nifS NIFS_AZOVI Catalyzes the removal of elemental sulfur atoms from cysteine to produce alanine. Seems to participate in the biosynthesis of the nitrogenase metalloclusters by providing the inorganic sulfur required for the Fe-S core formation. 402 MADVYLDNNATTRVDDEIVQAMLPFFTEQFGNPSSLHSFGNQVGMALKKARQSVQKLLGAEHDSEILFTSCGTESDSTAILSALKAQPERKTVITTVVEHPAVLSLCDYLASEGYTVHKLPVDKKGRLDLEHYASLLTDDVAVVSVMWANNETGTLFPIEEMARLADDAGIMFHTDAVQAVGKVPIDLKNSSIHMLSLCGHKLHAPKGVGVLYLRRGTRFRPLLRGGHQERGRRAGTENAASIIGLGVAAERALQFMEHENTEVNALRDKLEAGILAVVPHAFVTGDPDNRLPNTANIAFEYIEGEAILLLLNKVGIAASSGSACTSGSLEPSHVMRAMDIPYTAAHGTVRFSLSRYTTEEEIDRVIREVPPIVAQLRNVSPYWSGNGPVEDPGKAFAPVYG Nitrogenase metalloclusters biosynthesis protein NifS Cysteine desulfurase