Microorganisms and methods for the biosynthesis of butadiene

A non-naturally occurring microbial organism, said microbial organism having a butadiene pathway and comprising at least one exogenous nucleic acid encoding a butadiene pathway enzyme expressed in a sufficient amount to produce butadiene, said butadiene pathway comprising converting crotonyl-CoA to crotyl-alcohol using one or more butadiene pathway enzymes, wherein said butadiene pathway enzymes are selected from the group consisting of a crotonyl-CoA reductase (aldehyde forming), a crotonaldehyde reductase (alcohol forming) a crotonyl-CoA hydrolase, synthetase, or transferase, a crotonate reductase, and a crotonyl-CoA reductase (alcohol forming).