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1.
Hiroshi Kanazawa Toshiaki Kayano Tatsuya Kiyasu Masamitsu Futai 《Biochemical and biophysical research communications》1982,105(4):1257-1264
The 1855-nucleotide long DNA sequence of part of the gene cluster for the proton-translocating ATPase from was determined by the method of Maxam-Gilbert. The sequence covers the genes for the β and ε subunits of F1 along with the flanking region. The amino acid sequence of these subunits deduced from the nucleotide sequence indicates that the β and ε subunits have 459 and 138 amino acids, respectively. The possible secondary structure of the both subunits was estimated from the deduced primary structures. A possible nucleotide binding site in the β subunit is also discussed on the basis of the primary and secondary structures. The codons used in the genes for all the components of F1F0 were different in different genes, suggesting that the amount of each subunit in the F1F0 is determined to some extent on a translational level. 相似文献
2.
Nucleotide sequence of the genes coding for alpha, beta and gamma subunits of the proton-translocating ATPase of Escherichia coli 总被引:12,自引:0,他引:12
H Kanazawa T Kayano K Mabuchi M Futai 《Biochemical and biophysical research communications》1981,103(2):604-612
A nucleotide sequence of 2328 base pairs comprising a portion of the gene cluster for the proton-translocating ATPase of was determined. The sequence covers most of the gene for α subunit, the entire gene for γ subunit and the amino terminal portion of the gene for β subunit, along with the flanking regions of these genes. The amino acid sequences of these subunits deduced from the DNA sequences indicate that the α and γ subunits have 513 and 287 amino acid residues, respectively. A possible secondary structure for each subunit was estimated from the inferred primary structure. The intercistronic regions between the genes for α and γ and between γ and β are 49 and 26 base pairs, respectively. The significance of codon usage in these genes is discussed in correlation with their expression. 相似文献
3.
M Futai 《Biochemical and biophysical research communications》1977,79(4):1231-1237
The three major subunits (α, β and γ) of the coupling factor, F1 ATPase, of were separated and purified by hydrophobic column chromatography after the enzyme was dissociated by cold inactivation. The ability to hydrolyze ATP was reconstituted by dialyzing the mixture of subunits against 0.05 M Tris-succinate, pH 6.0, containing 2 mM ATP and 2 mM MgCl2. A mixture containing α, β and γ regained ATP hydrolyzing activity. Individual subunits alone or mixtures of any two subunits did not develop ATPase activity, except for a low but significant activity with α plus β. The reconstituted ATPase had a Km of 0.23 mM for ATP and a molecular weight by sucrose gradient density centrifugation of about 280,000. 相似文献
4.
Stimulation by interferon of induction of differentiation of human promyelocytic leukemia cells 总被引:3,自引:0,他引:3
F1-ATPase was isolated from yeast . The constituent subunits 1 and 2 were purified by gel permeation chromatography, and their amino acid compositions determined. Both subunits have a similar composition except for cystine, methionine, leucine, histidine, and tryptophan. When F1 is treated for three hours with 5′-p-[3H]fluorosulfonylbenzoyl adenosine in dimethylsulfoxide, 90% of the activity is lost. Disc gel electrophoresis of the modified complex showed that over 90% of the label was associated with subunit 2. A labelled peptide from a digest of subunit 2 was isolated and sequenced. It had the following amino acid sequence: His-Try1-Asp-Val-Ala-Ser-Lys-Val-Gln-Glu, whereby Tyr1 is the modified amino acid residue. This sequence shows homology to other sequences obtained from maize, beef heart, and F1-ATPases. 相似文献
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Trichinella spiralis: genetic basis for differential expression of phase-specific intestinal immunity in inbred mice 总被引:2,自引:0,他引:2
