The role of microtubule-based motor proteins in maintaining the structure and function of the Golgi complex. 1998

J K Burkhardt
Department of Pathology, The University of Chicago, 5841 S. Maryland Ave. MC1089, Chicago, IL 60637, USA. jburkhar@flowcity.bsd.uchicago.edu

The intimate association between the Golgi complex and the microtubule cytoskeleton plays an important role in Golgi structure and function. Recent evidence indicates that the dynamic flow of material from the ER to the Golgi is crucial to maintaining the integrity of the Golgi complex and its characteristic location within the cell, and it is now clear that this flow is dependent on the ongoing activity of microtubule motor proteins. This review focuses primarily on recent microinjection and expression studies which have explored the role of individual microtubule motor proteins in controlling Golgi dynamics. The collective evidence shows that one or more isoforms of cytoplasmic dynein, together with its cofactor the dynactin complex, are required to maintain a juxtanuclear Golgi complex in fibroblasts. Although questions remain about how dynein and dynactin are linked to the Golgi, there is evidence that the Golgi-spectrin lattice is involved. Kinesin and kinesin-like proteins appear to play a smaller role in Golgi dynamics, though this may be very cell-type specific. Moreover, new evidence about the role of kinesin family members continues to emerge. Thanks in part to recent advances in our understanding of these molecular motors, our current view of the Golgi complex is of an organelle in flux, undergoing constant renewal. Future research will be aimed at elucidating how and to what extent these motor proteins function as regulators of Golgi function.

UI MeSH Term Description Entries
D008869 Microtubule-Associated Proteins High molecular weight proteins found in the MICROTUBULES of the cytoskeletal system. Under certain conditions they are required for TUBULIN assembly into the microtubules and stabilize the assembled microtubules. Ensconsin,Epithelial MAP, 115 kDa,Epithelial Microtubule-Associate Protein, 115 kDa,MAP4,Microtubule Associated Protein,Microtubule Associated Protein 4,Microtubule Associated Protein 7,Microtubule-Associated Protein,Microtubule-Associated Protein 7,E-MAP-115,MAP1 Microtubule-Associated Protein,MAP2 Microtubule-Associated Protein,MAP3 Microtubule-Associated Protein,Microtubule Associated Proteins,Microtubule-Associated Protein 1,Microtubule-Associated Protein 2,Microtubule-Associated Protein 3,7, Microtubule-Associated Protein,Associated Protein, Microtubule,E MAP 115,Epithelial Microtubule Associate Protein, 115 kDa,MAP1 Microtubule Associated Protein,MAP2 Microtubule Associated Protein,MAP3 Microtubule Associated Protein,Microtubule Associated Protein 1,Microtubule Associated Protein 2,Microtubule Associated Protein 3,Microtubule-Associated Protein, MAP1,Microtubule-Associated Protein, MAP2,Microtubule-Associated Protein, MAP3,Protein 7, Microtubule-Associated,Protein, Microtubule Associated,Protein, Microtubule-Associated
D008870 Microtubules Slender, cylindrical filaments found in the cytoskeleton of plant and animal cells. They are composed of the protein TUBULIN and are influenced by TUBULIN MODULATORS. Microtubule
D003593 Cytoplasm The part of a cell that contains the CYTOSOL and small structures excluding the CELL NUCLEUS; MITOCHONDRIA; and large VACUOLES. (Glick, Glossary of Biochemistry and Molecular Biology, 1990) Protoplasm,Cytoplasms,Protoplasms
D004398 Dyneins A family of multi-subunit cytoskeletal motor proteins that use the energy of ATP hydrolysis, generated by a ring of AAA ATPASES in the dynein heavy chain, to power a variety of cellular functions. Dyneins fall into two major classes based upon structural and functional criteria. ATPase, Dynein,Adenosinetriphosphatase, Dynein,Dynein,Dynein ATPase,Dynein Adenosinetriphosphatase,Dynein Heavy Chain,Dynein Intermediate Chain,Dynein Light Chain,Dynein Light Intermediate Chain,Adenosine Triphosphatase, Dynein,Dynein Heavy Chains,Dynein Intermediate Chains,Dynein Light Chains,Dynein Light Intermediate Chains,Chain, Dynein Heavy,Chain, Dynein Intermediate,Chain, Dynein Light,Chains, Dynein Heavy,Chains, Dynein Intermediate,Chains, Dynein Light,Dynein Adenosine Triphosphatase,Heavy Chain, Dynein,Heavy Chains, Dynein,Intermediate Chain, Dynein,Intermediate Chains, Dynein,Light Chain, Dynein,Light Chains, Dynein
D006056 Golgi Apparatus A stack of flattened vesicles that functions in posttranslational processing and sorting of proteins, receiving them from the rough ENDOPLASMIC RETICULUM and directing them to secretory vesicles, LYSOSOMES, or the CELL MEMBRANE. The movement of proteins takes place by transfer vesicles that bud off from the rough endoplasmic reticulum or Golgi apparatus and fuse with the Golgi, lysosomes or cell membrane. (From Glick, Glossary of Biochemistry and Molecular Biology, 1990) Golgi Complex,Apparatus, Golgi,Complex, Golgi
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000072159 Dynactin Complex A multi-subunit protein of EUKARYOTIC CELLS. It functions in bidirectional intracellular transport of ORGANELLES and CYTOPLASMIC VESICLES by linking them to DYNEIN and KINESIN. 150 kDa Dynein-Associated Protein,Dynactin,Dynactin 1,Dynactin Subunit 1,Dynactin Subunit 2,Dynactin Subunit 3,Dynactin Subunit 4,Dynactin-2,Dynactin-3,Dynactin-4,Dynactins,Dynamitin Protein,Dynein Activator Protein,Dynein-Associated Protein, 150-kDa,p150(Glued),p22 Dynactin Light Chain,p50 Dynamitin,150 kDa Dynein Associated Protein,150-kDa Dynein-Associated Protein,Dynactin 2,Dynactin 3,Dynactin 4,Dynamitin, p50,Dynein Associated Protein, 150 kDa
D000818 Animals Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA. Animal,Metazoa,Animalia
D013049 Spectrin A high molecular weight (220-250 kDa) water-soluble protein which can be extracted from erythrocyte ghosts in low ionic strength buffers. The protein contains no lipids or carbohydrates, is the predominant species of peripheral erythrocyte membrane proteins, and exists as a fibrous coating on the inner, cytoplasmic surface of the membrane. alpha-Spectrin,beta-Spectrin,alpha Spectrin,beta Spectrin
D016547 Kinesins A family of microtubule-associated mechanical adenosine triphosphatases, that uses the energy of ATP hydrolysis to move organelles along microtubules including mitosis, meiosis, and axonal transport. Kinesin,Kinesin Heavy-Chain Protein,Kinesin Light-Chain Protein,Kinesin Light-Chain Proteins,Kinesin Superfamily,Heavy-Chain Protein, Kinesin,Light-Chain Protein, Kinesin,Light-Chain Proteins, Kinesin,Protein, Kinesin Heavy-Chain,Protein, Kinesin Light-Chain,Proteins, Kinesin Light-Chain,Superfamily, Kinesin

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