Mo. Rev. Stat. § 356.061
1. A professional corporation shall have the powers enumerated in the general business and corporation law of Missouri, chapter 351; except that, a professional corporation may:
(2) Be a promoter, general partner, stockholder, member, associate or manager only of a partnership, joint venture, professional corporation, foreign professional corporation, trust or other enterprise that is engaged only in:
(L. 1986 H.B. 1230)