6.3.2.33	700925	Glutathione synthetase homologs encode alpha-L-glutamate ligases for methanogenic coenzyme F420 and tetrahydrosarcinapterin biosyntheses	Proc. Natl. Acad. Sci. USA	100	9785-9790	2003	Methanocaldococcus jannaschii	http://www.ncbi.nlm.nih.gov/htbin-post/Entrez/query?uid=12909715&form=6&db=m