Component of the eisosome required for proper eisosome assembly%3B similar to Uso1p%3B authentic%2C non-tagged protein is detected in a phosphorylated state in highly purified mitochondria in high-throughput studies%3B protein increases in abundance and relocalizes from plasma membrane to cytoplasm upon DNA replication stress%3B EIS1 has a paralog%2C YKL050C%2C that arose from the whole genome duplication