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. 1989 Sep;171(9):4667–4673. doi: 10.1128/jb.171.9.4667-4673.1989

Role of Myxococcus xanthus cell surface antigen 1604 in development.

B W Jarvis 1, M Dworkin 1
PMCID: PMC210265  PMID: 2504693

Abstract

The inhibition of development of Myxococcus xanthus by monoclonal antibody (MAb) 1604 has been further investigated with two MAbs produced against the affinity-purified cell surface antigen (CSA) 1604. Both of these second-generation MAbs, 4070 and 4054, reacted with the same band at 150 kilodaltons (kDa) on Western immunoblots of lysed and reduced cells. This band was also identified by MAb 1604. However, the affinity-purified CSA was a complex of the two proteins (51 and 23 kDa) and lipopolysaccharide (LPS) that the 150-kDa material comprised. One of the three MAbs, 4070, reacted with LPS on Western immunoblots. Another MAb, 4054, reacted with the 23-kDa protein, and MAb 1604 reacted with the 51-kDa protein found in the CSA complex. Competitive binding studies verified that MAbs 4054 and 1604 identified different epitopes, and MAb 4070 probably reacted with a third epitope of the CSA 1604 complex. MAb 4054 blocked development, although not as thoroughly as MAb 1604 did, when added at 60 micrograms/ml to cells undergoing submerged development. In contrast, MAb 4070 prevented sporulation in submerged development and induced the cells to reaggregate in rings around the initial aggregation centers. A mutant strain of M. xanthus that is deficient in the epitope for MAb 1604 retained the epitope for MAb 4054. The affinity-purified antigen 1604, when added to cells at greater than or equal to 550 ng/ml, altered the appearance of the fruiting bodies and at higher concentrations prevented fruiting body formation. The CSA 1604 moiety responsible for this inhibitory effect is apparently a peptide constituent and not the LPS.

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Selected References

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