The function of the other proteins is not yet clear:
Bacterial protein cysQ. CysQ could help to control the pool of PAPS
(3'-phosphoadenoside 5'-phosphosulfate), or be useful in sulfite synthesis.
Neurospora crassa protein Qa-X. Probably involved in quinate metabolism.
Emericella nidulans protein qutG. Probably involved in quinate metabolism.
Yeast protein HAL2/MET22  involved in salt tolerance as well as
Yeast hypothetical hypothetical protein YHR046c.
Caenorhabditis elegans hypothetical protein F13G3.5.
It is suggested  that these proteins may act by enhancing the synthesis or
degradation of phosphorylated messenger molecules. From the X-ray structure of
human inositol monophosphatase , it seems that some of the conserved
residues are involved in binding a metal ion and/or the phosphate group of the
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