Responsiveness of mouse strains after phase-specific immunization with Trichinella spiralis is compared. Two strains () showed strong overall responsiveness. The response type could be characterized in phase-specific terms as: strongly anti-adult, weakly to moderately anti-preadult, and strongly antifecundity. By comparison, congenic mice of the C57B1 background (B10·A, B10·D2, B10·S, B10·Q) displayed poor total responses that could be characterized as: weakly anti-adult, very weakly anti-preadult, weakly anti-fecundity after preadult immunization, and mixed (weak and strong) after adult immunization. The mouse appeared to be intermediate between the B10·BR and the strains in overall responsiveness. Genetic determinants of anti-preadult or anti-adult responses of strain mice were dominant over their B10 congenic counterparts as shown in F1, crosses of × B1O·BR mice. Since the (predominantly H-2q) and the (H-2S) are both strong responders, while the B10·Q(H-2q) and B10·S (H-2S) are weak, it is suggested that the major genes controlling anti-preadult and anti-adult responses are not linked to the major histocompatibility complex. However, variations in anti-adult immunity and anti-fecundity in the B10 congenic mice (B10·Q and B10·S are the strongest responders) suggest that minor genes linked to the MHC exert some control over these responses. Some evidence was obtained for gene complementation as the F1 cross of and mice responded more vigorously than the parental lines. We conclude that multiple genes determine anti-T. spiralis intestinal responses in mice. The major genes are unlinked to the major histocompatibility complex whereas several minor genes are linked. 相似文献
8.
S D Dunn 《Biochemical and biophysical research communications》1978,82(2):596-602
ATPase activity was restored to the inactive coupling factor, F1ATPase, of strain AN120 () by reconstitution of the dissociated complex with an excess of wild-type α subunit. Large excesses of α gave the highest levels of activity. The other subunits which are required for the reconstitution of ATPase activity, β and γ, did not complement the mutant enzyme. These results indicate that the α polypeptide of the AN120 ATPase is defective. 相似文献
9.
Hiroaki Tokimatsu William A. strycharz Albert E. Dahlberg 《Journal of molecular biology》1981,152(2):397-412
Three forms of the 50 S ribosomal subunit of Escherichia coli have been separated by agarose/acrylamide gel electrophoresis. The slowest migrating form, S-50 S, corresponded to native 50 S subunits and contained four copies of proteins . Removal of the four copies of this protein produced a more rapidly migrating form, M-50 S. The M-50 S form was then converted to the fastest migrating form, F-50 S, by removal of additional proteins, including L10 and L11. A one-step removal of a pentameric complex of four copies of plus L10 converted the S-50 S subunit directly to the F-50 S subunit. These proteins recombined specifically with the appropriate protein-deficient 50 S subunit at 3 °C to reform the S-50 S subunit, i.e. the M-50 S subunit was converted back to the S-50 S form by the addition of purified proteins ; and the F-50 S subunit bound the pentameric complex of and L10 to form S-50 S. The binding of the pentameric complex, isolated by glycerol gradient centrifugation, supports the model that all four copies of proteins are together in one part of the ribosome called the “ stalk”. Only the four copies of were removed from the 50 S subunit in low salt (0.125 m-NH4Cl) plus 50% ethanol at 0 °C. These ribosomes (in the M-50 S form) had less than 5% of the peptide-synthesizing activity of untreated control ribosomes as measured by a poly(U) translation system in vitro. Peptide-synthesizing activity was restored, upon addition of , back to the treated ribosomes to give 50 S subunits (S-50 S) with a full complement of four copies of . Antibody to proteins bound only to the S-50 S subunits, producing four new bands separated by gel electrophoresis. The bands represented complexes of one, two, three and four antibodies bound to a 50 S subunit. This result was obtained using either 50 S subunits or 70 S tight couples and indicated that all four copies of are either located at a single site in the stalk or, much less likely, are divided between two symmetrical sites. Proteins were not only accessible to their specific antibody but could also be removed from 70 S ribosomes and polyribosomes without causing their dissociation into subunits. The ribosomes and polyribosomes had an increased gel electrophoretic mobility which was reversed by addition of proteins . 相似文献