The phrase "act as a cornerstone" is correct and usable in written English.
It can be used to describe something that serves as a fundamental or essential part of a larger structure or concept.
Example: "Education acts as a cornerstone of a successful society, providing individuals with the knowledge and skills they need to thrive."
Alternatives: "serve as a foundation" or "function as a key element".
Upon hearing the news, Mr. Trott said that he pitched Mr. Winkelried on having Mr. Buffett act as a "cornerstone investor" on the transaction.
Magnetic unmixing techniques are designed to perform this quantification and can, thus, act as a cornerstone for interpreting complex environmental magnetic data.
Engineering nanotopographies to elucidate the parameters causing a transition in the cell behavior may help the biomedical engineers to understand the modulation in the cellular behavior which may act as a cornerstone in designing implants with surface geometries which cause the cells to respond to them favorably.
A lower potential for an action with the dissipation property corresponds to a Helmholtz free energy function in classical mechanics; therefore, pseudo-potential acts as a cornerstone of the damage constitutive relationship.
Islington Council's decision to shut down a globally renowned nightclub, one which employed 250 people and acted as a cornerstone for the UK's electronic music industry, defies any logic or reason.
The IDCT acted as a cornerstone to both the intervention arms, but the number, type and intensity of IDCT related interventions varied depending upon the intervention arm.
By interacting not only with most of the system's inner (VirB6 and VirB8) and outer (VirB9 and VirB7) membrane components, but also with the ATPases powering the system (VirB4, VirB11 and VirD4) (Llosa et al, 2003; Atmakuri et al, 2004; Alvarez-Martinez and Christie, 2009; Jakubowski et al, 2009), VirB10 acts as a cornerstone of the T4S system architecture.
"It gave class and style to science fiction in the cinema, and that makes it the perfect film to act as the cornerstone of our festival when it is re-released nationally on Friday".
The inner WC particles which tightly connect the Si and graphene act as the cornerstone to resist large volumetric expansion of Si during charge/discharge, and in particular serve as the high-speed channels of electrons as well as provide more interface paths for Li+ to accelerate their transfer inside the Si.
Frances Perkins, President Roosevelt's close confidante, his Secretary of Labor, and the chair of his interagency task force that developed the Social Security legislation, wrote that Roosevelt "always regarded the Social Security Act as the cornerstone of his administration and, I think, took greater satisfaction from it than from anything else he achieved on the domestic front".
