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Collagen‐like sequences stabilize homotrimers of a bacterial hydrolase.
Author(s) -
Charalambous B. M.,
Keen J. N.,
McPherson M. J.
Publication year - 1988
Publication title -
the embo journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 7.484
H-Index - 392
eISSN - 1460-2075
pISSN - 0261-4189
DOI - 10.1002/j.1460-2075.1988.tb03148.x
Subject(s) - pullulanase , biology , escherichia coli , gene , genetics , biochemistry , enzyme
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.