scholarly journals ISOLATION AND REACTIVATION OF THE AXOSTYLE

1973 ◽  
Vol 56 (1) ◽  
pp. 13-26 ◽  
Author(s):  
Mark S. Mooseker ◽  
Lewis G. Tilney
Keyword(s):  
Molecular Weight ◽  
Sodium Dodecyl Sulfate ◽  
Atpase Activity ◽  
Adenosine Triphosphate ◽  
Sodium Dodecyl ◽  
Polyacrylamide Gels ◽  
Molecular Weights ◽  
Dodecyl Sulfate ◽  
Cilia And Flagella ◽  
Triton X

The contractile axostyle is a ribbon-shaped organelle present in certain species of flagellates found in the hindgut of wood eating insects. This organelle propagates an undulatory wave whose motion, like flagella and cilia, is related to microtubules. Unlike the axoneme of cilia and flagella, however, the axostyle is composed of singlet microtubules linked together in parallel rows. Axostyles were isolated from Cryptocercus gut protozoa with Triton X-100. Normal motility of the isolated axostyle could be restored with adenosine triphosphate (ATP); the specific conditions necessary for this reactivation were essentially identical with those reported for the reactivation of isolated flagella or whole sperm. ATPase activity of the isolated axostyle was comparable to the values reported for ciliary or flagellar axonemes. The axostyle was reasonably specific for ATP. Most of the proteins of the isolated axostyle comigrated with proteins of the ciliary axoneme on sodium dodecyl sulfate (SDS) polyacrylamide gels (i e. equivalent molecular weights). These included the following: the higher molecular weight component of dynein, tubulin, linkage protein (nexin), and various secondary proteins. Evidence for dynein in the axostyle is presented and a model proposed to explain how repeated propagated waves can be generated.

scholarly journals Transformation-deficient mutants of Bacillus subtilis impaired in competence-specific nuclease activities

1982 ◽  
Vol 152 (1) ◽  
pp. 166-174
Author(s):  
J A Mulder ◽  
G Venema
Keyword(s):  
Molecular Weight ◽  
Bacillus Subtilis ◽  
Sodium Dodecyl Sulfate ◽  
Sodium Dodecyl ◽  
Magnesium Ions ◽  
Polyacrylamide Gels ◽  
Wild Type ◽  
Molecular Weights ◽  
Defective Mutant ◽  
Mutant Strains

A comparison of the nucleolytic activities in competent and physiologically low-competent wild-type cultures of Bacillus subtilis in DNA-containing sodium dodecyl sulfate-polyacrylamide gels revealed the existence of three competence-associated nuclease activities with apparent molecular weights of 13,000, 15,000, and 26,000. The three activities, which were dependent on manganese or magnesium ions, were specifically present in the competent fraction of a competent culture. The competence-associated nucleolytic activities of eight transformation-defective mutant strains were assayed, resulting in the following three classes of mutants: (i) four strains which, according to this assay, were not impaired in any of the nucleolytic activities mentioned above; (ii) one strain which was strongly impaired in the 13,000- and 26,000-molecular-weight activities, but showed a considerable level of the 15,000-molecular-weight activity; and (iii) three strains which were severely impaired in all three activities. The results indicated that the 26,000-molecular-weight activity was a dimer of the 13,000-molecular-weight activity and that this nuclease was involved in the entry of DNA.

On the Evolution of an Oligocephalic Enzyme. Glutamine- Chorismate-Amidotransferase-Free Anthranilate Phosphoribosyltransferases from Mutant Strains of Salmonella typhimurium

1978 ◽  
Vol 33 (3-4) ◽  
pp. 235-244 ◽  
Author(s):  
Manfred Grieshaber
Keyword(s):  
Molecular Weight ◽  
Sodium Dodecyl Sulfate ◽  
Salmonella Typhimurium ◽  
Sodium Dodecyl ◽  
Single Component ◽  
Wild Type ◽  
Molecular Weights ◽  
Mutant Strains ◽  
Dodecyl Sulfate

(1) A procedure has been described for the purification of two glutamine-chorismate-amido- transferase-free anthranilate phosphoribosyltransferases from mutant strains TAX6trpR782 and trpAB1653trpR782 of Salmonella typhimurium.(2) The native enzymes tend to aggregate forming polymers of molecular weights 333,000 in the case of TAXtrpR782 and 220,000 and larger than 1X106 in the case of trpABI653trpR782. In the presence of sodium dodecyl sulfate the polymer of trpAB1653trpR782 dissociates into a single component with molecular weight of 72,000.(3) In contrast to anthranilate phosphoribosyltransferase of the wild type component II, the glutamine-chorismate-amidotransferase-free proteins do not complex with component I. They do however show catalytical similarities with the wild type with respect to anthranilate phosphoribosyltransferase activity.

scholarly journals Studies on the murine Ss protein. I. Purification, molecular weight, and subunit structure.

