Ufa wa L-Tyrosine
l-tyrosine
chiyambi chachidule
Tyrosine (yofupikitsidwa ngati Tyr kapena Y) kapena 4-hydroxyphenylalanine ndi imodzi mwa ma amino acid 22 omwe amagwiritsidwa ntchito ndi maselo popanga mapuloteni. Ingagwiritsidwe ntchito popanga mapuloteni m'maselo, ndi ma codons UAC ndi UAU. Ndi amino acid yosafunikira yomwe ili ndi magulu am'mbali mwa polar ndipo imatha kupangidwa ndi thupi la munthu. Mawu oti 'tyrosine' amachokera ku tyros yachi Greek, kutanthauza tchizi. Kumayambiriro kwa zaka za m'ma 1800, idapezeka koyamba ndi katswiri wa zamankhwala waku Germany Eustus von Libich mu tchizi cha casein, ndipo ikagwiritsidwa ntchito ngati gulu logwira ntchito kapena la mbali, imatchedwa tyrosine.
ntchito
Kuwonjezera pa kukhala amino acid ya puloteni, tyrosine imagwira ntchito yapadera popereka zizindikiro m'mapuloteni podalira magulu ogwira ntchito a phenolic. Ntchito yake ndi ngati cholandirira magulu a phosphate omwe amasamutsidwa ndi mapuloteni kinases (omwe amatchedwa tyrosine kinase receptors), pomwe phosphorylation ya magulu a hydroxyl imasintha ntchito ya puloteni yomwe ikufunidwa.
Tyrosine imagwiranso ntchito yofunika kwambiri mu photosynthesis, imagwira ntchito ngati wopereka ma elekitironi mu kuchepetsa kwa chlorophyll yosungunuka mu ma chloroplasts (Photosystem II), kuchotsa protonation ya magulu a phenolic OH, ndipo potsiriza kuchepetsa ndi magulu anayi a manganese mu Photosystem II.
Zakudya zomwe zimapezeka
Tyrosine imatha kupangidwa kuchokera ku phenylalanine m'thupi ndipo imapezeka muzakudya zambiri zokhala ndi mapuloteni ambiri monga nkhuku, Turkey, nsomba, mkaka, yogati, tchizi, tchizi, mtedza, amondi, mbewu za dzungu, sesame, soya, nyemba za lima, ma avocado, ndi nthochi.
L-tyrosine ndi amino acid yosafunikira komanso imodzi mwa zinthu zofunika kwambiri pa kagayidwe ka methionine. Imapezeka kwambiri m'zamoyo ndipo imagwira ntchito yofunika kwambiri m'njira zosiyanasiyana zamoyo.
L-tyrosine ndi gawo la mapuloteni ndipo imagwira ntchito popanga mapuloteni. Ndiwonso woyambitsa zinthu zosiyanasiyana zomwe zimagwira ntchito m'thupi, kuphatikizapo ma neurotransmitters a catecholamine monga dopamine, norepinephrine, ndi adrenaline, komanso mahomoni a chithokomiro ndi melanin.
Kuphatikiza apo, L-tyrosine imagwiranso ntchito popanga mamolekyu ofunikira a zamoyo kudzera mu ma enzyme angapo m'thupi, monga tyrosine kinase ndi tyrosine hydroxylase, zomwe zimagwiritsidwa ntchito mu njira zolumikizirana za kinase ndikuwongolera thupi.
Kudya L-tyrosine kungapezeke kudzera mu zakudya, zomwe zimakhala ndi zakudya zambiri kuphatikizapo mtedza, mbewu, nyama, nsomba, ndi mkaka. Kuphatikiza apo, L-tyrosine imathanso kusinthidwa kuchokera ku amino acid ina, phenylalanine, kudzera mu njira yopangira tyrosine m'thupi.
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