16-05-2013 дата публикации
Номер: US20130122567A1
The present invention provides the field of enhancing proteins and in particular to that of proteins enhanced by molecular change. It provides a variant of a phytase that is termed enhanced in that is has better thermostability and/or activity than the original phytase. The invention also provides a nucleic acid coding for said variant, a cassette or an expression vector containing said variant, a host cell expressing said variant, a composition comprising said variant and uses thereof, principally in the preparation of food additives and animal feed. 1. An enhanced phytase variant whose sequence is SEQ ID NO: 1 or a functional derivative thereof , comprising at least one substitution on one of the amino acids from the group consisting of P3 , V4 , A5 , P8 , T9 , G10 , V16 , V17 , L19 , S20 , R21 , H22 , G23 , V24 , R25 , S26 , P27 , T28 , K29 , Q30 , T31 , Q32 , L33 , M34 , D36 , P39 , K41 , W45 , A49 , G50 , Y51 , L52 , T53 , G56 , A57 , V60 , Y67 , G75 , A78 , C81 , D92 , V93 , D94 , Q95 , R96 , T97 , R98 , L99 , T100 , G101 , A103 , V116 , V125 , D126 , F129 , H130 , P131 , V132 , D133 , D140 , T142 , Q143+H145 , A147 , L152 , P155 , L156 , E158 , E158+S160 , F167 , A177 , C182 , G189 , D193 , N196 , F197 , K201 , K206 , P207 , T209 , K210 , V211 , S212 , L213 , L217 , A218 , L219 , S220 , S221 , T222 , L223 , G224 , E225 , I226 , F227 , L228 , L229 , Q230 , N231 , Q233 , A234 , P236 , R242 , I250 , S251 , L252 , L253 , L255 , H256 , N257 , Q259 , F260 , D261 , M263 , A264 , Y268 , K273 , G274 , P276 , L277 , Q292 , G293 , P297 , P300 , Q301 , G308 , G309 , H310 , D311 , T312 , N313 , I314 , A315 , N316 , G322 , A323 , Q326 , P331 , D332 , N333 , T334 , P335 , P336 , G337 , G338 , G339 , V341 , E343 , D349 , Q352 , R353 , Y354 , I355 , A370 , E371 , K376 , P379 , A380 , G381 , D388 , E391 , S393 , G394 and P414 , the positions being indicated in SEQ ID NO: 1.2. The enhanced phytase variant whose sequence is SEQ ID NO: 1 or a functional derivative thereof ...
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