This an EoI to try and get funding for crystallography work that was covered by previous Marsden bids (2018-2020). We were unsuccessful with the Marsden applications, so are now trying an MBIE Endeavor Program. The bid is for $1.5 M for 3 years, and would seek to get crystal structures for enzymes involved the biosynthesis of F430 and the activation of MCR. Methanogen marker proteins (10 of them) will also be targeted. The new structures would be become available to the PGGRC.