炼金石图纸:‘Of ’在此处的用法作何解释？

原句：Of particular interest has been the effect of contract violation,请问该句的第一个Of 是怎么用的，我怎么没见过这种语法规则
所在段落如下The concept of the psychological contract in its broadest sense has been in use for some time , but only recently has research attempted to specify and empirically examine what is implicit in terms of reciprocity and exchange within the employment relationship and the effect these beliefs have on key employee and organizational outcomes . Of particular interest has been the effect of contract violation, which occurs when an employee experiences adiscrepancy between the actual fulfillment of obligations by the organization and promisesmade about these obligations . Violation of the contract is thought to lead to feelings of anger, betrayal, and resentment which in turnleads to decreased employee motivation, dissatisfaction, loss of loyalty and exit from the organization . Inmost of this research, the source of the violation has involved significant organizational change, such as downsizing or redundancy. The role of work-life linkages in shaping perceptions of contract violation and employee obligations to the organization has receivedlittle empirical attention.
请高手指点，谢谢！