{"id":1829,"date":"2026-09-06T06:00:00","date_gmt":"2026-09-05T21:00:00","guid":{"rendered":"https:\/\/onepress.co.kr\/?post_type=briefing&p=1829"},"modified":"2026-09-06T06:14:32","modified_gmt":"2026-09-05T21:14:32","slug":"2026-09-06-eight-letter-genetic-alphabet-en","status":"publish","type":"briefing","link":"https:\/\/onepress.co.kr\/index.php\/briefing\/2026-09-06-eight-letter-genetic-alphabet-en\/","title":{"rendered":"A bacterial enzyme read an eight-letter genetic alphabet"},"content":{"rendered":"

2026-09-06 05:58 KST<\/strong><\/p>\n

E. coli RNA polymerase can read and transcribe an eight-letter genetic alphabet made from DNA\u2019s four natural bases plus four synthetic ones. A September 2 Nature Communications paper shows how two unnatural pairs, P:Z and B:S, fit the enzyme in native-like geometries.<\/p>\n

The study did not create a new organism or prove a therapy in human cells. It used purified bacterial enzyme and short nucleic acids in vitro; stable replication, transcription and translation inside cells remain separate challenges.<\/p>\n

What are the eight letters?<\/h2>\n

The system adds synthetic P, Z, B and S to A, T, C and G. More letters greatly expand possible sequences and chemical functions, but the added bases are not a natural organism\u2019s alphabet.<\/p>\n

How was reading tested?<\/h2>\n

Researchers measured incorporation by E. coli RNA polymerase and solved four cryo-EM structures at 2.42\u20132.75 angstrom resolution. The pairs occupied the active site much like natural bases.<\/p>\n

\"A
This AI-generated image explains the topic; it is not a photograph of the actual event, observation, or experiment.<\/figcaption><\/figure>\n

Were there errors?<\/h2>\n

Z could mispair with natural G. A modified Z* analogue reduced that error, showing an engineering fix rather than a perfect completed system.<\/p>\n

Why does it matter?<\/h2>\n

Expanded alphabets could support new binding molecules, diagnostics or biomaterials. Cellular stability, toxicity, replication accuracy and biosafety still need testing.<\/p>\n

What comes next?<\/h2>\n

Researchers must test long-term maintenance in cells and links to replication and protein translation. The result establishes one central transcription step, not a complete synthetic life form.<\/p>\n

Primary sources and independent checks<\/h2>\n

Nature Communications \uc6d0 \ub17c\ubb38<\/a><\/p>\n

UC San Diego \uc5f0\uad6c \ubc1c\ud45c<\/a><\/p>\n

PNAS \uc5f0\uad00 \uc6d0 \ub17c\ubb38<\/a><\/p>\n

Phys.org \ub3c5\ub9bd \ud655\uc778<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

E. coli RNA polymerase transcribed DNA containing four synthetic bases in vitro. The work did not create a new organism or treatment.<\/p>\n","protected":false},"featured_media":0,"template":"","meta":[],"class_list":["post-1829","briefing","type-briefing","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/onepress.co.kr\/index.php\/wp-json\/wp\/v2\/briefing\/1829","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/onepress.co.kr\/index.php\/wp-json\/wp\/v2\/briefing"}],"about":[{"href":"https:\/\/onepress.co.kr\/index.php\/wp-json\/wp\/v2\/types\/briefing"}],"wp:attachment":[{"href":"https:\/\/onepress.co.kr\/index.php\/wp-json\/wp\/v2\/media?parent=1829"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}