Abstract
Proteases regulate key events during infection by the pervasive intracellular parasite Toxoplasma gondii. Understanding how parasite proteases mature from an inactive zymogen to an active enzyme is expected to inform new strategies for blocking their actions. Herein, we show that T. gondii cathepsin B protease (TgCPB) does not undergo self-maturation but instead requires the expression of a second papain-family cathepsin protease, TgCPL. Using recombinant enzymeswealso show that TgCPL is capable of partially maturing TgCPB in vitro. Consistent with this interrelationship, antibodies with validated specificity detected TgCPB in the lysosome-like vacuolar compartment along with TgCPL. Our findings also establish that TgCPB does not localize to the rhoptries as previously reported. Accordingly, rhoptry morphology and rhoptry protein maturation are normal in TgCPB knock-out parasites. Finally, we show that although maturation of TgCPL is independent of TgCPB, it may involve an additional protease(s) in conjunction with self-maturation.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 3523-3534 |
| Number of pages | 12 |
| Journal | Journal of Biological Chemistry |
| Volume | 288 |
| Issue number | 5 |
| DOIs | |
| State | Published - Feb 1 2013 |
Fingerprint
ASJC Scopus subject areas
- Biochemistry
- Cell Biology
- Molecular Biology
Cite this
Non-canonical maturation of two papain-family Proteases in Toxoplasma gondii. / Dou, Zhicheng; Coppens, Isabelle; Carruthers, Vern B.
In: Journal of Biological Chemistry, Vol. 288, No. 5, 01.02.2013, p. 3523-3534.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Non-canonical maturation of two papain-family Proteases in Toxoplasma gondii
AU - Dou, Zhicheng
AU - Coppens, Isabelle
AU - Carruthers, Vern B.
PY - 2013/2/1
Y1 - 2013/2/1
N2 - Proteases regulate key events during infection by the pervasive intracellular parasite Toxoplasma gondii. Understanding how parasite proteases mature from an inactive zymogen to an active enzyme is expected to inform new strategies for blocking their actions. Herein, we show that T. gondii cathepsin B protease (TgCPB) does not undergo self-maturation but instead requires the expression of a second papain-family cathepsin protease, TgCPL. Using recombinant enzymeswealso show that TgCPL is capable of partially maturing TgCPB in vitro. Consistent with this interrelationship, antibodies with validated specificity detected TgCPB in the lysosome-like vacuolar compartment along with TgCPL. Our findings also establish that TgCPB does not localize to the rhoptries as previously reported. Accordingly, rhoptry morphology and rhoptry protein maturation are normal in TgCPB knock-out parasites. Finally, we show that although maturation of TgCPL is independent of TgCPB, it may involve an additional protease(s) in conjunction with self-maturation.
AB - Proteases regulate key events during infection by the pervasive intracellular parasite Toxoplasma gondii. Understanding how parasite proteases mature from an inactive zymogen to an active enzyme is expected to inform new strategies for blocking their actions. Herein, we show that T. gondii cathepsin B protease (TgCPB) does not undergo self-maturation but instead requires the expression of a second papain-family cathepsin protease, TgCPL. Using recombinant enzymeswealso show that TgCPL is capable of partially maturing TgCPB in vitro. Consistent with this interrelationship, antibodies with validated specificity detected TgCPB in the lysosome-like vacuolar compartment along with TgCPL. Our findings also establish that TgCPB does not localize to the rhoptries as previously reported. Accordingly, rhoptry morphology and rhoptry protein maturation are normal in TgCPB knock-out parasites. Finally, we show that although maturation of TgCPL is independent of TgCPB, it may involve an additional protease(s) in conjunction with self-maturation.
UR - http://www.scopus.com/inward/record.url?scp=84873295066&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84873295066&partnerID=8YFLogxK
U2 - 10.1074/jbc.M112.443697
DO - 10.1074/jbc.M112.443697
M3 - Article
VL - 288
SP - 3523
EP - 3534
JO - Journal of Biological Chemistry
JF - Journal of Biological Chemistry
SN - 0021-9258
IS - 5
ER -