The phrase 'turning point role' is correct and usable in written English.
You can use it to refer to a situation or event that has the potential to cause a significant shift or change in a particular situation. For example, "The new mayor played a turning point role in revitalizing the city's economy."
The incident is now considered a turning point in the role of underground art in Soviet society.
Changes in the way hospital-based psychiatry is practiced led Dr. Rice to another turning point, and her current role on the Byram Hills school board.
The turning point came with his role as the caustic police inspector in Claude Chabrol's Que La Bête Meure (1969).
The turning point in both mayors' role in the dispute came late last month when Mr. Penelas, with Mr. Carollo beside him, revived the 37-year-old image of George Wallace, Alabama's segregationist governor, as they stood on the steps of the federal courthouse here to lash out at federal law and its enforcers.
Crawford later recalled the 2005 06 season as a turning point in Näslund's role as the offensive leader on the team, noting that Henrik and Daniel Sedin had surpassed him and Bertuzzi in that respect as the campaign progressed.
The loss of Srebrenica, which occurred shortly after the writerOs arrival in Bosnia, was psychologically devastating to the Bosnians, and it marked a turning point in the U.N.'s role in Bosnia.
Issues to be discussed will be the connection between Mad Men and Good Men, Fairey's view of whether manhood is indeed at a turning point in America, and the role of art and advertising in determining how we view ourselves as men.
The role is a turning point for Mr. Wilson, who describes himself as interested in religion though not particularly religious.
(Asked if this role marked the turning point between child star and adult actress, she dismissed it as "an arbitrary distinction").
It is to be noted that many researchers believe that the study of Brock et al. ([1992]) has played the role of a turning point in the history of TA.
This transcription factor may play an important role as a turning point into the maturation stage.
