I have two PDB files of the same protein (1st pdb contains the sequence from 5-28 amino acids and 2nd pdb the remaining seq). How can merge them together to give me one chain.
Open the files with a text editor and copy the content of the second file, then paste it into the first file. Or do it by copying the content of the first and the second file in a complete new file.
Use a molecular visualization software like Chimera: open both structures and then save the final merged file.
Use the terminal by concatenating both files using a pipe and redirecting the output to a new file.