Sunday, May 18, 2014

Creation Moment 5/19/2014 - Kinesins

....for I am fearfully and wonderfully made: Psalm 139:14
"Dr. Michael Denton is a biochemist, Senior Fellow with the Center for Science & Culture, and author of Evolution: A Theory in Crisis and Nature's Destiny: How the Laws of Biology Reveal Purpose in the Universe. He commented on kinesins, on exactly how they give evidence of design:


This wondrous mini-machine is one of dozens of different types of kinesin-like molecular motors in the cell, each adapted to carry different types of cargo around the interior of the cell. All these mini-motors consist of an exquisitely engineered arrangement of unique parts -- the motor heads, linker chains joining the two motor heads together and a relatively long tail linking the motor heads with the docking domains. Given the number of molecular components that must be exquisitely co-adapted to function together before any cargo could be carried along a microtubule in any conceivable cell, it is hard to escape the powerful impression that these wondrous mini-motors are the result of design rather than Darwinian evolution. Another set of molecular motors related to the kinesins are the myosins, which are responsible for muscle contraction. It is worth noting that putative primitive ancestral types of motors have never been identified in any extant cell -- and remarkably, from phylogenetic reconstructions, the earliest eukaryotic cells apparently had as diverse a set of complex motors as extant cells and no motors are known linking the kinesin  family to the myosin family or between the different classes of kinesins and myosins." EN&V

"The active movement of kinesins supports several cellular functions including mitosis, meiosis and transport
of cellular cargo, such as in axonal transport. Most kinesins walk towards the plus end of a microtubule, which, in most cells, entails transporting cargo from the centre of the cell towards the periphery. This form of transport is known as anterograde transport. In contrast, dyneins are motor proteins that move toward the microtubules' minus end." Wikipedia