Plasmid Map: Features, Orientation, and Coordinate Checks

Use a plasmid map maker to communicate the features you already know: replication origin, selectable marker, promoter and insert. Supply authoritative annotations for a real construct. This tool drafts a visual map; it does not parse sequences, discover restriction sites or validate an assembly.

Use the Plasmid Map Maker to start a draft, then check it against the reference points below.

Original AI-generated plasmid map reference commissioned by AcaDraw. Fictional annotations without verified sequence coordinates.

A plasmid map is an annotation view

A circular map summarizes where features occur along a DNA molecule. For a real construct, its authority comes from the associated sequence record, not from the circle or the colors. An introductory diagram can explain the origin, marker and insert without claiming exact positions.

The reference here is explicitly fictional. Its features have no measured lengths or base-pair coordinates. Use it to explain vocabulary; use a validated sequence record when the diagram will inform cloning or construct documentation.

Orientation and coordinates answer different questions

Orientation tells a reader which direction a feature is represented on the molecule. Coordinates locate the feature relative to an origin and a stated numbering convention. A feature crossing the origin can appear split even though it is continuous in the circular molecule.

For a real map, provide total construct length, each start and end position and the annotation convention. A promoter pointing toward a coding feature is useful to show, but expression also depends on sequence and biological context.

A review list for a real construct

Before sharing a map of an actual plasmid, compare feature names, orientation and coordinates with the sequence editor. Confirm the selectable marker and host context from the vector documentation. Keep insert junctions and reading-frame questions in sequence-aware tools.

Do not add restriction sites based on a familiar-looking vector or infer them from spacing in an AI image. If the diagram is only conceptual, omit those details and label the scope clearly rather than giving the impression of sequence validation.

Plasmid Map reference key

A brief for the visual draft

Checks before sharing

Invented coordinates. Never turn visually estimated feature positions into base-pair annotations.

Promoter direction ignored. A nearby promoter is not automatically aligned with the intended coding feature.

Map mistaken for sequence evidence. A polished circle does not establish construct identity, function or experimental safety.

Common questions

Can the plasmid map maker read a DNA sequence?

This page drafts a visual from your description and annotations. It does not parse FASTA or GenBank files or identify sequence features.

Can I show real base-pair coordinates?

Yes, if you provide verified coordinates, total length and the coordinate convention. Check the resulting labels against your sequence editor.

What do the feature arrows mean?

They can represent feature orientation or strand, depending on the legend. They do not imply a reaction flow.

Does it find restriction sites?

No. Restriction-site discovery and assembly validation require sequence-aware tools.

Sources and editorial notes

• Addgene: Plasmid Background
• Addgene: Plasmids 101

Prepared by the AcaDraw product team on November 10, 2026. The illustration is an original AI-generated teaching example. Reference links support the concepts; they do not imply endorsement or independent review of this article.