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Description:
PERKs are proline-rich extensin-like receptor kinases that constitute a small RLK family containing an extracellular proline-rich domain. Studies on the functions of PERKs are rare, but most suggest that PERKs regulate mainly plant growth and development (Invernizzi et al., 2022). Since no hidden Markov model (HMM) could be used for the PERK classification, RLKs are first classified into different families with HMMs and the remain unclassified RLKs were clustered by protein sequence similarity.

References:
1. Invernizzi M, Hanemian M, Keller J, Libourel C, Roby D. PERKing up our understanding of the proline-rich extensin-like receptor kinases, a forgotten plant receptor kinase family. 2022. New Phytol. 235(3):875-884. doi: 10.1111/nph.18166. PMID: 35451507.