<?xml version="1.0" encoding="UTF-8"?><xmi:XMI xmlns:pos="http:///org/u_compare/shared/label/penn/pos.ecore" xmlns:grammatical="http:///org/u_compare/shared/label/penn/function/grammatical.ecore" xmlns:general="http:///org/u_compare/shared/label/penn/pos/general.ecore" xmlns:cas="http:///uima/cas.ecore" xmlns:stanford="http:///org/u_compare/shared/label/stanford.ecore" xmlns:semantic2="http:///uk/ac/nactem/semantic.ecore" xmlns:bioie="http:///org/u_compare/shared/label/penn/pos/bioie.ecore" xmlns:function="http:///org/u_compare/shared/label/penn/function.ecore" xmlns:tcas="http:///uima/tcas.ecore" xmlns:bio="http:///org/u_compare/shared/semantic/bio.ecore" xmlns:syntactic="http:///org/u_compare/shared/syntactic.ecore" xmlns:comparable="http:///org/u_compare/shared/comparable.ecore" xmlns:examples="http:///org/apache/uima/examples.ecore" xmlns:label="http:///org/u_compare/shared/label.ecore" xmlns:xmi="http://www.omg.org/XMI" xmlns:general2="http:///org/u_compare/shared/label/penn/bracket/general.ecore" xmlns:shared="http:///org/u_compare/shared.ecore" xmlns:fragment="http:///org/u_compare/shared/document/fragment.ecore" xmlns:document="http:///org/u_compare/shared/document.ecore" xmlns:bracket="http:///org/u_compare/shared/label/penn/bracket.ecore" xmlns:text="http:///org/u_compare/shared/label/penn/function/text.ecore" xmlns:structure="http:///org/u_compare/shared/document/structure.ecore" xmlns:text2="http:///org/u_compare/shared/document/text.ecore" xmlns:release="http:///org/u_compare/shared/label/penn/pos/release.ecore" xmlns:semantic="http:///org/u_compare/shared/semantic.ecore" xmlns:nontext="http:///org/u_compare/shared/document/nontext.ecore" xmlns:conll="http:///org/u_compare/shared/label/conll.ecore" xmlns:chemical="http:///org/u_compare/shared/semantic/chemical.ecore" xmlns:semantic3="http:///org/u_compare/shared/label/penn/function/semantic.ecore" xmlns:release2="http:///org/u_compare/shared/label/penn/bracket/release.ecore" xmlns:coindex="http:///org/u_compare/shared/label/penn/coindex.ecore" xmi:version="2.0"><cas:NULL xmi:id="0"/><cas:Sofa xmi:id="1" sofaNum="1" sofaID="_InitialView" mimeType="text" sofaString="A 12-cistron Escherichia coli operon (hyf) encoding a putative proton-translocating formate hydrogenlyase system. &#10;The nucleotide sequence has been determined for a twelve-gene operon of Escherichia coli designated the hyf operon (hyfABCDEFGHIR-focB). The hyf operon is located at 55.8-56.0 min and encodes a putative nine-subunit hydrogenase complex (hydrogenase four or Hyf), a potential formate- and sigma 54-dependent transcriptional activator, HyfR (related to FhlA), and a possible formate transporter, FocB (related to FocA). Five of the nine Hyf-complex subunits are related to subunits of both the E. coli hydrogenase-3 complex (Hyc) and the proton-translocating NADH:quinone oxidoreductases (complex I and Nuo), whereas two Hyf subunits are related solely to NADH:quinone oxidoreductase subunits. The Hyf components include a predicted 523 residue [Ni-Fe] hydrogenase (large subunit) with an N-terminus (residues 1-170) homologous to the 30 kDa or NuoC subunit of complex I. It is proposed that Hyf, in conjunction with formate dehydrogenase H (Fdh-H), forms a hitherto unrecognized respiration-linked proton-translocating formate hydrogenlyase (FHL-2). It is likely that HyfR acts as a formate-dependent regulator of the hyf operon and that FocB provides the Hyf complex with external formate as substrate. 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