Streptolydigin_product_DataBase

Bioactivity	Streptolydigin (Portamycin) is a 3-acetyltetramic acid antibiotic and a potent bacterial RNA polymerase inhibitor with a Ki of 18 μM and a Kd of 15 μM. Streptolydigin inhibits RNA synthesis by binding to RNA polymerase and does not inhibit eukaryotic RNA polymerases[1][2][3]. Streptolydigin possess potent antibacterial activity, particularly against anaerobes and some Gram-positive aerobes[4].
Invitro	The antibiotic Streptolydigin (Stl) is a derivative of 3-acetyltetramic acid. Binding of Streptolydigin to RNA polymerase strictly depends on a noncatalytic magnesium ion which is likely chelated by the aspartate of the bridge helix of the active center[1]. Streptolydigin inhibits T. thermophilus RNA polymerase with a Ki of 1.8 μM[3]. Streptolydigin (Stl) inhibits initiation, elongation, and pyrophosphorolysis by bacterial RNA polymerase. Streptolydigin interacts with three structural elements within RNAP: the Stl pocket, the bridge helix, and the trigger-loop region. The Streptolydigin streptolol moiety interacts with the Streptolydigin pocket and bridge helix, and the Streptolydigin tetramic-acid moiety interacts with the trigger-loop region[3].
Name	Streptolydigin
CAS	7229-50-7
Formula	C32H44N2O9
Molar Mass	600.70
Transport	Room temperature in continental US; may vary elsewhere.
Storage	Please store the product under the recommended conditions in the Certificate of Analysis.

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