Top3a

DNA topoisomerase 3-alpha

1003 amino acids

Releases the supercoiling and torsional tension of DNA introduced during the DNA replication and transcription by transiently cleaving and rejoining one strand of the DNA duplex. Introduces a single-strand break via transesterification at a target site in duplex DNA. The scissile phosphodiester is attacked by the catalytic tyrosine of the enzyme, resulting in the formation of a DNA-(5'-phosphotyrosyl)-enzyme intermediate and the expulsion of a 3'-OH DNA strand. The free DNA strand then undergoes passage around the unbroken strand thus removing DNA supercoils. Finally, in the religation step, the DNA 3'-OH attacks the covalent intermediate to expel the active-site tyrosine and restore the DNA phosphodiester backbone. As an essential component of the RMI complex it is involved in chromosome separation and the processing of homologous recombination intermediates to limit DNA crossover formation in cells. Has DNA decatenation activity. It is required for mtDNA decatenation and segregation after completion of replication, in a process that does not require BLM, RMI1 and RMI2.

Belongs to the type IA topoisomerase family.

112.358 kDa

MIFPVTLLAFQWHRRPGGRALSRAAMEVAFRGVRKVLCVAEKNDAAKGIADLLSNGRMRRKEGLSKFNKIYEFDYHLYGQNVTMIMTSVSGHLLAHDFQMQFRKWQSCNPLVLFEAEIEKYCPENFIDIKKTLERETHHCQALVIWTDCDREGENIGFEIIHVCKAVKPNLRVLRARFSEITPHAVRTACENLTEPDQRVSDAVDVRQELDLRIGAAFTRFQTLRLQRIFPEVLAEQLISYGSCQFPTLGFVVERFKAIQAFVPEVFHKIKVTHDHKDGTVEFNWKRYRLFNHTACLVLYQLCMEDPMATVVEVRSKPKSKWRPQALDTVELEKLASRKLRINAKETMRIAEKLYTQGYISYPRTETNIFPKDLNLVALVEQQTVDPHWGAFAQTILERGGPTPRNGSKSDQAHPPIHPTKYTSGLQGDDRRLYEFIVRHFLACCSQDAQGQETTVEIDIAQERFVAHGLIILARNYLDVYPYDHWSDKLLPVYEQGSHFQPSTVEMVDGETSPPQLLTEADLIALMEKHGIGTDATHAEHIETIKARMYVGLTSDKRFLPGHLGMGLVEGYDSMGYEMSKPDLRAELEADLKLICEGKKDKFQVLRQQVQKYKQVFIEAVAKAKKLDEALSQYLGERTEMAQQEEIYPAMPEPVRKCPQCNKDMVLKTKKSGGFYLSCMGFPECRSAVWFPDSVLEASRDNSVCSVCQPPPVYRLKLKFKRGSLPPAMPLEFVGCIGGCDETLKEIFGLRFPRALPRASQPSGHLQASQALNRMDSSQHNLSQPLVNRHTRPSKTVAQALLPPTTAGESNSVTCNCGREAVLLTVRKQGPNQGRHFYKCSNGDCNFFLWADSSHSTGGGTPTSASGPPGSSVGCPSSVGSHMDGFGSLGSDSDGGTPCLCGQPAVTRTVQKDGPNKGRQFHTCAKPREQQCGFFQWVDENVAPGSFAAPAWPGGRGKAQRPEAASKRPRAGSSDAGSTVKKPRKCSLCHQPGHTRTFCPQNR

TOP3A

DNA topoisomerase 3-alpha

1001 amino acids

Releases the supercoiling and torsional tension of DNA introduced during the DNA replication and transcription by transiently cleaving and rejoining one strand of the DNA duplex. Introduces a single-strand break via transesterification at a target site in duplex DNA. The scissile phosphodiester is attacked by the catalytic tyrosine of the enzyme, resulting in the formation of a DNA-(5'-phosphotyrosyl)-enzyme intermediate and the expulsion of a 3'-OH DNA strand. The free DNA strand then undergoes passage around the unbroken strand thus removing DNA supercoils. Finally, in the religation step, the DNA 3'-OH attacks the covalent intermediate to expel the active-site tyrosine and restore the DNA phosphodiester backbone. As an essential component of the RMI complex it is involved in chromosome separation and the processing of homologous recombination intermediates to limit DNA crossover formation in cells. Has DNA decatenation activity (PubMed:30057030). It is required for mtDNA decatenation and segregation after completion of replication, in a process that does not require BLM, RMI1 and RMI2 (PubMed:29290614).

