In the exercise by the Commission of any jurisdiction under the Public Utility Holding Company Act of 1935 regarding the issue or sale, by any registered holding company or a subsidiary company thereof, of any security of such issuer or seller or of any other company to a person which is trustee under an indenture or indentures of such issuer or seller or other company, or of a subsidiary or associate company or affiliate of such issuer or seller or other company (whether or not such indenture or indentures are qualified or to be qualified under this subchapter), the fact that such trustee will thereby become a creditor, directly or indirectly, of any of the foregoing shall not constitute a ground for the Commission taking adverse action with respect to any application or declaration, or limiting the scope of any rule or regulation which would otherwise permit such transaction to take effect; but in any case in which such trustee is trustee under an indenture of the company of which it will thereby become a creditor, or of any subsidiary company thereof, this subsection shall not prevent the Commission from requiring (if such requirement would be authorized under the provisions of the Public Utility Holding Company Act of 1935) that such trustee, as such, shall effectively and irrevocably agree in writing, for the benefit of the holders from time to time of the securities from time to time outstanding under such indenture, to be bound by the provisions of this section, subsection (c) of section
77ooo of this title, and, in case of default (as such term is defined in such indenture), subsection (d) of section
77ooo of this title, as fully as though such provisions were included in such indenture. For the purposes of this subsection the terms “registered holding company”, “subsidiary company”, “associate company”, and “affiliate” shall have the respective meanings assigned to such terms in section 2(a) of the Public Utility Holding Company Act of 1935.