PMID: 9632627Jun 25, 1998Paper

Multigene families encoding the major hemagglutinins in phylogenetically distinct mycoplasmas

Infection and Immunity
A H NoormohammadiGlenn F Browning

Abstract

Mycoplasma synoviae has two major membrane antigens, MSPA and MSPB, both of which are phase variable and which may be coordinately involved in adhesion of the organism to erythrocytes. A single gene (vlhA) from M. synoviae was characterized, and polypeptides were expressed from nonoverlapping 5' and 3' regions in Escherichia coli. The expression product of the vlhA 5' region reacted with specific reagents against MSPB, while that of the 3' region reacted with specific reagents against MSPA. Analysis of the predicted amino acid sequence showed a characteristic signal peptidase II cleavage site, and the presence of the acylation site was confirmed by identification of a lipid-associated membrane protein, similar in molecular mass to MSPB, in [3H]palmitate-labelled membrane proteins. Further sequence analysis of the vlhA gene revealed a high identity with the Mycoplasma gallisepticum pMGA1.7 gene, a member of a large translated family. The vlhA gene was shown to hybridize to multiple restriction fragments of the M. synoviae genome, suggesting that it was also a member of a multigene family. These findings indicate that coordinate phase variation of the two major surface antigens of M. synoviae WVU may be due to their expression fr...Continue Reading

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Feb 21, 2003·Avian Pathology : Journal of the W.V.P.A·Dusan Bencina
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