Belongs to the type IA topoisomerase family.

112.372 kDa

MIFPVARYALRWLRRPEDRAFSRAAMEMALRGVRKVLCVAEKNDAAKGIADLLSNGRMRRREGLSKFNKIYEFDYHLYGQNVTMVMTSVSGHLLAHDFQMQFRKWQSCNPLVLFEAEIEKYCPENFVDIKKTLERETRQCQALVIWTDCDREGENIGFEIIHVCKAVKPNLQVLRARFSEITPHAVRTACENLTEPDQRVSDAVDVRQELDLRIGAAFTRFQTLRLQRIFPEVLAEQLISYGSCQFPTLGFVVERFKAIQAFVPEIFHRIKVTHDHKDGIVEFNWKRHRLFNHTACLVLYQLCVEDPMATVVEVRSKPKSKWRPQALDTVELEKLASRKLRINAKETMRIAEKLYTQGYISYPRTETNIFPRDLNLTVLVEQQTPDPRWGAFAQSILERGGPTPRNGNKSDQAHPPIHPTKYTNNLQGDEQRLYEFIVRHFLACCSQDAQGQETTVEIDIAQERFVAHGLMILARNYLDVYPYDHWSDKILPVYEQGSHFQPSTVEMVDGETSPPKLLTEADLIALMEKHGIGTDATHAEHIETIKARMYVGLTPDKRFLPGHLGMGLVEGYDSMGYEMSKPDLRAELEADLKLICDGKKDKFVVLRQQVQKYKQVFIEAVAKAKKLDEALAQYFGNGTELAQQEDIYPAMPEPIRKCPQCNKDMVLKTKKNGGFYLSCMGFPECRSAVWLPDSVLEASRDSSVCPVCQPHPVYRLKLKFKRGSLPPTMPLEFVCCIGGCDDTLREILDLRFSGGPPRASQPSGRLQANQSLNRMDNSQHPQPADSRQTGSSKALAQTLPPPTAAGESNSVTCNCGQEAVLLTVRKEGPNRGRQFFKCNGGSCNFFLWADSPNPGAGGPPALAYRPLGASLGCPPGPGIHLGGFGNPGDGSGSGTSCLCSQPSVTRTVQKDGPNKGRQFHTCAKPREQQCGFFQWVDENTAPGTSGAPSWTGDRGRTLESEARSKRPRASSSDMGSTAKKPRKCSLCHQPGHTRPFCPQNR

TOP3A

DNA topoisomerase 3-alpha

928 amino acids

Releases the supercoiling and torsional tension of DNA introduced during the DNA replication and transcription by transiently cleaving and rejoining one strand of the DNA duplex. Introduces a single-strand break via transesterification at a target site in duplex DNA. The scissile phosphodiester is attacked by the catalytic tyrosine of the enzyme, resulting in the formation of a DNA-(5'-phosphotyrosyl)-enzyme intermediate and the expulsion of a 3'-OH DNA strand. The free DNA strand then undergoes passage around the unbroken strand thus removing DNA supercoils. Finally, in the religation step, the DNA 3'-OH attacks the covalent intermediate to expel the active-site tyrosine and restore the DNA phosphodiester backbone. Essential component of the RMI complex, a complex that plays an important role in the resolution step of homologous recombination, in a process called Holliday Junction dissolution, to limit DNA crossover formation in cells (By similarity).

Belongs to the type IA topoisomerase family.

