Effects of mutant rat dynamin on endocytosis.
Dynamin is a 100-kD microtubule-activated GTPase. Recent evidence has revealed a high degree of sequence homology with the product of the Drosophila gene shibire, mutations in which block the recycling of synaptic vesicles and, more generally, the formation of coated and non-coated vesicles at the plasma membrane. We have now transfected cultured mammalian COS-7 cells with both wild-type and mutant dynamin cDNAs. Point mutations in the GTP-binding consensus sequence elements of dynamin equivalent to dominant negative mutations in ras, and an NH2-terminal deletion of the entire GTP-binding domain of dynamin, block transferrin uptake and alter the distribution of clathrin heavy chain and alpha-, but not gamma-, adaptin. COOH-terminal deletions reverse these effects, identifying this portion of dynamin as a site of interaction with other components of the endocytic pathway. Over-expression of neither wild-type nor mutant forms of dynamin affected the distribution of microtubules. These results demonstrate a specific role for dynamin and for GTP in the initial stages of receptor-mediated endocytosis.
Herskovits
J S
JS
Worcester Foundation for Experimental Biology, Shrewsbury, Massachusetts 01545.
Burgess
C C
CC
Obar
R A
RA
Vallee
R B
RB
D033965:Adaptor Protein Complex alpha Subunits; D033942:Adaptor Proteins, Vesicular Transport; D000595:Amino Acid Sequence; D000818:Animals; D000906:Antibodies / Q000276:immunology; D017301:Ca(2+) Mg(2+)-ATPase / Q000737:chemistry / Q000235:genetics / Q000276:immunology / Q000502:physiology*; D002460:Cell Line; D002966:Clathrin / Q000032:analysis / Q000276:immunology; D029721:Drosophila Proteins; D034281:Dynamins; D004705:Endocytosis; D006160:Guanosine Triphosphate / Q000378:metabolism; D008856:Microscopy, Fluorescence; D008969:Molecular Sequence Data; D009154:Mutation; D011506:Proteins / Q000032:analysis / Q000276:immunology; D051381:Rats; D014162:Transfection
D033965:Adaptor Protein Complex alpha Subunits; D033942:Adaptor Proteins, Vesicular Transport; D000906:Antibodies; D002966:Clathrin; D029721:Drosophila Proteins; D011506:Proteins; D006160:Guanosine Triphosphate; D017301:Ca(2+) Mg(2+)-ATPase; D034281:Dynamins; C439628:shi protein, Drosophila