Dab tsi yog qhov txwv enzymes siv rau hauv qhov xwm txheej?

2024 Tus sau: Stanley Ellington | [email protected]. Kawg hloov kho: 2023-12-16 00:17

Kev txwv enzyme, tseem hu ua txwv endonuclease, ib qho protein ua los ntawm kab mob taj qob DNA ntawm qhov chaw tshwj xeeb raws cov molecule. Hauv cov kab mob ntawm tes , txwv enzymes cleave txawv teb chaws DNA , yog li tshem tawm cov kab mob.

Yog li ntawd, dab tsi yog lub luag haujlwm ntawm kev txwv enzymes hauv cov xwm txheej?

A txwv enzyme yog cov protein uas paub txog qhov tshwj xeeb, luv luv nucleotide ib ntus thiab txiav DNA tsuas yog ntawm qhov chaw tshwj xeeb, uas yog hu ua txwv qhov chaw lossis lub hom phiaj ua ntu zus. Hauv cov kab mob muaj sia, txwv kev ua haujlwm ntawm cov enzymes los tiv thaiv lub cell tiv thaiv kev kis tus kab mob bacteriophages.

Ib yam li ntawd, kev txwv enzymes npe li cas? Kev txwv enzymes muaj npe raws li cov kab mob uas lawv tau tshawb pom. Piv txwv li, lub enzyme Hind III raug cais tawm ntawm Haemophilus influenzae, lim Rd. Thawj peb tsab ntawv ntawm lub npe yog italicized vim lawv abbreviate lub genus thiab hom npe ntawm lub cev.

Ib yam li ntawd ib tug yuav nug, qhov twg yog qhov txwv enzymes pom nyob rau hauv qhov?

Txhawm rau txiav DNA, tag nrho txwv enzymes ua ob qhov kev txiav, ib zaug los ntawm txhua lub qab zib-phosphate qaum (piv txwv li txhua txoj hlua) ntawm DNA ob lub helix. Cov no cov enzymes yog pom nyob rau hauv cov kab mob thiab archaea thiab muab ib tug tiv thaiv mechanism tiv thaiv invading kab mob.

Lub evolutionary keeb kwm ntawm kev txwv enzymes yog dab tsi thiab lawv lub hom phiaj yog dab tsi?

Kev txwv endonucleases (REases) tiv thaiv cov kab mob los ntawm invading txawv teb chaws DNAs thiab yog endowed nrog exquisite sequence specifications. REases muaj keeb kwm los ntawm cov poj koob yawm txwv cov proteins thiab evolved tshiab sequence specifications los ntawm genetic recombination, gene duplication, replication slippage, thiab transpositional xwm txheej.