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Cleavage of hemoglobin by hookworm cathepsin D aspartic proteases and its potential contribution to host specificity.
- Source :
-
FASEB journal : official publication of the Federation of American Societies for Experimental Biology [FASEB J] 2002 Sep; Vol. 16 (11), pp. 1458-60. Date of Electronic Publication: 2002 Jul 18. - Publication Year :
- 2002
-
Abstract
- Hookworms routinely reach the gut of nonpermissive hosts but fail to successfully feed, develop, and reproduce. To investigate the effects of host-parasite coevolution on the ability of hookworms to feed in nonpermissive hosts, we cloned and expressed aspartic proteases from canine and human hookworms. We show here that a cathepsin D-like protease from the canine hookworm Ancylosotoma caninum (Ac-APR-1) and the orthologous protease from the human hookworm Necator americanus (Na-APR-1) are expressed in the gut and probably exert their proteolytic activity extracellularly. Both proteases were detected immunologically and enzymatically in somatic extracts of adult worms. The two proteases were expressed in baculovirus, and both cleaved human and dog hemoglobin (Hb) in vitro. Each protease digested Hb from its permissive host between twofold (whole molecule) and sixfold (synthetic peptides) more efficiently than Hb from the nonpermissive host, despite the two proteases' having identical residues lining their active site clefts. Furthermore, both proteases cleaved Hb at numerous distinct sites and showed different substrate preferences. The findings suggest that the paradigm of matching the molecular structure of the food source within a host to the molecular structure of the catabolic proteases of the parasite is an important contributing factor for host-parasite compatibility and host species range.
- Subjects :
- Animals
Cathepsin D genetics
Cathepsin D physiology
Digestive System enzymology
Dogs
Hemoglobins chemistry
Host-Parasite Interactions
Humans
Models, Biological
Peptides chemistry
Recombinant Proteins metabolism
Species Specificity
Substrate Specificity
Ancylostomatoidea enzymology
Cathepsin D metabolism
Hemoglobins metabolism
Subjects
Details
- Language :
- English
- ISSN :
- 1530-6860
- Volume :
- 16
- Issue :
- 11
- Database :
- MEDLINE
- Journal :
- FASEB journal : official publication of the Federation of American Societies for Experimental Biology
- Publication Type :
- Academic Journal
- Accession number :
- 12205047
- Full Text :
- https://doi.org/10.1096/fj.02-0181fje