Co-enzyme-

Many enzymes catalysed the reaction of their substrate only in the presence of a specific organic molecule called co-enzyme.
Co-enzyme frequently, B-vitamins as a part of their structure. Coenzymes are dialyzable organic compounds which are non covalently bound to enzyme protein and are responsible for the catalytic activity of several enzymes. Co-enzymes are generally derived from the water soluble vitamins and carry out ransfer of hydrogen or any other group of substarate in an enzimic reaction.