103.754 kDa

MHHGGGGGAIRVLNVAEKPSVAKSVAEILSRPSGGMRSREGRSRYNRVFEFDYSIGGRACHMLVTSVTGHLMELEFDDRFRRWHSCDPADLFHAPVRKSVPQDKQDIKRTLEEEARKCQWLVLWLDCDREGENIAYEVIDICAGANSRLNIWRARFSALIDREIHEAVQHLDRPNKLFADAVDARQEIDLRIGASFTRFQTMLLKDAFVLDDTGDDRNIILSYGPCQFPTLGFIVERFWEIQAHEPEEFWTINCSHTSDEGTASFGWIRGHLFDYSSAVVIYEMCVEEPMATVQNVRNQEKLKYPPYPLSTIELQKRASRYFRMSSEHTMKVAEELYQAGFISYPRTETDNFSPNTDLHSIVHEQVAHPNWGTYAQRLLDPEARLWRNPSNGGHDDKAHPPIHPTKFSAGETNWTDNHKKLYELVVRHFLACCSQPAVGAETTVEIDIAGEQFNASGRVVLAKNYLDVYRFDSWGGTLLPTYIIGQQFVPTTLTLDSGMTRPPPLLAEADLLGCMDKAGIGTDATMHDHIKKLLDRCYATKDANTRFSPTNLGEALVMGYDEMGYELWKPYLRSMMEADMKSVSIGTKSKSEVLENCLQQMKACFLDARANKVKLFDAMGTFFARSSRPVNETQNSIETVRPCAACNESEMFLKQRPTGEFMVGCRGFPQCRNVVWLPRSLSGAAVTDQVCPTCAPGPVYKIQFKFRRRDIPPNFDVDHLGCIGGCDDILKELMELSRFGSHSQTATPARNQSQTASGVRQGSSRQDLHTSFHPAVQFTNGQTPVVNPQGFRSTHTQSSGNASGQVQCTSCREPCVLRTANTEANRGRKFYKCQNLACGFFAWEDDVENSAPRGRGGRGRGGRSSSRQSSASASAGRRGGTQGRGRRGRGRNADGMMFVAATGEPVYGSCFICGDPTHFANVCPNLGR

TOP3A

DNA topoisomerase 3-alpha

926 amino acids

Releases the supercoiling and torsional tension of DNA introduced during the DNA replication and transcription by transiently cleaving and rejoining one strand of the DNA duplex. Introduces a single-strand break via transesterification at a target site in duplex DNA. The scissile phosphodiester is attacked by the catalytic tyrosine of the enzyme, resulting in the formation of a DNA-(5'-phosphotyrosyl)-enzyme intermediate and the expulsion of a 3'-OH DNA strand. The free DNA strand then undergoes passage around the unbroken strand thus removing DNA supercoils. Finally, in the religation step, the DNA 3'-OH attacks the covalent intermediate to expel the active-site tyrosine and restore the DNA phosphodiester backbone. Essential component of the RMI complex, a complex that plays an important role in the resolution step of homologous recombination, in a process called Holliday Junction dissolution, to limit DNA crossover formation in cells. Together with RMI1, is essential for the resolution of meiotic recombination intermediates, a step that prevents entanglement of the parental chromosomes. May have DNA decatenation activity.

Belongs to the type IA topoisomerase family.

103.407 kDa

MSRRGGGPVTVLNVAEKPSVAKSVAGILSRGTFRTREGRSRYNKIFEFDYAINGQPCRMLMTSVIGHLMELEFADRYRKWHSCDPADLYQAPVMKHVPEDKKDIKKTLEEEARKSDWLVLWLDCDREGENIAFEVVDVCRAVKHNLFIRRAHFSALIDRDIHEAVQNLRDPNQLFAEAVDARQEIDLRIGASFTRFQTMLLRDRFAIDSTGEERSRVISYGPCQFPTLGFIVERYWEIQAHEPEEFWTINCSHQSEEGLATFNWMRGHLFDYASAVILYEMCVEEPTATVMNVPHPRERFKYPPYPLNTIELEKRASRYFRLSSEHTMKVAEELYQAGFISYPRTETDSFSSRTDLRAMVEEQTRHPAWGSYAQRLLEPEGGLWRNPANGGHDDKAHPPIHPTKFSSGESNWSRDHLNVYELVVRHYLACVSQPAVAAETTVEIDIAGERFSASGRAILAKNYLEVYRFESWGGSVIPVYEKGQQFIPTTLTLDAAVTRPPPLLCEADLLSCMDKAGIGTDATMHDHIKKLLDRGYATKDANTRFSPTNLGEALVMGYDDMGYELWKPNLRALMEHDMNEVSVGRKTKAEVLETCLQQMKACFLDARVKKSKLLEAMTIFFERSNNTDESESQTAGEVVRRCNLCNESDMALRKNRDGNFMVGCMNYPQCRNAVWLPGPTLEASVTTNVCQSCGPGPVYKILFKFRQIGIPPGFDVNHLGCVGGCDDILKQLIDICGTGSRSQARRTPGTAPSNNIQGSNTRQSNVCIHCQQRGHASTNCPSRVPASRNSRPTATNPRNDESTVSCNTCGSQCVLRTANTEANRGRQFFSCPTQGCSFFAWEDSINNSSGNATTGSNSGGSGRRGSRGRGRGGRGGQSSGGRRGSGTSFVSATGEPVSGIRCFSCGDPSHFANACPNRNNSNGNYF