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NHL repeat
The NHL repeat, named after NCL-1, HT2A and Lin-41, is an amino acid sequence found largely in a large number of eukaryotic and prokaryotic proteins. For example, the repeat is found in a variety of enzymes of the copper type II, ascorbate-dependent monooxygenase family which catalyse the C-terminus alpha-amidation of biological peptides. In many it occurs in tandem arrays, for example in the RING finger beta-box, coiled-coil (RBCC) eukaryotic growth regulators. The 'Brain Tumor' protein (Brat) is one such growth regulator that contains a 6-bladed NHL-repeat beta-propeller.〔 The NHL repeats are also found in serine/threonine protein kinase (STPK) in diverse range of pathogenic bacteria. These STPK are transmembrane receptors with an intracellular N-terminal kinase domain and extracellular C-terminal sensor domain. In the STPK, PknD, from Mycobacterium tuberculosis, the sensor domain forms a rigid, six-bladed b-propeller composed of NHL repeats with a flexible tether to the transmembrane domain. == References ==
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