mutant and wild type sigma. A single, but different altered lysine tryptic peptide was observed for each mutant. No altered arginine tryptic peptides were observed. The rpoD800 mutant sigma showed an altered isoelectric point. These studies provide chemical evidence that the sigma polypeptide in all three mutants is altered and strongly support the conclusion that the mutations are in the structural gene for sigma.
Mol Gen Genet 1979 Oct 01
PMID:Altered chemical properties in three mutants of E. coli RNA polymerase sigma subunit. 39 26

Six loci coding for arginine biosynthetic enzymes in Pseudomonas aeruginosa strain PAO were identified by enzyme assay: argA (N-acetylglutamate synthase), argB (N-acetylglutamate 5-phosphotransferase), argC (N-acetylglutamate 5-semialdehyde dehydrogenase), argF (anabolic ornithine carbamoyl-transferase), argG (argininosuccinate synthetase), and argH (argininosuccinase). One-step mutants which had a requirement for arginine and uracil were defective in carbamoylphosphate synthase, specified by a locus designated car. To map these mutations we used the sex factor FP2 in an improved interrupted mating technique as well as the generalized transducing phages F116L and G101. We confirmed earlier studies, and found no clustering of arg and car loci. However, argA, argH, and argB were mapped on a short chromosome segment (approx. 3 min long), and argF and argG were cotransducible, but not contiguous. N-Acetylglutamate synthase, the enzyme which replenishes the cycle of acetylated intermediates in ornithine synthesis of Pseudomonas, appears to be essential for arginine synthesis since argA mutants showed no growth on unsupplemented minimal medium.
Mol Gen Genet 1977 Jul 07
PMID:The genetic organization of arginine biosynthesis in Pseudomonas aeruginosa. 40 99

Specific radioactive enzyme assays were developed to measure the effect of growth hormone on kidney transamidinase and liver methyltransferase in the hypophysectomized rat. In contrast to minimal changes (20%) in liver methyltransferase, kidney transamidinase was decreased threefold in the hypophysectomized rat. Enzyme activities were equal to normal values in those rats receiving growth hormone for three days. The formation of creatine from radioactive precursors and the uptake of 14C-creatine in muscle was examined under these conditions. After injection of 14C-arginine in the hypophysectomized rat, the 14C-creatine content of muscle was greatly decreased compared to sham operated controls and the 14C-creatine content was normal after growth hormone administration. After injection of 14C-guanidoacetate and of 14-creatine, the 14C-creatine content of muscle was decreased in the hypophysectomized rat, but was equal to sham control values in rats receiving growth hormone. These studies indicate that the uptake of newly synthesized creatine by muscle is impaired in the hypophysectomized rat and that growth hormone can have a role in controlling the rate of creatine uptake by muscle in addition to its effect on kidney transamidinase and to other factors involved in creatine metabolism.
Mol Cell Biochem 1979 May 21
PMID:Growth hormone effects on creatine uptake by muscle in the hypophysectomized rat. 46 Jan 77


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