>cd01491 Ube1_repeat1 Ubiquitin activating enzyme (E1), repeat 1. E1, a highly conserved small protein present universally in eukaryotic cells, is part of cascade to attach ubiquitin (Ub) covalently to substrate proteins. This cascade consists of activating (E1), conjugating (E2), and/or ligating (E3) enzymes and then targets them for degradation by the 26S proteasome. E1 activates ubiquitin by C-terminal adenylation, and subsequently forms a highly reactive thioester bond between its catalytic cysteine and ubiquitin's C-terminus. E1 also associates with E2 and promotes ubiquitin transfer to the E2's catalytic cysteine. Ubiquitin-E1 is a single-chain protein with a weakly conserved two-fold repeat. This CD represents the first repeat of Ub-E1.

Probab=96.03  E-value=0.087  Score=31.69  Aligned_cols=37  Identities=22%  Similarity=0.346  Sum_probs=33.0

Q ss_pred             CCCCEEEEECCCCHHHHHHHHHHHCCCCEEEEEECCC
Q ss_conf             9987289988981368999999957998699996578
Q gi|254781048|r    1 MKSNKIALIGSGMIGGTLAHLAVLKKLGDVVLLDIVD   37 (320)
Q Consensus         1 mk~~KV~IIGaG~VG~~~a~~~~~~~l~ei~L~D~~~   37 (320)
T Consensus        17 l~~s~Vli~G~~glg~Ei~Knlvl~Gv~~i~i~D~~~   53 (286)
T cd01491          17 LQKSNVLISGLGGLGVEIAKNLILAGVKSVTLHDTKP   53 (286)
T ss_pred             HHHCCEEEECCCHHHHHHHHHHHHCCCCEEEEEECCC
T ss_conf             9759299999876399999999973996599995996