Soluble lytic murein transglycosylase (SLT) consists of three domains, an N-terminal U domain, an L domain (linker domain) and a C-terminal domain (C). The L domain may be involved in the interaction of the enzyme with peptidoglycan [1].

1: High resolution crystal structures of the Escherichia coli lytic transglycosylase Slt70 and its complex with a peptidoglycan fragment. van Asselt EJ, Thunnissen AM, Dijkstra BW; J Mol Biol. 1999;291:877-898. PMID:10452894