>gnl|CDD|176475 cd08638, DNA_pol_A_theta, DNA polymerase theta is a low-fidelity family A enzyme implicated in translesion synthesis and in somatic hypermutation. DNA polymerase theta is a low-fidelity family A enzyme implicated in translesion synthesis (TLS) and in somatic hypermutation (SHM). DNA-dependent DNA polymerases can be classified in six main groups based upon phylogenetic relationships with E. coli polymerase I (classA), E. coli polymerase II (class B), E.coli polymerase III (class C), euryarchaaeota polymerase II (class D), human polymerase beta (class x), E. coli UmuC/DinB and eukaryotic RAP 30/Xeroderma pigmentosum variant (class Y). Family A polymerase functions primarily to fill DNA gaps that arise during DNA repair, recombination and replication. Pol theta is an exception among family A polymerases and generates processive single base substitutions. Family A polymerase are found primarily in organisms related to prokaryotes and include prokaryotic DNA polymerase I (pol I) ,mitochondrial polymerase delta, and several bacteriphage polymerases including those from odd-numbered phage (T3, T5, and T7). Prokaryotic Pol Is have two functional domains located on the same polypeptide; a 5'-3' polymerase and 5'-3' exonuclease. Pol I uses its 5' nuclease activity to remove the ribonucleotide portion of newly synthesized Okazaki fragments and DNA polymerase activity to fill in the resulting gap. Polymerase theta mostly has amino-terminal helicase domain, a carboxy-terminal polymerase domain and an intervening space region. Length = 373

 Score = 58.4 bits (142), Expect = 7e-09
 Identities = 46/196 (23%), Positives = 89/196 (45%), Gaps = 20/196 (10%)

Query: 279 LNRLASSGSAILKLNTLSEAVSSDGRLRGTLQFYGASRTGRWSGCVFQP--QNLPRQERS 336
           L++L ++    L L     +     R+  T    G + TGR S    +P  QN+P+    
Sbjct: 55  LSKLLTTYVEPLLLLCKLSSSLQMYRIHPTWNQTGTA-TGRLS-SS-EPNLQNVPKDFEI 111

Query: 337 EEILTQTIQALNRGETIADPLGLASDCVRSCIIASNGKKLVVADLAGIEARVLAWIAGED 396
           ++  +    +     TI+         +R   I   G+ L+ AD + +E R+LA ++G+ 
Sbjct: 112 KDAPSPPAGSEGDIPTIS---------LRHAFIPPPGRVLLSADYSQLELRILAHLSGDP 162

Query: 397 WKIKAFANGEDIYVTTYAKAFNTPIDKVSKEQRAIGKVMELALGYQGGAKVFKTMASHCG 456
             I+   +G D++    A+    P+++V+ E+R   K +   + Y  GA   K++A   G
Sbjct: 163 ALIELLNSGGDVFKMIAAQWLGKPVEEVTDEERQQAKQLVYGILYGMGA---KSLAEQLG 219

Query: 457 LDL---QQFSQNVKST 469
           +     +QF ++ K+ 
Sbjct: 220 VSEEEAKQFIESFKNA 235