{"id":4380,"date":"2026-10-12T08:33:03","date_gmt":"2026-10-12T08:33:03","guid":{"rendered":"https:\/\/nhdbio.com\/?p=4380"},"modified":"2026-10-12T08:33:03","modified_gmt":"2026-10-12T08:33:03","slug":"ll37-peptidos-derivados-tuberculosis-ic50","status":"publish","type":"post","link":"https:\/\/nhdbio.com\/es\/ll37-derived-peptides-tuberculosis-ic50\/","title":{"rendered":"P\u00e9ptidos LL-37 modificados: c\u00f3mo los cambios estructurales afectaron a las bacterias de la tuberculosis"},"content":{"rendered":"
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\"LL-37
Editorial illustration, not an experimental photograph.<\/figcaption><\/figure>\n

Also from LL-37 fragments, changing the end or one amino acid may give different results. A 2026 study compared two modified peptides, measuring both inhibitory concentration and checking whether the bacterial outer layer was affected.<\/p>\n

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What was tested was a modified fragment, not the complete LL-37<\/h2>\n

The study compared LL37-1 with D-LL37. The former is a truncated peptide with terminal amidation, while the latter also involves terminal acetylation and one D-type amino acid substitution.<\/p>\n

D-type and common L-type amino acids can be simply understood as different spatial forms. Changing only one position may also affect peptide stability and interactions. Therefore, experimental materials need to be confirmed by specific structure.<\/p>\n<\/section>\n

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What does IC50 mean?<\/h2>\n

IC50 is the concentration required to achieve 50% inhibition. Under the same experimental conditions, a lower value means a lower material concentration is needed to reach this inhibition level.[1]<\/a><\/p>\n

The IC50 of D-LL37 is about 10.11 micromolar, and that of LL37-1 is about 15.45 micromolar. The IC90 values are about 18.40 and 25.44 micromolar respectively. What is compared here is the inhibitory concentration under culture conditions, not a human therapeutic dose.<\/p>\n