Hi Chandan,
The closest sodium-sulfur interaction that I know of within a protein is in entry 2BDG, Na (Atom 402, Chain A) to a CYS with a distance of 3.3 Angstroms. A couple of examples exist of sodium-sulfur interactions that involve coenzyme A (1FY7 and 1MJ9). I hope that helps.
Take Care,
Sean
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