Subcellular localization and sequence of sea urchin kinesin heavy chain: evidence for its association with membranes in the mitotic apparatus and interphase cytoplasm.
Kinesin was previously immunolocalized to mitotic apparatuses (MAs) of early sea urchin blastomeres (Scholey, J.M., M.E. Porter, P.M. Grissom, and J.R. McIntosh. 1985. Nature [Lond.]. 318:483-486). Here we report evidence that this MA-associated motor protein is a conventional membrane-bound kinesin, rather than a kinesin-like protein. Our evidence includes the observation that the deduced amino acid sequence of this sea urchin kinesin heavy chain is characteristic of a conventional kinesin. In addition, immunolocalizations using antibodies that distinguish kinesin from kinesin-like proteins confirm that conventional kinesin is concentrated in MAs. Finally, our immunocytochemical data further suggest that conventional kinesin is associated with membranes which accumulate in MAs and interphase asters of early sea urchin embryos, and with vesicles that are distributed in the perinuclear region of coelomocytes. Thus kinesin may function as a microtubule-based vesicle motor in some MAs, as well as in the interphase cytoplasm.
Wright
B D
BD
Department of Zoology, University of California, Davis 95616.
Henson
J H
JH
Wedaman
K P
KP
Willy
P J
PJ
Morand
J N
JN
Scholey
J M
JM
D000251:Adenosine Triphosphatases / Q000235:genetics / Q000378:metabolism*; D000595:Amino Acid Sequence; D000818:Animals; D000911:Antibodies, Monoclonal / Q000276:immunology; D015153:Blotting, Western; D002155:Calsequestrin / Q000378:metabolism; D002451:Cell Compartmentation; D002970:Cleavage Stage, Ovum; D003001:Cloning, Molecular; D004247:DNA / Q000235:genetics; D007399:Interphase; D007425:Intracellular Membranes / Q000378:metabolism*; D016547:Kinesins; D008870:Microtubules / Q000378:metabolism; D008969:Molecular Sequence Data; D015739:Nocodazole / Q000494:pharmacology; D010529:Peritoneal Cavity / Q000166:cytology; D015183:Restriction Mapping; D012617:Sea Urchins / Q000166:cytology / Q000648:ultrastructure; D008941:Spindle Apparatus / Q000378:metabolism* / Q000648:ultrastructure; D014404:Tubulin / Q000378:metabolism
D000911:Antibodies, Monoclonal; D002155:Calsequestrin; D014404:Tubulin; D004247:DNA; D000251:Adenosine Triphosphatases; D016547:Kinesins; D015739:Nocodazole