Esterase that may be involved in cell wall biosynthesis and/or maintenance. Hydrolyzes pNP-butyrate (C4). a butanoate ester + H2O = an aliphatic alcohol + butanoate + H(+) Inhibited by tetrahydrolipstatin (THL), a specific lipase inhibitor. kcat is 0.146 sec(-1) with pNP-butyrate as substrate. Belongs to the cutinase family.