Histones H1 are necessary for the condensation of nucleosome chains into higher-order structures. SAMP H1 has antibacterial activity against Gram-negative bacteria E.coli, A.salmonicida subsp salmonicida, V.anguillarum and S.typhimurium and Gram-positive bacteria B.subtilis and L.ivanovii. Belongs to the histone H1/H5 family.