TY - JOUR
T1 - Domain structure and function of dynamin probed by limited proteolysis
AU - Muhlberg, Amy B.
AU - Schmid, Sandra L.
PY - 2000/1/1
Y1 - 2000/1/1
N2 - Dynamin is a 100-kDa GTPase with multiple domains. Some of these have known functions, namely, the N-terminal GTPase domain, the PH domain that binds phosphatidylinositol lipids, and the C-terminal proline-arginine-rich domain (PRD) that binds to several SH3 domain-containing dynamin partners. Others, for example, the "middle" located between the GTPase domain and the PH domain and a predicted α-helical domain located between the PH domain and PRD, have unknown functions. Dynamin exists as a homotetramer in solution and self-assembles into higher-order structures resembling rings and helical stacks of rings. Dynamin self-assembly stimulates its GTPase activity. We used limited proteolysis to dissect dynamin's domain structure and to gain insight into intradomain interactions that regulate dynamin self-assembly and stimulate GTPase activity. We found that the PH domain functions as a negative regulator of dynamin self-assembly and stimulates GTPase activity and that the α-helical domain, termed GED for GTPase effector domain, is required for stimulated GTPase activity.
AB - Dynamin is a 100-kDa GTPase with multiple domains. Some of these have known functions, namely, the N-terminal GTPase domain, the PH domain that binds phosphatidylinositol lipids, and the C-terminal proline-arginine-rich domain (PRD) that binds to several SH3 domain-containing dynamin partners. Others, for example, the "middle" located between the GTPase domain and the PH domain and a predicted α-helical domain located between the PH domain and PRD, have unknown functions. Dynamin exists as a homotetramer in solution and self-assembles into higher-order structures resembling rings and helical stacks of rings. Dynamin self-assembly stimulates its GTPase activity. We used limited proteolysis to dissect dynamin's domain structure and to gain insight into intradomain interactions that regulate dynamin self-assembly and stimulate GTPase activity. We found that the PH domain functions as a negative regulator of dynamin self-assembly and stimulates GTPase activity and that the α-helical domain, termed GED for GTPase effector domain, is required for stimulated GTPase activity.
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U2 - 10.1006/meth.2000.0960
DO - 10.1006/meth.2000.0960
M3 - Article
C2 - 10720468
AN - SCOPUS:0034427058
VL - 20
SP - 475
EP - 483
JO - Methods in Enzymology
JF - Methods in Enzymology
SN - 0076-6879
IS - 4
ER -