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PubMed2005

Mycoplasma gallisepticum hemagglutinin V1hA, pyruvate dehydrogenase PdhA, lactate dehydrogenase, and elongation factor Tu share epitopes with Mycoplasma imitans homologues.

Mycoplasma gallisepticum is a major pathogen of poultry. Mycoplasma imitans is genetically and antigenically closely related to M. gallisepticum, but so far, only a few proteins of M. imitans have been identified as sharing epitopes with M. gallisepticum. In this study, we identified three proteins of M. gallisepticum that share with M. imitans epitopes defined by monoclonal antibodies (MAbs). MAb 9D4 reacted with the 67-kD hemagglutinin V1hA (previously termed pMGA) of M. gallisepticum and with its continuously expressed 40-kD protein. This MAb also reacted with a 40-kD protein of M. imitans, but not with its putative V1hA. Two-dimensional (2D) immunoblots of M. gallisepticum strains showed that their 40-kD proteins reacting with MAb 9D4 are expressed as major forms with isoelectric points (pI) around 6, and also as less-abundant forms differing in pI. In M. imitans, major forms of 40-kD proteins recognized by MAb 9D4 had pI around 6, whereas minor forms had pI between 5.5 and 5.8. The N-terminal sequence of the M. gallisepticum 40-kD protein recognized by MAb 9D4 strongly indicates that this protein is pyruvate dehydrogenase E1, subunit alpha (PdhA protein, also termed AcoA). The position of elongation factor Tu (EF-Tu), detected by the reference MAb GB8, was very similar in the 2D proteome maps of M. gallisepticum and M. imitans (MW of about 45 kD; pI - 5.6). In both M. gallisepticum and M. imitans, MAb 7G1 reacted with proteins of about 36 kD with similar charges (major forms with pI of about 8). The position of this protein in the proteome map of M. gallisepticum and its N-terminal sequence strongly suggest that MAb 7G1 recognizes lactate (malate) dehydrogenase (Ldh or Mdh). Comparison of 2D proteomes of 10 M. gallisepticum strains indicated that positions of EF-Tu, PdhA, and Ldh proteins are rather consistent and can be used as reference points in further analyses of the M. gallisepticum proteome.

Amino Acid Sequence↗
PubMed1977

[Changes in hydroxybutyrate dehydrogenase and lactate dehydrogenase ratio after urologic operations].

In 58 patients subjected to urological surgery a statistically significant correlation was found between the repolarization disorder of ischaemic origin on the ECG and the changes in the alpha-HBDH/LDH ratio. After extensive interventions and particularly in aged subjects, the level of the LDH iso-enzyme of myocardial origin may rise without myocardial infarction. The rise is due to myocardial ischaemia, as proved by the ECG.

Aged↗
PubMedDate not supplied

[Isoenzyme characteristics of glucose-6-phosphage dehydrogenase and lactate dehydrogenase of continuous cells from the collection of the Sverdlovsk Research Institute of Virus Infections].

An analysis of isoenzymes of glucose-6-phosphage dehydrogenase (G-6-P-DH) and lactage dehydrogenase (LDH) of continuous cells from the collection of Sverdlovsk Research Institute of Virus Infections was carried out. Seventeen continous human and animal cell lines were examined by electrophoresis in a vertical block of 7% polyacrylamide gel followed by histochemical detection of the enzymes. The HEp-2, HEp-2 clone No. 23, KB, RH, and FL cells were shown to have the electrophoretic motility of G-6-PDG characteristic of HeLa cell line. LEP and SOC cell lines were contaminated with mouse cells. A culture of rat fibroblasts had isoenzymes of G-6-PDG and LDG characteristic of HeLa cell line. The remaining cell lines had the isoenzymatic characteristics corresponding to their species appurtenance.

Animals↗