Table 3. Comparison of amino-acid composition.

	Mesophiles and nonhalophiles†		Thermophiles†		Halophiles†		Halothermophile (H. orenii GH43 glycosidase‡)
Amino-acid class§ (%)	Interior	Surface	Interior	Surface	Interior	Surface	Interior	Surface
Apolar	45.6	18.1	46.9	20.2	41.5	15.1	39.2	25.0
Polar	15.3	21.0	13.4	15.6	14.9	17.5	19.8	21.0
Basic	6.0	16.7	7.1	20.1	5.8	10.9	3.3	20.0
Acidic	7.2	21.0	7.8	23.0	8.6	28.6	6.6	23.0
Other	25.9	3.1	24.8	21.1	29.1	28.0	31.1	11.0

^†Values from Fukuchi et al. (2003 ▶).

^‡Values that are different in the H. orenii GH43 enzyme with respect to the other groups are highlighted in bold.

^§Classification: apolar, Val, Ile, Leu, Met, Phe, Trp, Tyr; polar, Asn, Gln, Ser, Thr; basic, Lys, Arg; acidic, Asp, Glu; other, Ala, Cys, Gly, Pro, His.