There are hyperthermophiles which can survive at heats of 235 degrees F, even to the point that they can still reproduce at these temperatures. One of the major aspects of survival is withstanding the denaturing of proteins. These organisms have very unique structures. Really, common sense is almost useless when trying to grasp how these organism thrive at temperatures above the boiling point of water. We just have to go on the facts. Yup it seems pretty weird, and it's true.