Let me present two of the best friends of dr. Tveter

Be aware that you have a video about Kinesin on our web-page as well

Their names are  KINESIN and DYNEIN

The cells of our body have a skeleton consisting of three different kinds of fiber. The skeleton gives the cell stability and form. These fibers serve as transportation medium. Our cells also house some workers. These workers are protein motors with two legs, that can wander along the fibers of the cell skeleton. One such wanderer is called kinesin, walking from the nucleus toward the periphery of the cell. The worker walking in the opposite direction, toward the nucleus, is dynein. These two workers wander along the thickest fiber in the cell skeleton called microtubulus. Dynein has important functions in the development of the nervous system. A third work- er called Myosin, wanders along a thinner fiber, called actin. Myosin is found in large amounts in the musculature, and this motor is what lets our muscles work and contract. When a cell is going to divide and produce daughter cells,first the chromosomes will be dou- bled, and then pulled to each side of the cell. The cell is laced off in the middle, resulting in the forma- tion of two cells that are identical with the original cell. The chro- mosomes are pulled to each side by the workers we just mentioned. That means that these workers had to have existed in the first living cell, since they are needed in order for cell division to take place. After all, if the first cell could not divide, neither could it have resulted in continued life.

These workers collect waste at one place in the cell and transport it to a storage site. Other times they move organelles (small for- mations in the cell body). If the load is heavy, they will go together in pairs. Sometimes all three work- ers can collaborate. This collabo- ration presupposes exchange of information. They need to agree to help each other! Dynein has quite a nice construction. Its knee joints have an exchange system so it can change the walking pace, depending on how heavy the load is. None of us have gears in our knee joints, but dynein does, so we can allow ourselves to get excited. It is nothing less than fantastic! We can also wonder: How can these workers have come into being? Who saw the need our cells had for these workers? How can the skeleton fibers be made in such a way that these workers can find exact foundation for their feet? And we can continue to wonder: How do they know that they are to collect waste at a certain spot in the cell? How do they know to bring it to a specific place? How do they find their way there? How do they get the information that they need to help each other when the load gets heavy? How do they get information about their tasks? Consider these questions carefully, and ask yourself if you think it’s most reasonable that this activity has come about through coincidence, or if it is the result of planned and intelligent activity. Now we know that the fiber kinesin wanders along, comes into being as kinesin walks along it. It is synthesized all the way to the place where the load is to be delivered. When kinesin has reached that place, the fiber is broken down. A new fiber will be formed if kinesin collects a new load, and will lead kinesin to the right place for the second task. It is important that the skeleton fiber is broken down when kinesin has delivered the load at the right place. Otherwise, the cell would be filled with such fibers within a short period of time, resulting in no room for the other structures of the cell, which will face a sure death.