Download MendeleyCrystal structure of a Hedgehog autoprocessing domain: homology between Hedgehog and self-splicing proteins.
Hall, T.M., Porter, J.A., Young, K.E., Koonin, E.V., Beachy, P.A., Leahy, D.J.(1997) Cell 91: 85-97
- PubMed: 9335337
- DOI: https://doi.org/10.1016/s0092-8674(01)80011-8
- Primary Citation of Related Structures:
1AT0 - PubMed Abstract:
The approximately 25 kDa carboxy-terminal domain of Drosophila Hedgehog protein (Hh-C) possesses an autoprocessing activity that results in an intramolecular cleavage of full-length Hedgehog protein and covalent attachment of a cholesterol moiety to the newly generated amino-terminal fragment. We have identified a 17 kDa fragment of Hh-C (Hh-C17) active in the initiation of autoprocessing and report here its crystal structure. The Hh-C17 structure comprises two homologous subdomains that appear to have arisen from tandem duplication of a primordial gene. Residues in the Hh-C17 active site have been identified, and their role in Hedgehog autoprocessing probed by site-directed mutagenesis. Aspects of sequence, structure, and reaction mechanism are conserved between Hh-C17 and the self-splicing regions of inteins, permitting reconstruction of a plausible evolutionary history of Hh-C and the inteins.
Organizational Affiliation:
Department of Biophysics and Biophysical Chemistry, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205, USA.
