Amino acid dipepetide frequency for Streptomyces sp.

Apart from single amino acid frequencies one can also calculate so called amino acid dipeptide frequency.

There is 400 possibilites (441 if we consider Xaa as additional 21st amino acid representing all non-standard or unknown amino acids). Thus, if the dipeptides would be present randomly in proteins each amino acid dipeptide should be present with 0.25% frequency. As it is not the case in the nature, for better visablity all more than expected dipepetides are marked by red, and those which are underrepresented are marked by blue in the table.

All values are presented as per milles (‰), therefore need to be multiplied by 10^-3.

	Ala	Cys	Asp	Glu	Phe	Gly	His	Ile	Lys	Leu	Met	Asn	Pro	Gln	Arg	Ser	Thr	Val	Trp	Tyr	Xaa
Ala	18.66	1.12	8.24	8.81	3.70	12.89	2.98	3.78	3.30	14.91	2.68	2.09	7.23	4.09	10.00	6.20	7.10	12.18	1.89	2.86	0.00
Cys	1.13	0.09	0.46	0.41	0.24	0.99	0.20	0.20	0.14	0.79	0.14	0.16	0.50	0.19	0.62	0.49	0.54	0.68	0.14	0.16	0.00
Asp	7.67	0.43	3.18	3.75	1.73	6.06	1.42	1.90	1.33	6.09	0.79	1.02	4.34	1.68	4.60	2.60	3.06	4.51	1.04	1.13	0.00
Glu	7.33	0.39	2.61	3.14	1.52	4.17	1.49	2.23	1.34	7.13	0.88	0.99	3.20	2.29	5.28	2.64	2.70	4.31	0.77	1.11	0.00
Phe	3.91	0.30	1.97	1.44	0.91	3.10	0.65	0.82	0.60	2.66	0.43	0.62	1.45	0.75	1.79	1.53	2.11	2.26	0.43	0.61	0.00
Gly	11.09	0.90	4.96	5.03	2.96	7.81	2.43	3.72	2.62	9.54	2.00	1.83	5.11	2.90	7.55	5.45	6.04	7.34	1.81	2.31	0.00
His	2.69	0.23	1.35	1.25	0.70	2.39	0.69	0.76	0.40	2.49	0.37	0.39	1.84	0.73	2.06	1.10	1.41	1.70	0.38	0.53	0.00
Ile	5.15	0.33	2.31	2.08	0.74	3.77	0.68	0.88	0.82	2.60	0.47	0.77	1.90	0.82	2.27	1.81	2.33	2.78	0.43	0.58	0.00
Lys	3.22	0.13	1.47	1.24	0.52	1.97	0.49	0.93	0.89	2.24	0.45	0.59	1.49	0.79	1.49	1.35	1.39	2.04	0.32	0.49	0.00
Leu	15.79	0.89	6.82	4.53	2.74	9.58	2.38	3.53	2.23	10.36	1.77	1.91	6.56	2.33	8.38	5.53	6.85	8.83	1.34	1.93	0.00
Met	2.38	0.16	0.93	0.79	0.47	1.40	0.38	0.69	0.45	1.81	0.32	0.44	1.21	0.47	1.48	1.30	1.46	1.36	0.24	0.35	0.00
Asn	2.34	0.19	0.98	0.82	0.52	2.05	0.43	0.70	0.48	1.73	0.35	0.46	1.41	0.58	1.29	1.06	1.25	1.43	0.33	0.43	0.00
Pro	8.69	0.38	4.32	4.12	1.54	6.51	1.39	1.35	1.35	5.43	1.04	1.01	3.16	1.97	3.73	3.31	3.14	5.57	0.91	1.45	0.00
Gln	3.93	0.20	1.53	1.47	0.76	2.47	0.75	1.17	0.71	3.49	0.53	0.57	1.78	1.30	2.47	1.40	1.32	2.44	0.50	0.69	0.00
Arg	9.61	0.58	4.04	4.54	2.31	5.72	2.03	3.37	1.70	8.48	1.71	1.36	4.79	2.32	6.56	3.95	5.36	5.46	1.37	1.73	0.00
Ser	7.10	0.45	2.70	2.35	1.61	6.05	1.09	1.61	1.13	5.11	1.15	0.96	3.29	1.35	3.55	2.86	3.17	4.44	0.99	1.31	0.00
Thr	8.73	0.41	3.41	3.12	1.68	6.59	1.23	1.81	1.27	5.78	0.99	1.07	4.05	1.44	3.76	3.28	3.47	5.97	0.92	1.43	0.00
Val	10.67	0.74	4.75	4.58	2.47	6.40	1.97	2.97	1.89	9.59	1.45	1.74	5.13	2.17	6.99	4.41	5.44	7.13	1.07	1.58	0.00
Trp	1.72	0.17	0.83	0.71	0.53	1.09	0.39	0.59	0.41	1.89	0.30	0.43	0.82	0.67	1.31	0.97	1.05	0.99	0.35	0.38	0.00
Tyr	2.91	0.19	1.45	1.30	0.71	2.39	0.40	0.51	0.45	2.16	0.27	0.44	1.10	0.65	1.80	1.02	1.20	1.72	0.38	0.45	0.00
Xaa	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00

Statistics based on 7,414 proteins (major isoforms only; 2,319,158 amino acids)

Proteome-pI is available under Creative Commons Attribution-NoDerivs license, for more details see here