By Dr. Claudio O. Gualerzi, Dr. Cynthia L. Pon (auth.), Dr. Claudio O. Gualerzi, Dr. Cynthia L. Pon (eds.)
This ebook brings jointly quite a few contributions geared toward the elucida tion of the structural and useful association of the bacterial nucleoid. every one of these papers, spanning the fields of actual chemistry via biochemistry to genetics, have been offered on the consultation on bac terial chromatin through the Symposium "Selected issues on chromatin constitution and serve as" held on the college of Camerino, Italy, on the finish of could 1985. instances while the bacterial DNA used to be considered as "naked" or, at such a lot, complexed with polyamines, and whilst the absence of histones and arranged chromatin used to be thought of to be a special function of the professional karyotic phone, now seem distant. Our ideas of the way DNA is packaged in micro organism are altering speedily. stories at the constitution of the bacterial nucleoid will not be new. lately, in spite of the fact that, investigations during this box have flourished back, resulting in a few very important contributions reminiscent of the elucidation of the three-d constitution of what seems to be the main protein constituent of the bacterial nucleoid or the advance of the right way to titrate the level of DNA supercoiling in the bacterial cell.
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The binding of phosphate to the HI molecule changes the fluorescence quantum yield of the two tyrosine groups. This change is quite different from that observed when the NaCI concentration is increased. As shown in Fig 2, the quantum yield of the tyrosine fluorescence of the HI molecule is increased by NaCI to a value even greater than that expected for free tyrosine. This is an unusual finding, previously reported only for G. Geraci et al. 6 F, Fig. 2. Perturbation of the fluorescence of tyrosine residues of Chaetopterus v.
Mutants in gpB, gpC, gpgroEL, and gpNu3 all form aberrant structures such as polyheads, monsters and aberrant proheads, implicating the essential role of the initiation complex in proper assembly. The immature prohead is formed by condensation of gpE with the initiation complex in a reaction that depends on either the prior or coordinate assembly of gpNu3 into a scaffold structure. In the electron microscope, the prohead appears as a roughly spherical structure containing a protein scaffold core.
1983) give clear indications of the presence of cation-cation interactions mediated by a linking anion. The molecule, like other protamines, has a very simple amino-acid composition, shown in Table 1. When analyzed by gel ftltration on Sephadex columns at any salt concentration above 10 mM and at pH values between 3 and 9, it invariably shows a symmetrical peak, with an elution volume corresponding to a molecular weight of about 45 kD. 9 M acetic acid it shows an elution volume corresponding to 12 kD molecular weight.
Bacterial Chromatin by Dr. Claudio O. Gualerzi, Dr. Cynthia L. Pon (auth.), Dr. Claudio O. Gualerzi, Dr. Cynthia L. Pon (eds.)