1975 ◽  
Vol 142 (3) ◽  
pp. 664-672 ◽  
Author(s):  
J D Capra ◽  
E S Vitetta ◽  
J Klein
Keyword(s):  
Molecular Weight ◽  
Sodium Dodecyl Sulfate ◽  
Sodium Dodecyl ◽  
Disulfide Bridge ◽  
Subunit Structure ◽  
Polyacrylamide Gels ◽  
Specific Antisera ◽  
Dodecyl Sulfate

The murine Ss protein has been isolated and purified. Using specific antisera, the radiolabeled protein has a mol wt of 120,000 in sodium dodecyl sulfate polyacrylamide gels. It is composed of two basic subunits of 23,000 and 14,000 daltons. The smaller molecular weight subunit contains a single disulfide bridge, is devoid of carbohydrate, and may represent the murine equivalent of beta2-microglobulin.

scholarly journals Identification of protein antigens of group B streptococci, with special reference to the Ibc antigens.

1984 ◽  
Vol 160 (5) ◽  
pp. 1476-1484 ◽  
Author(s):  
G J Russell-Jones ◽  
E C Gotschlich
Keyword(s):  
Molecular Weight ◽  
Sodium Dodecyl Sulfate ◽  
Sodium Dodecyl ◽  
Protein Antigens ◽  
Group B Streptococci ◽  
Molecular Weights ◽  
Immunochemical Staining ◽  
Group B ◽  
Triton X ◽  
Acid Labile

The protein antigens of prototypes of five types of group B streptococcal strains were extracted with HCl or Triton X-100, separated by sodium dodecyl sulfate polyacrylamide electrophoresis, transferred to nitrocellulose, and examined by immunochemical staining. The Ibc proteins are shown to consist of at least two distinct protein antigens and their breakdown products. One antigen, the "beta" antigen, exists primarily as a 130,000 mol wt protein that is also able to bind human IgA. The "alpha" antigen, which has no known function, appears as a number of proteins of various molecular weights from 20,000 to 120,000. Another set of antigens, the R protein antigens of type III strains, has been identified as a group of acid-labile proteins varying in molecular weight from 100,000 to 130,000. In addition, two previously undescribed antigens have been found that are common to all five group B types.

Solubility and adsorption behaviors of chlorophenols in the presence of surfactant

1997 ◽  
Vol 35 (7) ◽  
pp. 123-130 ◽  
Author(s):  
J. C. Liu ◽  
P. S. Chang
Keyword(s):  
Sodium Dodecyl Sulfate ◽  
Critical Micelle Concentration ◽  
Sodium Dodecyl ◽  
Adsorption Behaviors ◽  
Brij 35 ◽  
Important Index ◽  
Dodecyl Sulfate ◽  
Triton X

The solubility of chlorophenols as affected by surfactant was investigated. Three kinds of surfactant, sodium dodecyl sulfate, Triton X-100, and Brij 35, were utilized. The solubilization of chlorophenols by surfactant follows the order of 2,4,6-trichlorophenol > 2,4-dichlorophenol > 2,6-dichlorophenol > 2-chlorophenol; and the critical micelle concentration is an important index. The adsorption reactions of 2,4-dichlorophenol and 2,4,6- trichlorophenol onto hydrous montmorillonite in the presence of surfactant were examined. The presence of surfactant decreased the adsorption of chlorophenols significantly. The roles of hydrophobicity of chlorophenols in solubilization and adsorption behaviors are discussed.

Different submicellar solubilization mechanisms revealed by 1H NMR and 2D diffusion ordered spectroscopy (DOSY)

2020 ◽  
Vol 22 (19) ◽  
pp. 11075-11085
Author(s):  
Mengjian Wu ◽  
Zhaoxia Wu ◽  
Shangwu Ding ◽  
Zhong Chen ◽  
Xiaohong Cui
Keyword(s):  
Nmr Spectroscopy ◽  
Sodium Dodecyl Sulfate ◽  
1H Nmr ◽  
Sodium Dodecyl ◽  
Butyl Methacrylate ◽  
H Nmr ◽  
Molecular Scale ◽  
Two Systems ◽  
Dodecyl Sulfate ◽  
Triton X

Different submicellar solubilization mechanisms of two systems, Triton X-100/tetradecane and sodium dodecyl sulfate (SDS)/butyl methacrylate, are revealed on the molecular scale by 1H NMR spectroscopy and 2D diffusion ordered spectroscopy (DOSY).

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