>TIGR02191 RNaseIII ribonuclease III; InterPro: IPR011907 This family consists almost exclusively of bacterial examples of ribonuclease III (RNase III). This ubiquitous enzyme specifically cleaves double-stranded rRNA and is found in all bacteria and eukaryotes . In bacteria its main role is the processing of pre-rRNAs, where the large precursor ribosomal RNA molecules are at cleaved at specific sites to produce the immediate precursors of the functional molecules. RNase III also functions in the maturation and degradation of mRNAs, and the maturaton of tRNAs. In some organisms (eg. E. coli) cells are viable without this enzyme, though they are impeded in growth, but in others (eg. B. subtilis and M. genitalium) this enzyme is essential. The bacterial RNase III enzymes so far characterised are homodimers with a molecular mass of ~50 kDa , . The endonuclease domain is located within the N-terminal two-thirds of the protein, containing several alpha helices, but no beta strands. The double-stranded RNA binding domain is found at the C-terminal third of the protein, forming the alpha-beta(3)-alpha fold common to dsRNA-binding proteins. A signature box of 11 conserved amino acids found in the N-terminal region of RNase III may contain the active site, though this has not been proven.; GO: 0003723 RNA binding, 0004525 ribonuclease III activity, 0016075 rRNA catabolic process.

Probab=100.00 E-value=0 Score=487.46 Aligned_cols=215 Identities=45% Similarity=0.634 Sum_probs=205.7 Q ss_pred HHHHHCCCCCCHHHHHHHCCCHHHCCCCC-----CCHHHHHHHHHHHHHHHHHHHHHHHCCCCCHHHHHHHHHHHHHHHH Q ss_conf 99983696589899998424612126676-----6547788745868864547877641046887899888888874433 Q gi|254780940|r 9 LEKRIGYAFANRSLLEKALTHSSISHSYQ-----ESYERLEFLGDRILGLLISTLLFNHFDSAKEGELSVRFNSLVSAET 83 (227) Q Consensus 9 l~~~lgy~f~~~~ll~~A~th~S~~~~~~-----~~~erLEflGDavL~~~v~~~l~~~~p~~~eG~lt~lr~~lV~n~~ 83 (227) T Consensus 1 l~~~lg~~f~~~~lL~~ALTH~S~~ne~~~~~~~~~nERLEFLGDaVL~l~~~~~Lf~~~P~~~EG~Ls~~Ra~lV~~~~ 80 (228) T TIGR02191 1 LEKRLGYKFKNPELLEQALTHSSYANEHNESKKAKHNERLEFLGDAVLGLVVAEYLFKNFPDASEGELSKLRAALVSEES 80 (228) T ss_pred CHHHCCCCCCCHHHHHHHCCCCCHHHHHHCCCCCCCCHHHHHHHHHHHHHHHHHHHHHHCCCCCCCHHHHHHHHHHCHHH T ss_conf 90123888888899986201543233221146888511456788999999999999974789880258999998617488 Q ss_pred HHHHHH-HCCCCCEEEECCCCCCCCCCCCCCCCHHHHHHHHHHHHHCCC--CCCCHHHHHCCCCCCCCC--CCC-CCCCH Q ss_conf 454543-138772001036631237531333332669999999964155--422001221025643111--000-13452 Q gi|254780940|r 84 CSQVAR-ELDLASFIRVSSDLRKDVCSFMTSIQADVVESLIAALYLDGG--IEVAGTFVDKYWKQRALK--SGK-FRRDA 157 (227) Q Consensus 84 La~~a~-~lgl~~~l~~~~~~~~~~~~~~~~ilad~fEA~iGAiy~d~G--~~~~~~~i~~~~~~~~~~--~~~-~~~dp 157 (227) T Consensus 81 La~~A~~~~~L~~~l~LG~GE~~~gGr~r~siLaDa~EAliGAiYLD~G~e~~~a~~f~~~~~~~~~~~~~~~~~~~~D~ 160 (228) T TIGR02191 81 LAKVARKELGLGEYLLLGKGEEKSGGRRRDSILADAFEALIGAIYLDSGLELEAARKFILKLLIPRIDAIEKEEIAIKDY 160 (228) T ss_pred HHHHHHHHHCCCCEEEECHHHHHCCCCCCHHHHHHHHHHHHHHHHHCCCCCHHHHHHHHHHHHHHHHHHHHHHCCCCCCC T ss_conf 99999997188651542502543265442468999999999999841796689999999998999986655312456886 Q ss_pred HHHHHHHHHCCCCC-CCCCCEECCCCCCCCCEEEEEEEEC-CEEEEEEEECCHHHHHHHHHHHHHHHC Q ss_conf 58898753202233-3343101020778884599999999-989999996898999999999999974 Q gi|254780940|r 158 KTELQEWAHAKFGV-TPEYKVTFRSGPDHDPRFTVVVEIS-GLAPAQGMDCSKRAAEQVAAAEVLKRE 223 (227) Q Consensus 158 K~~Lqe~~q~~~~~-~P~Y~~~~~~g~~~~~~f~v~v~v~-g~~~g~g~g~SkK~Ae~~AA~~AL~kl 223 (227) T Consensus 161 Kt~LQE~~Q~~~~~~~P~Y~l~~~~Gp~H~~~F~v~V~~~~~~~~g~G~G~SKKeAEQ~AA~~al~~l 228 (228) T TIGR02191 161 KTALQEWAQARGKPELPEYRLIKEEGPDHDKEFTVEVSVNGGEPLGEGKGKSKKEAEQAAAKAALEKL 228 (228) T ss_pred CHHHHHHHHHCCCCCCCEEEEEECCCCCCCCEEEEEEEECCCEEEEEEEECCHHHHHHHHHHHHHHHC T ss_conf 31789999854887672488874147889965899999738757888751776899999999999829

HHsearch alignment for GI: 254780940 and conserved domain: TIGR02191