His resignation came hours after reports surfaced that the party has sought an explanation from him over allegations of corruption levelled by some unidentified workers.
Shahrukh is learnt to have discontinued services of the private security agency that protected him and his house so far after senior police officials on Tuesday offered him police security cover.
Chatterjee said it was a matter of shame that this had happened while an inquiry was already on to look into the bribe-for-questions scandal.