The phrase "acting as surrogate" is correct and usable in written English.
It can be used in contexts where someone or something is taking the place of another, often in a supportive or representative role.
Example: "In this project, she is acting as surrogate for the team leader who is currently unavailable."
Alternatives: "serving as a substitute" or "functioning as a proxy".
Some will see this as another example of schools acting as surrogate parents, but I believe that as educators, we have a moral obligation to act.
We don't want ministers acting as surrogate corporate lobbyists.
In Dr. Goldstein's view, the SNPs could simply be acting as surrogate markers for the rare variants.
It features an unconventional love interest in Astrid the Genius – mistress of the wry putdown and austerely fond of starched white blouses – who is almost never available to Sam, the frustrated hero, because she's acting as surrogate mother to Little Pete, her autistic four-year-old brother.
On television later, Tim Pawlenty, the former governor of Minnesota who dropped out of the presidential race last summer, and who is now acting as surrogate for Romney, said, "there is one candidate in this race who has started a business, grown a business, and created jobs".
Thus, PES induced early stimuli, acting as surrogate EADs, imposed upon an arrhythmogenic substrate of ΔAPD90 to induce VT.
As such, whether directly influencing virus transmission or acting as surrogates for those factors, they act as a basis for a forecasting system to control and prevent rodent-borne diseases.
Heated discussions took place between a Comey deputy and an official in the Deputy Attorney General's office, acting as surrogates for their bosses.
All five Romney sons — Tagg, 42; Matt, 40; Josh, 37; Ben, 34 and Craig, 31 — will attend the Republican convention, acting as surrogates for their father.
In this case, the Whole Life Sisters, acting as surrogates of the company's customers, have caused the company to expend resources to deal with them and then more resources to devise a new strategy to accommodate the changed situation.
These helpers are stationed all over town, and acting as surrogates of Bobby's, bow to her everywhere she goes: "An epidemic of stealth bowing breaks out all over Bombay".
