IPTG(isopropyl) - D-thiogalactoside yog ib qho khoom siv hluavtaws uas siv dav hauv molecular biology thiab genetic engineering. IPTG muaj cov qauv zoo ib yam li lactose, tab sis txawv ntawm cov khoom siv tshuaj. IPTG muaj ntau yam tshuaj tiv thaiv, suav nrog cov tshuaj tiv thaiv hydrolysis, kev cuam tshuam nrog lactases, thiab kev cuam tshuam nrog lwm cov enzymes. Cov khoom siv reactive no ua rau IPTG yog ib qho cuab yeej tseem ceeb rau kev kawm txog noob caj noob ces txoj cai thiab kev qhia cov protein. Thaum siv IPTG rau kev sim, nws yog ib qho tsim nyog yuav tsum tau them sai sai rau nws txoj kev ruaj ntseg thiab kev cuam tshuam nrog lwm cov tebchaw kom ntseeg tau qhov tseeb thiab kev ntseeg siab ntawm qhov kev sim.
(Cov khoom txuas 1:https://www.bloomtechz.com/synthetic-chemical/api-researching-only/iptg-reagent-cas-367-93-1.html )
(Cov khoom txuas 1:https://www.bloomtechz.com/synthetic-chemical/api-researching-only/iptg-powder-cas-367-93-1.html)
1. Hydrolysis cov tshuaj tiv thaiv:
IPTG tuaj yeem ua rau cov tshuaj tiv thaiv hydrolysis nyob rau hauv qhov kub thiab txias lossis acidic. Hydrolysis tuaj yeem ua rau decomposition ntawm IPTG rau hauv thiogalactosides thiab isopropanol. Yog li ntawd, nws yog ib qho tsim nyog yuav tsum tsis txhob siv qhov kub thiab txias ntau dhau los yog acidic hauv kev sim kom tswj tau qhov kev ruaj ntseg thiab kev ua haujlwm ntawm IPTG. Hauv kev sim tshuaj lom neeg, IPTG feem ntau yog siv los txhawb cov noob qhia thiab cov protein crystallization. Nws mechanism ntawm kev txiav txim yog los ntawm kev khi rau lub lac|Cov khoom lag luam hauv lactose operon, hloov pauv nws qhov kev sib haum xeeb, yog li tawm hauv lacO thiab ua kom muaj kev hloov pauv ntxiv. Txoj cai tswjfwm kev hloov pauv tsis tu ncua no ua rau IPTG ua lub luag haujlwm tseem ceeb hauv kev tswj hwm noob caj noob ces.
2. Kev cuam tshuam nrog lactase:
Kev sib cuam tshuam ntawm IPTG thiab lactase yog ib qho ntawm nws cov tshuaj tiv thaiv tseem ceeb tshaj plaws. Lactase yog ib qho enzyme siv los decompose lactose rau hauv qabzib thiab galactose. Cov qauv ntawm IPTG zoo ib yam li lactose thiab tuaj yeem khi rau qhov chaw induction ntawm lactase, yog li ua kom muaj kev hloov pauv ntawm lactase. Qhov kev sib cuam tshuam no ua rau IPTG yog ib qho cuab yeej tseem ceeb rau kev kawm txog noob caj noob ces txoj cai thiab kev qhia cov protein.
Kev sib cuam tshuam ntawm IPTG thiab lactase yog lub ntsiab lus tseem ceeb hauv kev tshawb fawb txog biochemistry. Lactase yog ib qho enzyme uas tuaj yeem rhuav tshem lactose rau hauv galactose thiab qabzib, thaum IPTG yog ib qho inducer uas tuaj yeem ua rau kev qhia ntawm lactase.
Ua ntej, cia peb saib lactase. Lactase yog ib hom enzyme uas tsim los ntawm - Ib qho enzyme complex tsim ntawm galactosidase thiab acetyltransferase. Nws txoj haujlwm yog rhuav tshem lactose rau hauv galactose thiab qabzib, kom lub cev nqus tau thiab siv cov monosaccharides. Hauv cov tsiaj nyeg, qhov kev ua ntawm lactase feem ntau maj mam txo qis tom qab weaning, ua rau nws nyuaj rau cov neeg laus zom cov lactose. Txawm li cas los xij, hauv qee cov kab mob, kev ua haujlwm ntawm lactase yog siab, uas tso cai rau lawv loj hlob thiab tsim tawm hauv cov khoom noj siv mis.
Kev sib cuam tshuam ntawm IPTG thiab lactase feem ntau cuam tshuam nrog kev qhia ntawm lactase. Nyob rau hauv lub lactose operon, lac|yog ib tug tswj gene uas encodes ib repressor protein. Lub luag haujlwm ntawm lac|Cov khoom yog tswj hwm - Kev qhia ntawm galactosidase. Nyob rau hauv tsis muaj lactose, lub conformation ntawm lac|cov khoom hloov pauv, tso tawm los ntawm qhov chaw sib txuas ntawm tus neeg txhawb nqa, tso cai rau RNA polymerase khi rau tus txhawb nqa thiab sau ntawv - Cov noob rau galactosidase. Txawm li cas los xij, thaum IPTG khi rau lac|cov khoom, nws induces conformational hloov, ua rau lac|cov khoom kom tawm ntawm qhov chaw khi ntawm tus neeg txhawb nqa, yog li ua kom cov ntaub ntawv hloov pauv. Txoj cai tswjfwm kev hloov pauv tsis tu ncua no ua rau IPTG ua lub luag haujlwm tseem ceeb hauv kev tswj hwm noob caj noob ces.
