HEAT repeat
An example of an alpha solenoid structure composed of 15 HEAT repeats. The protein phosphatase 2A regulatory subunit is shown with the N-terminus in blue at bottom and the C-terminus in red at top. A single helix-turn-helix motif is shown in the center with the outer helix in pink, the inner helix in green, and the turn in white. From PDB: 2IAE​.[1][2]
Identifiers
SymbolHEAT
PfamPF02985
InterProIPR000357
PROSITEPDOC50077
SCOP21b3u / SCOPe / SUPFAM
Available protein structures:
Pfam  structures / ECOD  
PDBRCSB PDB; PDBe; PDBj
PDBsumstructure summary
PDB1b3u​, 1f59​, 1gcj​, 1ibr​, 1m5n​, 1o6o​, 1o6p​, 1qbk​, 1qgr​, 1u6g​, 1ukl​, 2bku​

A HEAT repeat is a protein tandem repeat structural motif composed of two alpha helices linked by a short loop. HEAT repeats can form alpha solenoids, a type of solenoid protein domain found in a number of cytoplasmic proteins. The name "HEAT" is an acronym for four proteins in which this repeat structure is found: Huntingtin, elongation factor 3 (EF3), protein phosphatase 2A (PP2A),[3] and the yeast kinase TOR1.[4] HEAT repeats form extended superhelical structures which are often involved in intracellular transport; they are structurally related to armadillo repeats. The nuclear transport protein importin beta contains 19 HEAT repeats.

Various HEAT repeat proteins and their structures

Representative examples of HEAT repeat proteins include importin β (also known as karyopherin β) family,[5] regulatory subunits of condensin and cohesin,[6] separase,[7] PIKKs (phosphatidylinositol 3-kinase-related protein kinases) such as ATM (Ataxia telangiectasia mutated) and ATR (Ataxia telangiectasia and Rad3 related),[8][9] and the microtubule-binding protein XMAP215/Dis1/TOG[10] and CLASP.[11] Thus, cellular functions of HEAT repeat proteins are highly variable.

The structure of the following HEAT repeat proteins have been determined so far:

References

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External links

Protein tandem repeats
Category