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. 1996 Jun;64(6):1929–1936. doi: 10.1128/iai.64.6.1929-1936.1996

The ActA polypeptides of Listeria ivanovii and Listeria monocytogenes harbor related binding sites for host microfilament proteins.

B Gerstel 1, L Gröbe 1, S Pistor 1, T Chakraborty 1, J Wehland 1
PMCID: PMC174018  PMID: 8675289

Abstract

The surface-bound ActA polypeptide of the intracellular bacterial pathogen Listeria monocytogenes acts as a nucleator protein, generating the actin cytoskeleton around intracellularly motile bacteria. In this work, we examined the functional similarity of ActA from Listeria ivanovii (iActA) ATCC 19119 to its L. monocytogenes counterpart. The amino acid sequence of iActA predicts a molecular mass of 123 kDa and harbors eight proline-rich repeats. For functional analysis, various iActA derivatives and hybrid constructs of L. ivanovii and L. monocytogenes ActA polypeptides were transiently expressed in epithelial cells and examined for recruitment of host microfilament proteins by a mitochondrial targeting assay. As has been demonstrated with ActA, iActA also spontaneously inserted into the surface of mitochondria and induced recruitment of actin, alpha-actinin, and the vasodilator-stimulated phosphoprotein (VASP) to these subcellular organelles. By comparison of amino-terminally truncated iActA derivatives for their ability to recruit cytoskeletal proteins, a region essential for actin filament accumulation was identified between amino acid residues 290 and 325. Such derivatives, however, retained their ability to bind VASP. Replacement of the proline-rich repeats in ActA with those of iActA also resulted in VASP recruitment. Hence, despite the limited overall sequence homology between ActA and iActA, the two molecules consist of at least two similar domains: a highly positively charged N-terminal domain that is directly involved in actin filament recruitment and a proline-rich repeat region required for VASP binding.

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Selected References

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