Here we have a 3D model of a sequence that match with this sequence VVNIQKEIDRLNEVAKNLNESLIDLQELGKYEQYIK in Blast
the 3D structure is here
Why is there a chloride ion in this 3D model?
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It is a crystallisation artefact. Namely, the protein are placed in a condition where they fall out of solution without aggregating a gloop (as happens in most well in xstal trial) and to pack as a crystal they need to be placed nice and orderly. It is coordinated by water so is not relevant. A lot of structures have these —DMSO and ions are the most commonly.