MBHS_RHOCA Membrane-bound hydrogenase small subunit Uptake hydrogenase small subunit hupS hupA Hydrogenlyase 358 MSDIETFYDVMRRQGITRRSFMKSVRSPQHVLGLGPSFVPKIGEAMETKPRTPVVWVHGLECTCCSESFIRSAHPLAKDVVLSMISLDYDDTLMAAAGHAAEAAFEETIAKYKGNYILAVEGNPPLNEDGMFCITGGKPFVEKLRHAAEGAKAIISWGACASYGCVQAAAPNPTQATPVHKVITDKPIIKVPGCPPIAEVMTGVITYMLTFDRMPELDRQGRPAMFYSQRIHDKCYRRPHFDAGQFVEHWDDENARKGYCLYKMGCKGPTTYNACSTVPLERRRHFPIQSGHGCIGCSEDGFWDQGSFYDRLTTIKQFGIEATADQIGWTATGLVGAAVAAHAAVSVLKRAQKKNEEA This enzyme recycles the H(2) produced by nitrogenase to increase the production of ATP and to protect nitrogenase against inhibition or damage by O(2) under carbon- or phosphate-limited conditions.