Leusin: Béda antarrépisi

'''Leusin''' (lambang '''Leu''' atawa '''L''')<ref>{{cite web | url = http://www.chem.qmul.ac.uk/iupac/AminoAcid/AA1n2.html | title = Nomenclature and Symbolism for Amino Acids and Peptides | publisher = IUPAC-IUB Joint Commission on Biochemical Nomenclature | year = 1983 | access-date = 5 March 2018 | archive-url = https://web.archive.org/web/20081009023202/http://www.chem.qmul.ac.uk/iupac/AminoAcid/AA1n2.html | archive-date = 9 October 2008 | url-status = dead }} {{Webarchive|url=https://web.archive.org/web/20081009023202/http://www.chem.qmul.ac.uk/iupac/AminoAcid/AA1n2.html |date=9 October 2008 }}</ref> nyaéta [[asam amino ésénsial]] anu dipaké dina [[biosintésis]] [[protéin]]. Leusin téh asam α-amino, nu hartina ngandung gugus α-[[gugus amino|amino]] (anu dina wangun protonasi −NH₃⁺ dina kaayaan biologis), gugus α-[[asam karboksilat]] (anu dina wangun deprotonasi −COO⁻ dina kaayaan biologis), jeung hiji ranté gigir [[isobutil|gugus isobutil]], anu ngajadikeun ieu asam amino [[sanyawa alipatik|alipatik]] [[polaritas kimia|non-polar]]. [[Kode genetik]]na [[kodon]] UUA, UUG, CUU, CUC, CUA, jeung CUG.