Using iPALM to determine protein organisation in cardiac muscle Z-discs.

iPALM reveals distinct 3D organization of key Z-disc proteins in Zygaena filipendulae cardiac muscle with sub-10nm precision.

• Why it matters: Understanding the precise arrangement of Z-disc proteins is crucial for insights into cardiac signaling and disease mechanisms, yet their detailed organization remains unclear.
• What they did: Researchers labeled ZASP, α-actinin-2, and Z1Z2 titin epitope in cardiac myofibrils using specific Adhirons and employed interferometric photoactivated localization microscopy (iPALM) combined with PERPL analysis to map their 3D positions.
• The result: The study found that ZASP and α-actinin-2 share similar repeating patterns, whereas Z1Z2 exhibits a different organization, advancing knowledge of Z-disc architecture and its functional implications.