Incidência de dentes primeiros pré-molares - PM1 - em equinos da cavalaria da PMMG

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Primary structure of the Streptomyces enzyme endo-beta-N-acetylglucosaminidase H.

We report the DNA and primary amino acid sequences of the Streptomyces plicatus enzyme endo-beta-N-acetylglucosaminidase H. Peptide sequence information was derived from enzyme isolated from Streptomyces culture medium using a combination of mass spectrometric methods and conventional techniques, including Edman degradation and carboxypeptidase Y digestion. The DNA sequence was determined by analysis of the Endo-beta-N-acetylglucosaminidase H gene cloned into the Escherichia coli plasmid pBR322 (Robbins, P. W., Wirth , D. F., and Hering , C. (1981) J. Biol. Chem. 256, 10640-10644). The enzyme from Streptomyces medium is 271 (or 269) amino acids in length and has a ragged NH2-terminal sequence beginning primarily with Ala-Pro-Val or Ala-Pro-Ala-Pro-Val. DNA resection experiments as well as the DNA sequence itself suggest that a proenzyme or, more probably, " prepro " enzyme may be the primary product of translation. The long 42 (or 44) residue leader sequence of the preproenzyme shows striking similarities to leader sequences found on proteins secreted by Bacillus species. The leader sequence is partially removed by E. coli and, as reported previously, endo-beta-N-acetylglucosaminidase H made in E. coli appears in both the periplasmic space and in the cell.

Expression of the Streptomyces enzyme endoglycosidase H in Escherichia coli.

Endoglycosidase H is one of a large number of enzymes secreted by Streptomyces plicatus and other Streptomyces species. When the structural gene for this enzyme is introduced into Escherichia coli attached to the plasmid pBR-322 or Charon 4 phage, the enzyme is synthesized and is found in the periplasmic space, culture medium, and cells. Attachment of the UV-5 lac promoter to a site in the plasmid adjacent to the Streptomyces insert stimulates enzyme synthesis as much as 100-fold. This result demonstrates that transcription of the Streptomyces gene can be initiated from sequences outside of the Streptomyces insert. Initiation of transcription on a Streptomyces promoter is also a suggested but unproven possibility. In contrast to the situation in Streptomyces, where the enzyme has a molecular weight of 27,000, the enzyme made in E. coli has a molecular weight of approximately 30,000. Possible explanations for this difference in size are lack of cleavage of the Streptomyces secretion "signal sequence" in E. coli or protein "processing" by enzymes secreted into the medium by STreptomyces.

[Duodenitis]. / Duodenitis.

In 211 bulboscopies 108 normal findings, 29 duodenal ulcers, 44 cases of scar bulb, 4 times erosions of the bulb and 26 times a bulbitis alone (macroscopically) were found. The macroscopic findings duodenitis were confirmed histologically in 85%, the macroscopic findings normal bulbous mucous membrane only in 30% of the cases. In patients with the histological findings duodenitis the bulbous mucous membrane was endoscopically regarded as normal in 70% of the cases. Patients with duodenitis more frequently have an antrum gastritis and less frequently a corpus gastritis than a control group corresponding to age without any macroscopic changes at the stomach and duodenal bulb. On account of its clinico-therapeutic importance is referred to the fact to demarcate the peptic corrosive bulbitis (bulbitis with bulboscopically probable lesion) from the bulbitis without bulboscopic lesion.