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. 1988 Sep;7(9):2903–2909. doi: 10.1002/j.1460-2075.1988.tb03148.x

Collagen-like sequences stabilize homotrimers of a bacterial hydrolase.

B M Charalambous 1, J N Keen 1, M J McPherson 1
PMCID: PMC457085  PMID: 2846288

Abstract

Pullulanase from Klebsiella pneumoniae strain FG9 has an unusual N-terminal amino acid sequence that includes six repeats of the tripeptide Gly-X-Pro. This type of sequence is characteristic of animal collagens and collagen-like proteins which form triple helical structures. We have investigated the molecular organization of this bacterial pullulanase isolated from the cell surface of Escherichia coli cells that carry the cloned FG9 pulA (pullulanase encoding) gene. Non-denaturing polyacrylamide gel analysis shows that pullulanase exists as higher order, apparently homogeneous, structures. We have used highly purified bacterial collagenase to probe the role of the collagen-like region and we demonstrate that this feature is essential for non-covalent association of pullulanase homotrimers. In addition we show collagenase-specific release of cell-bound pullulanase.

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Selected References

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