Mechanisms by Which Human DNA Primase Chooses To Polymerize a Nucleoside Triphosphate was written by Urban, Milan;Joubert, Nicolas;Purse, Byron W.;Hocek, Michal;Kuchta, Robert D.. And the article was included in Biochemistry in 2010.Formula: C8H8N2 This article mentions the following:
Human DNA primase synthesizes short RNA primers that DNA polymerase α then elongates during the initiation of all new DNA strands. Even though primase misincorporates NTPs at a relatively high frequency, this likely does not impact the final DNA product since the RNA primer is replaced with DNA. We used an extensive series of purine and pyrimidine analogs to provide further insights into the mechanism by which primase chooses whether or not to polymerize a NTP. Primase readily polymerized a size-expanded cytosine analog, 1,3-diaza-2-oxophenothiazine NTP, across from a templating G but not across from A. The enzyme did not efficiently polymerize NTPs incapable of forming two Watson-Crick hydrogen bonds with the templating base with the exception of UTP opposite purine deoxyribonucleoside. Likewise, primase did not generate base pairs between two nucleotides with altered Watson-Crick hydrogen-bonding patterns. Examining the mechanism of NTP polymerization revealed that human primase can misincorporate NTPs via both template misreading and a primer-template slippage mechanism. Together, these data demonstrate that human primase strongly depends on Watson-Crick hydrogen bonds for efficient nucleotide polymerization, much more so than the mechanistically related herpes primase, and provide insights into the potential roles of primer-template stability and base tautomerization during misincorporation. In the experiment, the researchers used many compounds, for example, 7-Methyl-1H-benzo[d]imidazole (cas: 4887-83-6Formula: C8H8N2).
7-Methyl-1H-benzo[d]imidazole (cas: 4887-83-6) belongs to imidazole derivatives. 1H-imidazole is an imidazole tautomer which has the migrating hydrogen at position 1. It is a conjugate base of an imidazolium cation. It is a conjugate acid of an imidazolide. It is a tautomer of a 4H-imidazole. This ring system is present in important biological building blocks, such as histidine and the related hormone histamine.Formula: C8H8N2
Referemce:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem