This family of archaeal proteins represents the Energy-converting hydrogenase subunit EhaL [1,2]. Eha is the essential conduit of electrons from H2 and supports methanogenesis [1].

1: Essential anaplerotic role for the energy-converting hydrogenase Eha in hydrogenotrophic methanogenesis. Lie TJ, Costa KC, Lupa B, Korpole S, Whitman WB, Leigh JA; Proc Natl Acad Sci U S A. 2012;109:15473-15478. PMID:22872868

2: Methanobacterium thermoautotrophicum encodes two multisubunit membrane-bound [NiFe] hydrogenases. Transcription of the operons and sequence analysis of the deduced proteins. Tersteegen A, Hedderich R; Eur J Biochem. 1999;264:930-943. PMID:10491142