Proteins are the building blocks of cells of living creatures of all kingdoms. Due to pivotal role of protein structures in understanding evolutionary relationships and inferring their functions, the need to have a publically available databank was recognized and this results in establishment of protein data bank. This is a repository of protein structures in form of text files. Understanding and accessing protein structures in plain text files is very cumbersome job and a little bit difficult to understand the data as well. Several struggles have been made to transform protein structures of protein data bank in relational databases but all available relational databases of protein structures till now either do not provide complete information about the protein structures or they are not convenient to. Relational Protein Databank, presented in this paper, is a repository of all protein structures of protein databank stored in tables. A web interface has been provided to access various elements of protein structures in much more user friendly way. The structure of relational protein database has made data selection, insertion, deletion and editing very easy. RPDB is developed in MySQL which is an open source relational database management system.