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    "title": "Why your AP-site DNA templates slip when you least expect it",
    "entity": "Why your AP-site DNA templates slip when you least expect it",
    "url": "https://www.preppinpeppers.com/blogs/the-lab/why-ap-site-dna-templates-slip-when-least-expect",
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    "tldr": "HMCES cross-links to AP sites in single-stranded DNA, and that cross-link drives the biology. Even trimmed by SPRTN to a five-amino-acid peptide, it still acts.",
    "facts": [
        {
            "id": "why-ap-site-dna-templates-slip-when-least-expect:title",
            "category": "identity",
            "entity": "Why your AP-site DNA templates slip when you least expect it",
            "attribute": "title",
            "value": "Why your AP-site DNA templates slip when you least expect it",
            "source": "Lab article (https://www.preppinpeppers.com/blogs/the-lab/why-ap-site-dna-templates-slip-when-least-expect)",
            "evidence": "https://www.preppinpeppers.com/blogs/the-lab/why-ap-site-dna-templates-slip-when-least-expect"
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            "category": "identity",
            "entity": "Why your AP-site DNA templates slip when you least expect it",
            "attribute": "published",
            "value": "2026-08-17",
            "source": "Lab article (https://www.preppinpeppers.com/blogs/the-lab/why-ap-site-dna-templates-slip-when-least-expect)",
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        {
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            "category": "identity",
            "entity": "Why your AP-site DNA templates slip when you least expect it",
            "attribute": "author",
            "value": "PreppinPeppers Editorial Team",
            "source": "Lab article (https://www.preppinpeppers.com/blogs/the-lab/why-ap-site-dna-templates-slip-when-least-expect)",
            "evidence": "https://www.preppinpeppers.com/blogs/the-lab/why-ap-site-dna-templates-slip-when-least-expect"
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        {
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            "category": "identity",
            "entity": "Why your AP-site DNA templates slip when you least expect it",
            "attribute": "topics",
            "value": "peptide research, Research, study",
            "source": "Lab article (https://www.preppinpeppers.com/blogs/the-lab/why-ap-site-dna-templates-slip-when-least-expect)",
            "evidence": "https://www.preppinpeppers.com/blogs/the-lab/why-ap-site-dna-templates-slip-when-least-expect"
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        {
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            "category": "content",
            "entity": "Why your AP-site DNA templates slip when you least expect it",
            "attribute": "summary",
            "value": "HMCES cross-links to AP sites in single-stranded DNA, and that cross-link drives the biology. Even trimmed by SPRTN to a five-amino-acid peptide, it still acts.",
            "source": "Lab article (https://www.preppinpeppers.com/blogs/the-lab/why-ap-site-dna-templates-slip-when-least-expect)",
            "evidence": "https://www.preppinpeppers.com/blogs/the-lab/why-ap-site-dna-templates-slip-when-least-expect"
        },
        {
            "id": "why-ap-site-dna-templates-slip-when-least-expect:section-1",
            "category": "content",
            "entity": "Why your AP-site DNA templates slip when you least expect it",
            "attribute": "section",
            "value": "What HMCES Does",
            "source": "Lab article (https://www.preppinpeppers.com/blogs/the-lab/why-ap-site-dna-templates-slip-when-least-expect)",
            "evidence": "https://www.preppinpeppers.com/blogs/the-lab/why-ap-site-dna-templates-slip-when-least-expect"
        },
        {
            "id": "why-ap-site-dna-templates-slip-when-least-expect:section-2",
            "category": "content",
            "entity": "Why your AP-site DNA templates slip when you least expect it",
            "attribute": "section",
            "value": "What HMCES actually does to an AP site",
            "source": "Lab article (https://www.preppinpeppers.com/blogs/the-lab/why-ap-site-dna-templates-slip-when-least-expect)",
            "evidence": "https://www.preppinpeppers.com/blogs/the-lab/why-ap-site-dna-templates-slip-when-least-expect"
        },
        {
            "id": "why-ap-site-dna-templates-slip-when-least-expect:section-3",
            "category": "content",
            "entity": "Why your AP-site DNA templates slip when you least expect it",
            "attribute": "section",
            "value": "The surprising result: it's the cross-link, not the peptide length",
            "source": "Lab article (https://www.preppinpeppers.com/blogs/the-lab/why-ap-site-dna-templates-slip-when-least-expect)",
            "evidence": "https://www.preppinpeppers.com/blogs/the-lab/why-ap-site-dna-templates-slip-when-least-expect"
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            "category": "content",
            "entity": "Why your AP-site DNA templates slip when you least expect it",
            "attribute": "section",
            "value": "Why this matters at the bench",
            "source": "Lab article (https://www.preppinpeppers.com/blogs/the-lab/why-ap-site-dna-templates-slip-when-least-expect)",
