This happens, however, according to the reports, not frequently. Don't feel confused or desperate. Simply have a look at list below in order to see if your problem is there. Hopefully, you will find explanation and suggestions on making around the difficulty. If you have encountered something new, please help other SSM users by contacting us.

1. SSM says it cannot recognize mmCIF item in my file although it is PDB that I am trying tp upload!.
2. None from the above.

SSM says it cannot recognize mmCIF item in my file although it is PDB that I am trying to upload!

Take a closer look at first line of your file. In a valid PDB file, it should start with keyword HEADER. We understand that your software may generate incomplete, PDB-like, files, which miss many records in the annotation section. Therefore SSM's parser will identify your input as a PDB file if its first line contains any of the valid PDB keywords. If a PDB record is not recognizable, SSM's parser switches to mmCIF, and if first word in the file is not _data, an mmCIF error is reported.

If you are sure that first line in your file starts with a valid PDB keyword and SSM still issues you with an mmCIF error, please report this as a bug. You may also wish to visit the following link in order to see whether your PDB file is corrupted.

None from the above is my problem.

Ok, please help us and we'll do our best to help you: report your problem.