FK phages have two very large genes (>1400bp, >460 amino acids) found upstream of the tape measure (REF phage Elver genes 36 and 37). These proteins both have a very small HHpred hit (<50 amino acids) to PDB 2C3F_A: HYALURONIDASE, PHAGE ASSOCIATED; LYASE, HYALURONAN LYASE, PHAGE TAIL FIBRE from a streptococcal phage. There are no hits to Mycobacterial phage Bxb1 tail proteins. However, pham members for Elver 37 are found in AP1 phages in canonical locations downstream of the tape measure. Thus, a minor tail call appears supported.
RS Pollenz