            "evidence": "https://www.preppinpeppers.com/blogs/the-lab/why-ap-site-dna-templates-slip-when-least-expect"
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            "category": "content",
            "entity": "Why your AP-site DNA templates slip when you least expect it",
            "attribute": "section",
            "value": "The bigger picture",
            "source": "Lab article (https://www.preppinpeppers.com/blogs/the-lab/why-ap-site-dna-templates-slip-when-least-expect)",
            "evidence": "https://www.preppinpeppers.com/blogs/the-lab/why-ap-site-dna-templates-slip-when-least-expect"
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            "category": "source",
            "entity": "Why your AP-site DNA templates slip when you least expect it",
            "attribute": "cites",
            "value": "this coverage at bioRxiv → - www.biorxiv.org",
            "source": "Lab article (https://www.preppinpeppers.com/blogs/the-lab/why-ap-site-dna-templates-slip-when-least-expect)",
            "evidence": "https://www.biorxiv.org/content/10.64898/2026.08.14.744967v1?rss=1"
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            "category": "source",
            "entity": "Why your AP-site DNA templates slip when you least expect it",
            "attribute": "cites",
            "value": "Yudkina et al., Int J Mol Sci 2023: Bypass of Abasic Site-Peptide Cross-Links by Human Repair and Translesion DNA Polymerases - pmc.ncbi.nlm.nih.gov",
            "source": "Lab article (https://www.preppinpeppers.com/blogs/the-lab/why-ap-site-dna-templates-slip-when-least-expect)",
            "evidence": "https://pmc.ncbi.nlm.nih.gov/articles/PMC10341727/"
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            "value": "Gansulin Pen · Reusable Click-Dial, 3 ml (1-60 Units)",
            "source": "Lab article (https://www.preppinpeppers.com/blogs/the-lab/why-ap-site-dna-templates-slip-when-least-expect)",
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            "value": "Gansulin-Compatible 3 ml Glass Cartridge for Pens (10-Pack)",
            "source": "Lab article (https://www.preppinpeppers.com/blogs/the-lab/why-ap-site-dna-templates-slip-when-least-expect)",
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    "faq": [
        {
            "q": "Does trimming HMCES off the AP site make bypass cleaner?",
            "a": "No. In Xenopus egg extracts, mutagenicity of HMCES-DPC bypass is insensitive to how much SPRTN has proteolyzed the cross-link; only cross-link formation itself matters, because it locks the AP site in a dynamic ring-opened state."
        },
        {
            "q": "Why does the base 5' of the AP site change the mutation spectrum?",
            "a": "The cross-link increases conformational flexibility of the template, allowing the 5' template nucleotide to slip into the polymerase active site and direct insertion opposite the adducted AP site, producing context-dependent mutations."
        },
        {
            "q": "Should I worry about HMCES in my cell extract lesion-bypass assay?",
            "a": "Yes. Any extract or lysate containing HMCES will form thiazolidine cross-links to true abasic sites in ssDNA, altering polymerase readouts compared with a synthetic THF or dSpacer mimic that cannot be cross-linkable."
        }
    ],
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            "headline": "Why your AP-site DNA templates slip when you least expect it",
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            "description": "HMCES cross-links to AP sites in single-stranded DNA, and that cross-link drives the biology. Even trimmed by SPRTN to a five-amino-acid peptide, it still acts."
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                    "@type": "Question",
                    "name": "Does trimming HMCES off the AP site make bypass cleaner?",
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                        "text": "No. In Xenopus egg extracts, mutagenicity of HMCES-DPC bypass is insensitive to how much SPRTN has proteolyzed the cross-link; only cross-link formation itself matters, because it locks the AP site in a dynamic ring-opened state."
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                    "@type": "Question",
                    "name": "Why does the base 5' of the AP site change the mutation spectrum?",
                    "acceptedAnswer": {
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                        "text": "The cross-link increases conformational flexibility of the template, allowing the 5' template nucleotide to slip into the polymerase active site and direct insertion opposite the adducted AP site, producing context-dependent mutations."
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                    "@type": "Question",
                    "name": "Should I worry about HMCES in my cell extract lesion-bypass assay?",
                    "acceptedAnswer": {
                        "@type": "Answer",
                        "text": "Yes. Any extract or lysate containing HMCES will form thiazolidine cross-links to true abasic sites in ssDNA, altering polymerase readouts compared with a synthetic THF or dSpacer mimic that cannot be cross-linkable."
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        "published": "2026-08-17",
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