Ntxiv nrog rau inducing qhov kev qhia ntawm lactase, IPTG tuaj yeem txhawb nqa cov protein crystallization. Hauv kev sim protein crystallization, IPTG, raws li cov amino acid derivative uas tsis yog ntuj tsim, tuaj yeem khi rau qee cov proteins thiab induce lawv crystallization. Qhov kev muaj peev xwm los ntxias crystallization ua rau IPTG yog ib qho tseem ceeb ntawm kev sim tshuaj lom neeg.
3. Kev sib cuam tshuam nrog lwm cov enzymes:
Ntxiv nrog rau lactase, IPTG kuj tseem cuam tshuam nrog lwm cov enzymes. Piv txwv li, IPTG tuaj yeem yog - Galactosidase hydrolyzes los tsim thiogalactoside thiab isopropanol. Qhov kev cuam tshuam no tuaj yeem cuam tshuam rau qhov kev sim, yog li nws yuav tsum xav txog qhov muaj peev xwm tshwm sim ntawm IPTG thiab lwm yam enzymes thaum tsim qhov kev sim.
4. Kev cuam tshuam nrog intracellular metabolism:
Lub metabolic tus nqi ntawm IPTG nyob rau hauv cov hlwb kuj qeeb, yog li nws cuam tshuam rau kev loj hlob ntawm tes thiab cov metabolism hauv me me. Txawm li cas los xij, qee qhov xwm txheej, cov txheej txheem metabolic hauv lub cev tuaj yeem cuam tshuam rau IPTG. Piv txwv li, kev sib tw substrate hauv cov hlwb tuaj yeem cuam tshuam kev cuam tshuam ntawm IPTG thiab lactase. Yog li ntawd, nws yog ib qho tsim nyog yuav tsum tau them sai sai rau qhov muaj peev xwm cuam tshuam ntawm intracellular metabolism hauv IPTG hauv kev sim.
Intracellular metabolism yog hais txog tag nrho cov tshuaj tiv thaiv nyob rau hauv lub cell, nrog rau cov piam thaj metabolism, rog metabolism, protein metabolism, thiab lwm yam. Cov txheej txheem metabolic no tseem ceeb heev rau kev ciaj sia thiab kev ua haujlwm ntawm cov hlwb. Raws li ib qho exogenous compound, IPTG tuaj yeem cuam tshuam nrog qee yam hauv cov hlwb, yog li cuam tshuam rau cov metabolism hauv intracellular.
Ua ntej, IPTG tuaj yeem cuam tshuam cov metabolism hauv qabzib. Qab Zib metabolism yog ib qho tseem ceeb tshaj plaws hauv cov txheej txheem metabolic hauv cov hlwb, uas suav nrog kev sib cais thiab kev sib txuas ntawm cov suab thaj. Qee zaum, IPTG tuaj yeem ua rau - Cov haujlwm ntawm galactosidase, uas tuaj yeem decompose lactose rau hauv galactose thiab qabzib. Cov nyhuv no tuaj yeem txhawb kev tawg thiab metabolism ntawm cov suab thaj, yog li muab lub zog. Tsis tas li ntawd, IPTG tseem tuaj yeem cuam tshuam cov synthesis thiab metabolism ntawm cov suab thaj. Hauv kev sim protein crystallization, IPTG tuaj yeem siv los ua cov amino acid uas tsis yog ntuj tsim los koom nrog cov txheej txheem protein synthesis.
Qhov thib ob, IPTG tuaj yeem cuam tshuam cov roj metabolism. Rog yog ib qho tseem ceeb ntawm lub zog ntawm cov hlwb, thiab nws cov decomposition thiab synthesis tseem ceeb heev rau kev ciaj sia thiab kev ua haujlwm ntawm cov hlwb. Qee zaum, IPTG tuaj yeem ua rau muaj kev ua haujlwm ntawm lipolytic enzymes, yog li txhawb cov rog catabolism. Tsis tas li ntawd, IPTG tseem tuaj yeem cuam tshuam rau kev sib txuas thiab cov metabolism ntawm fatty acids, yog li cuam tshuam rau kev loj hlob ntawm tes thiab kev sib txawv.
Thaum kawg, IPTG tuaj yeem cuam tshuam cov metabolism hauv cov protein. Hauv kev sim protein crystallization, IPTG tuaj yeem siv los ua cov amino acid uas tsis yog ntuj tsim los koom nrog cov txheej txheem protein synthesis. Tsis tas li ntawd, IPTG tseem tuaj yeem cuam tshuam cov protein catabolism, yog li tswj kev loj hlob ntawm tes thiab kev sib txawv.
5. Lwm yam tshuaj tiv thaiv:
Ntxiv nrog rau cov tshuaj tiv thaiv saum toj no, IPTG tuaj yeem koom nrog qee yam tshuaj lom neeg. Piv txwv li, IPTG tuaj yeem nkag mus rau ester pauv kev cuam tshuam nrog lwm cov tebchaw los tsim cov tebchaw tshiab. Cov tshuaj tiv thaiv no tuaj yeem siv rau hauv cov qauv kev sim tshwj xeeb.